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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Linus Torvaldsbfeffd12019-01-06 17:08:20 -08002VERSION = 5
Linus Torvaldsb3a9e3b2020-06-14 12:45:04 -07003PATCHLEVEL = 8
Linus Torvalds55922c92011-05-29 17:43:36 -07004SUBLEVEL = 0
Linus Torvalds92ed3012020-07-26 14:14:06 -07005EXTRAVERSION = -rc7
Linus Torvaldsd6d5df12019-10-27 13:19:19 -04006NAME = Kleptomaniac Octopus
Linus Torvalds1da177e2005-04-16 15:20:36 -07007
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
Masahiro Yamada121c2a12020-05-11 12:50:13 +090014$(if $(filter __%, $(MAKECMDGOALS)), \
15 $(error targets prefixed with '__' are only for internal use))
16
Masahiro Yamadaba634ec2017-10-04 12:56:05 +090017# That's our default target when none is given on the command line
Masahiro Yamada121c2a12020-05-11 12:50:13 +090018PHONY := __all
19__all:
Masahiro Yamadaba634ec2017-10-04 12:56:05 +090020
Linus Torvalds1da177e2005-04-16 15:20:36 -070021# We are using a recursive build, so we need to do a little thinking
22# to get the ordering right.
23#
24# Most importantly: sub-Makefiles should only ever modify files in
25# their own directory. If in some directory we have a dependency on
26# a file in another dir (which doesn't happen often, but it's often
Nicholas Pigginf49821e2018-02-11 00:25:04 +100027# unavoidable when linking the built-in.a targets which finally
Linus Torvalds1da177e2005-04-16 15:20:36 -070028# turn into vmlinux), we will call a sub make in that other dir, and
29# after that we are sure that everything which is in that other dir
30# is now up to date.
31#
32# The only cases where we need to modify files which have global
33# effects are thus separated out and done before the recursive
34# descending is started. They are now explicitly listed as the
35# prepare rule.
36
Masahiro Yamada221cc2d2019-03-26 13:02:19 +090037ifneq ($(sub_make_done),1)
Masahiro Yamada3812b8c2019-02-22 16:40:07 +090038
39# Do not use make's built-in rules and variables
40# (this increases performance and avoids hard-to-debug behaviour)
41MAKEFLAGS += -rR
42
43# Avoid funny character set dependencies
44unexport LC_ALL
45LC_COLLATE=C
46LC_NUMERIC=C
47export LC_COLLATE LC_NUMERIC
48
49# Avoid interference with shell env settings
50unexport GREP_OPTIONS
51
Michal Marek066b7ed2014-07-04 14:29:30 +020052# Beautify output
53# ---------------------------------------------------------------------------
54#
55# Normally, we echo the whole command before executing it. By making
56# that echo $($(quiet)$(cmd)), we now have the possibility to set
57# $(quiet) to choose other forms of output instead, e.g.
58#
59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
61#
62# If $(quiet) is empty, the whole command will be printed.
63# If it is set to "quiet_", only the short version will be printed.
64# If it is set to "silent_", nothing will be printed at all, since
65# the variable $(silent_cmd_cc_o_c) doesn't exist.
66#
67# A simple variant is to prefix commands with $(Q) - that's useful
68# for commands that shall be hidden in non-verbose mode.
69#
70# $(Q)ln $@ :<
71#
72# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73# If KBUILD_VERBOSE equals 1 then the above command is displayed.
Randy Dunlap505b12b2020-02-12 20:40:57 -080074# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
Michal Marek066b7ed2014-07-04 14:29:30 +020075#
Linus Torvalds1da177e2005-04-16 15:20:36 -070076# To put more focus on warnings, be less verbose as default
77# Use 'make V=1' to see the full commands
78
Cheng Renquanb8b06182009-05-26 16:03:07 +080079ifeq ("$(origin V)", "command line")
80 KBUILD_VERBOSE = $(V)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081endif
82ifndef KBUILD_VERBOSE
83 KBUILD_VERBOSE = 0
84endif
85
Michal Marek066b7ed2014-07-04 14:29:30 +020086ifeq ($(KBUILD_VERBOSE),1)
87 quiet =
88 Q =
89else
90 quiet=quiet_
91 Q = @
92endif
93
94# If the user is running make -s (silent mode), suppress echoing of
95# commands
96
Masahiro Yamada6f0fa582017-05-19 20:42:30 +090097ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
Michal Marek066b7ed2014-07-04 14:29:30 +020098 quiet=silent_
99endif
Michal Marek066b7ed2014-07-04 14:29:30 +0200100
101export quiet Q KBUILD_VERBOSE
102
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900103# Kbuild will save output files in the current working directory.
104# This does not need to match to the root of the kernel source tree.
105#
106# For example, you can do this:
107#
108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
109#
110# If you want to save output files in a different location, there are
111# two syntaxes to specify it.
112#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113# 1) O=
114# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200115#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116# 2) Set KBUILD_OUTPUT
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900117# Set the environment variable KBUILD_OUTPUT to point to the output directory.
118# export KBUILD_OUTPUT=dir/to/store/output/files/; make
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119#
120# The O= assignment takes precedence over the KBUILD_OUTPUT environment
121# variable.
122
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900123# Do we want to change the working directory?
Cheng Renquanb8b06182009-05-26 16:03:07 +0800124ifeq ("$(origin O)", "command line")
125 KBUILD_OUTPUT := $(O)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126endif
127
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900128ifneq ($(KBUILD_OUTPUT),)
129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
130# expand a shell special character '~'. We use a somewhat tedious way here.
131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
132$(if $(abs_objtree),, \
133 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
134
135# $(realpath ...) resolves symlinks
136abs_objtree := $(realpath $(abs_objtree))
137else
138abs_objtree := $(CURDIR)
139endif # ifneq ($(KBUILD_OUTPUT),)
140
141ifeq ($(abs_objtree),$(CURDIR))
142# Suppress "Entering directory ..." unless we are changing the work directory.
143MAKEFLAGS += --no-print-directory
144else
145need-sub-make := 1
Robert Jarzmik51193b72016-04-02 21:38:53 +0200146endif
147
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900150ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
151$(error source directory cannot contain spaces or colons)
152endif
153
154ifneq ($(abs_srctree),$(abs_objtree))
Masahiro Yamada80463f12018-09-14 15:33:23 +0900155# Look for make include files relative to root of kernel src
156#
157# This does not become effective immediately because MAKEFLAGS is re-parsed
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900158# once after the Makefile is read. We need to invoke sub-make.
159MAKEFLAGS += --include-dir=$(abs_srctree)
Masahiro Yamada688931a2019-03-19 13:02:36 +0900160need-sub-make := 1
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900161endif
Masahiro Yamada3812b8c2019-02-22 16:40:07 +0900162
Masahiro Yamada93fdddf2020-05-11 12:50:12 +0900163this-makefile := $(lastword $(MAKEFILE_LIST))
164
Masahiro Yamada688931a2019-03-19 13:02:36 +0900165ifneq ($(filter 3.%,$(MAKE_VERSION)),)
166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
167# We need to invoke sub-make to avoid implicit rules in the top Makefile.
168need-sub-make := 1
169# Cancel implicit rules for this Makefile.
Masahiro Yamada93fdddf2020-05-11 12:50:12 +0900170$(this-makefile): ;
Masahiro Yamada688931a2019-03-19 13:02:36 +0900171endif
172
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900173export abs_srctree abs_objtree
Masahiro Yamada221cc2d2019-03-26 13:02:19 +0900174export sub_make_done := 1
175
Masahiro Yamada688931a2019-03-19 13:02:36 +0900176ifeq ($(need-sub-make),1)
177
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900178PHONY += $(MAKECMDGOALS) __sub-make
Milton Miller0b357862007-09-21 18:09:02 -0500179
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
Charles Keepax16f89092012-10-15 13:49:12 +0100181 @:
Milton Miller0b357862007-09-21 18:09:02 -0500182
Cao jinc4e6fff2017-06-30 10:45:43 +0800183# Invoke a second make in the output directory, passing relevant variables
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900184__sub-make:
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Masahiro Yamada688931a2019-03-19 13:02:36 +0900187endif # need-sub-make
Masahiro Yamada221cc2d2019-03-26 13:02:19 +0900188endif # sub_make_done
Masahiro Yamada688931a2019-03-19 13:02:36 +0900189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190# We process the rest of the Makefile if this is the final invocation of make
Masahiro Yamada688931a2019-03-19 13:02:36 +0900191ifeq ($(need-sub-make),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Masahiro Yamada7ff52572014-09-09 20:02:22 +0900193# Do not print "Entering directory ...",
194# but we want to display it when entering to the output directory
195# so that IDEs/editors are able to understand relative filenames.
196MAKEFLAGS += --no-print-directory
197
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900198# Call a source code checker (by default, "sparse") as part of the
199# C compilation.
200#
201# Use 'make C=1' to enable checking of only re-compiled files.
202# Use 'make C=2' to enable checking of *all* source files, regardless
203# of whether they are re-compiled or not.
204#
Cao jin036db112017-03-24 17:03:17 +0800205# See the file "Documentation/dev-tools/sparse.rst" for more details,
206# including where to get the "sparse" utility.
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900207
208ifeq ("$(origin C)", "command line")
209 KBUILD_CHECKSRC = $(C)
210endif
211ifndef KBUILD_CHECKSRC
212 KBUILD_CHECKSRC = 0
213endif
214
Masahiro Yamada7e35b422019-09-21 16:05:41 +0900215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
216# directory of external module to build. Setting M= takes precedence.
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900217ifeq ("$(origin M)", "command line")
218 KBUILD_EXTMOD := $(M)
219endif
220
Masahiro Yamadae9e81b62020-05-25 00:42:15 +0900221$(if $(word 2, $(KBUILD_EXTMOD)), \
222 $(error building multiple external modules is not supported))
223
Masahiro Yamada051f2782019-07-06 12:07:12 +0900224export KBUILD_CHECKSRC KBUILD_EXTMOD
225
Masahiro Yamada394053f2019-08-15 00:19:18 +0900226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
227
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900228ifeq ($(abs_srctree),$(abs_objtree))
Michal Marek9da07632014-04-25 23:25:18 +0200229 # building in the source tree
230 srctree := .
Masahiro Yamada051f2782019-07-06 12:07:12 +0900231 building_out_of_srctree :=
Michal Marek9da07632014-04-25 23:25:18 +0200232else
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
Michal Marek9da07632014-04-25 23:25:18 +0200234 # building in a subdirectory of the source tree
235 srctree := ..
236 else
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900237 srctree := $(abs_srctree)
Michal Marek9da07632014-04-25 23:25:18 +0200238 endif
Masahiro Yamada051f2782019-07-06 12:07:12 +0900239 building_out_of_srctree := 1
Michal Marek9da07632014-04-25 23:25:18 +0200240endif
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900241
Masahiro Yamada95fd3f82019-07-06 12:07:13 +0900242ifneq ($(KBUILD_ABS_SRCTREE),)
243srctree := $(abs_srctree)
244endif
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900245
Michal Marek7e1c0472014-04-25 17:29:45 +0200246objtree := .
Masahiro Yamada6b12de62019-02-22 16:40:09 +0900247VPATH := $(srctree)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
Masahiro Yamada051f2782019-07-06 12:07:12 +0900249export building_out_of_srctree srctree objtree VPATH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900251# To make sure we do not include .config for any of the *config targets
252# catch them early, and hand them over to scripts/kconfig/Makefile
253# It is allowed to specify more targets when calling make, including
254# mixing *config targets and build targets.
255# For example 'make oldconfig all'.
256# Detect when mixed targets is specified, and make a second invocation
257# of make so .config is not included in this case either (for *config).
258
259version_h := include/generated/uapi/linux/version.h
260old_version_h := include/linux/version.h
261
Masahiro Yamada22340a02018-02-11 17:40:29 +0900262clean-targets := %clean mrproper cleandocs
263no-dot-config-targets := $(clean-targets) \
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900264 cscope gtags TAGS tags help% %docs check% coccicheck \
Masahiro Yamada59b2bd02019-06-04 19:14:02 +0900265 $(version_h) headers headers_% archheaders archscripts \
David Engraf46239802020-03-26 20:29:33 +0100266 %asm-generic kernelversion %src-pkg dt_binding_check \
267 outputmakefile
Masahiro Yamadaa29d4d82018-07-20 16:46:35 +0900268no-sync-config-targets := $(no-dot-config-targets) install %install \
269 kernelrelease
Masahiro Yamada394053f2019-08-15 00:19:18 +0900270single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900271
Masahiro Yamada2042b542019-08-11 00:53:03 +0900272config-build :=
273mixed-build :=
274need-config := 1
275may-sync-config := 1
Masahiro Yamada394053f2019-08-15 00:19:18 +0900276single-build :=
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900277
278ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
279 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900280 need-config :=
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900281 endif
282endif
283
Masahiro Yamadad7942412018-07-20 16:46:34 +0900284ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
285 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900286 may-sync-config :=
Masahiro Yamadad7942412018-07-20 16:46:34 +0900287 endif
288endif
289
290ifneq ($(KBUILD_EXTMOD),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900291 may-sync-config :=
Masahiro Yamadad7942412018-07-20 16:46:34 +0900292endif
293
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900294ifeq ($(KBUILD_EXTMOD),)
295 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900296 config-build := 1
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900297 ifneq ($(words $(MAKECMDGOALS)),1)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900298 mixed-build := 1
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900299 endif
300 endif
301endif
Masahiro Yamada22340a02018-02-11 17:40:29 +0900302
Masahiro Yamada394053f2019-08-15 00:19:18 +0900303# We cannot build single targets and the others at the same time
304ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
305 single-build := 1
306 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
307 mixed-build := 1
308 endif
309endif
310
Masahiro Yamada22340a02018-02-11 17:40:29 +0900311# For "make -j clean all", "make -j mrproper defconfig all", etc.
312ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
313 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900314 mixed-build := 1
Masahiro Yamada22340a02018-02-11 17:40:29 +0900315 endif
316endif
317
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900318# install and modules_install need also be processed one by one
319ifneq ($(filter install,$(MAKECMDGOALS)),)
320 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900321 mixed-build := 1
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900322 endif
323endif
324
Masahiro Yamada2042b542019-08-11 00:53:03 +0900325ifdef mixed-build
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900326# ===========================================================================
327# We're called with mixed targets (*config and build targets).
328# Handle them one by one.
329
330PHONY += $(MAKECMDGOALS) __build_one_by_one
331
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900332$(MAKECMDGOALS): __build_one_by_one
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900333 @:
334
335__build_one_by_one:
336 $(Q)set -e; \
337 for i in $(MAKECMDGOALS); do \
338 $(MAKE) -f $(srctree)/Makefile $$i; \
339 done
340
Masahiro Yamada2042b542019-08-11 00:53:03 +0900341else # !mixed-build
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900342
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900343include scripts/Kbuild.include
344
345# Read KERNELRELEASE from include/config/kernel.release (if it exists)
346KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
347KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
348export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
349
Anders Roxellb2d35fa2018-09-04 12:47:21 +0200350include scripts/subarch.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
352# Cross compiling and selecting different set of gcc/bin-utils
353# ---------------------------------------------------------------------------
354#
355# When performing cross compilation for other architectures ARCH shall be set
356# to the target architecture. (See arch/* for the possibilities).
357# ARCH can be set during invocation of make:
358# make ARCH=ia64
359# Another way is to have ARCH set in the environment.
360# The default ARCH is the host where make is executed.
361
362# CROSS_COMPILE specify the prefix used for all executables used
363# during compilation. Only gcc and related bin-utils executables
364# are prefixed with $(CROSS_COMPILE).
365# CROSS_COMPILE can be set on the command line
366# make CROSS_COMPILE=ia64-linux-
367# Alternatively CROSS_COMPILE can be set in the environment.
368# Default value for CROSS_COMPILE is not to prefix executables
369# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Sam Ravnborg2331d1a2009-10-11 23:22:58 +0200370ARCH ?= $(SUBARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200373UTS_MACHINE := $(ARCH)
374SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
Sam Ravnborgd746d642007-11-12 20:14:19 +0100376# Additional ARCH settings for x86
377ifeq ($(ARCH),i386)
378 SRCARCH := x86
379endif
380ifeq ($(ARCH),x86_64)
381 SRCARCH := x86
382endif
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200383
Sam Ravnborg5e538792008-12-02 23:17:12 -0800384# Additional ARCH settings for sparc
Namhyung Kime69f58c2010-10-25 05:48:23 +0000385ifeq ($(ARCH),sparc32)
386 SRCARCH := sparc
387endif
Sam Ravnborga439fe52008-07-27 23:00:59 +0200388ifeq ($(ARCH),sparc64)
Sam Ravnborg5e538792008-12-02 23:17:12 -0800389 SRCARCH := sparc
Sam Ravnborga439fe52008-07-27 23:00:59 +0200390endif
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200391
Paul Mundt3cc000b2009-04-11 08:39:27 +0900392# Additional ARCH settings for sh
393ifeq ($(ARCH),sh64)
394 SRCARCH := sh
395endif
396
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700397KCONFIG_CONFIG ?= .config
Ben Gardiner41263fc2010-12-14 11:39:44 -0500398export KCONFIG_CONFIG
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700399
Masahiro Yamada2a86f662020-02-28 12:46:40 +0900400# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
401export KBUILD_DEFCONFIG := defconfig
402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403# SHELL used by kbuild
Masahiro Yamada858805b2019-08-25 22:28:37 +0900404CONFIG_SHELL := sh
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Masahiro Yamada6d79a7b2018-07-12 19:38:36 +0900406HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
407HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
408HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200409
Masahiro Yamadaa0d1c952020-04-08 10:36:23 +0900410ifneq ($(LLVM),)
411HOSTCC = clang
412HOSTCXX = clang++
413else
414HOSTCC = gcc
415HOSTCXX = g++
416endif
Masahiro Yamada7f3a59d2020-04-29 12:45:14 +0900417
418export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
419 -O2 -fomit-frame-pointer -std=gnu89
420export KBUILD_USERLDFLAGS :=
421
422KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
Masahiro Yamada735aab12020-03-25 12:14:32 +0900423KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
Laura Abbottf92d19e2018-07-09 17:46:02 -0700424KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
425KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428CPP = $(CC) -E
Masahiro Yamadaa0d1c952020-04-08 10:36:23 +0900429ifneq ($(LLVM),)
430CC = clang
431LD = ld.lld
432AR = llvm-ar
433NM = llvm-nm
434OBJCOPY = llvm-objcopy
435OBJDUMP = llvm-objdump
436READELF = llvm-readelf
437OBJSIZE = llvm-size
438STRIP = llvm-strip
439else
440CC = $(CROSS_COMPILE)gcc
441LD = $(CROSS_COMPILE)ld
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442AR = $(CROSS_COMPILE)ar
443NM = $(CROSS_COMPILE)nm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444OBJCOPY = $(CROSS_COMPILE)objcopy
445OBJDUMP = $(CROSS_COMPILE)objdump
Dmitry Golovineefb8c12019-12-05 00:54:41 +0200446READELF = $(CROSS_COMPILE)readelf
Masahiro Yamadaa0d1c952020-04-08 10:36:23 +0900447OBJSIZE = $(CROSS_COMPILE)size
448STRIP = $(CROSS_COMPILE)strip
449endif
Andrii Nakryikoe83b9f52019-04-02 09:49:50 -0700450PAHOLE = pahole
Masahiro Yamada73a4f6d2017-12-10 01:02:28 +0900451LEX = flex
452YACC = bison
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453AWK = awk
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200454INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900457PYTHON = python
Masahiro Yamadae9781b52018-03-13 18:12:02 +0900458PYTHON3 = python3
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459CHECK = sparse
Masahiro Yamada858805b2019-08-25 22:28:37 +0900460BASH = bash
Denis Efremove4a42c82020-06-08 12:59:44 +0300461KGZIP = gzip
462KBZIP2 = bzip2
463KLZOP = lzop
Denis Efremov8dfb61d2020-06-05 10:39:55 +0300464LZMA = lzma
465LZ4 = lz4c
466XZ = xz
Nick Terrell48f7ddf2020-07-30 12:08:36 -0700467ZSTD = zstd
Denis Efremov8dfb61d2020-06-05 10:39:55 +0300468
Hannes Eder80a7d1d2008-12-27 22:38:44 +0100469CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
Luc Van Oostenryck6c49f352018-02-15 22:07:50 +0100470 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
Douglas Anderson0c22be02019-03-14 16:41:59 -0700471NOSTDINC_FLAGS :=
Sam Ravnborg65881692010-07-28 17:33:09 +0200472CFLAGS_MODULE =
473AFLAGS_MODULE =
474LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475CFLAGS_KERNEL =
476AFLAGS_KERNEL =
Michal Marekb36fad62016-06-07 11:57:02 +0200477LDFLAGS_vmlinux =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
David Howellsabbf1592012-10-02 18:01:26 +0100479# Use USERINCLUDE when you must reference the UAPI directories only.
480USERINCLUDE := \
Masahiro Yamada9d022c52017-10-04 12:56:04 +0900481 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
482 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100483 -I$(srctree)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200484 -I$(objtree)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100485 -include $(srctree)/include/linux/kconfig.h
486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487# Use LINUXINCLUDE when you must reference the include/ directory.
488# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100489LINUXINCLUDE := \
Masahiro Yamada9d022c52017-10-04 12:56:04 +0900490 -I$(srctree)/arch/$(SRCARCH)/include \
491 -I$(objtree)/arch/$(SRCARCH)/include/generated \
Masahiro Yamada051f2782019-07-06 12:07:12 +0900492 $(if $(building_out_of_srctree),-I$(srctree)/include) \
Masahiro Yamadaf8224f72017-06-06 16:15:28 +0900493 -I$(objtree)/include \
494 $(USERINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
Masahiro Yamada42a92bc2018-12-14 17:05:37 +0900496KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
Masahiro Yamadaeeb56872018-12-14 17:05:38 +0900497KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
Masahiro Yamada42a92bc2018-12-14 17:05:37 +0900498 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
Luc Van Oostenryckb89f25e2019-03-04 13:55:20 +0100499 -Werror=implicit-function-declaration -Werror=implicit-int \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300500 -Wno-format-security \
Masahiro Yamada433dc2e2017-10-12 18:22:25 +0900501 -std=gnu89
502KBUILD_CPPFLAGS := -D__KERNEL__
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200503KBUILD_AFLAGS_KERNEL :=
504KBUILD_CFLAGS_KERNEL :=
Sam Ravnborg65881692010-07-28 17:33:09 +0200505KBUILD_AFLAGS_MODULE := -DMODULE
506KBUILD_CFLAGS_MODULE := -DMODULE
Masahiro Yamada10df0632019-08-15 01:06:22 +0900507KBUILD_LDFLAGS_MODULE :=
508export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
Masahiro Yamadad503ac52018-08-24 08:20:39 +0900509KBUILD_LDFLAGS :=
Masahiro Yamada433dc2e2017-10-12 18:22:25 +0900510GCC_PLUGINS_CFLAGS :=
Masahiro Yamada5241ab4c2019-07-29 18:15:17 +0900511CLANG_FLAGS :=
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Masahiro Yamadaaa824e02020-03-26 14:57:18 +0900513export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
Dmitry Golovineefb8c12019-12-05 00:54:41 +0200514export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
Masahiro Yamada94f73452020-01-06 17:36:28 +0900515export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
Nick Terrell48f7ddf2020-07-30 12:08:36 -0700516export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
Vasily Gorbik7bac9872019-01-21 13:54:39 +0100517export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
Masahiro Yamadad503ac52018-08-24 08:20:39 +0900519export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
Andrey Konovalov0e410e12018-02-06 15:36:00 -0800520export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
Marco Elverdfd402a2019-11-14 19:02:54 +0100521export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN
Sam Ravnborg222d3942007-10-15 21:59:31 +0200522export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200523export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200524export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526# Files to ignore in find ... statements
527
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500528export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
529 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
530 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100531export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
532 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
534# ===========================================================================
535# Rules shared between *config targets and build targets
536
Cao jin312a3d02017-08-02 10:31:06 +0800537# Basic helpers built in scripts/basic/
Paul Smith4f193362006-03-05 17:14:10 -0500538PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539scripts_basic:
540 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500541 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Paul Smith4f193362006-03-05 17:14:10 -0500543PHONY += outputmakefile
Masahiro Yamadae8e83a22019-08-22 13:46:11 +0900544# Before starting out-of-tree build, make sure the source tree is clean.
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200545# outputmakefile generates a Makefile in the output directory, if using a
546# separate output directory. This allows convenient use of make in the
547# output directory.
Vladimir Kondratiev3a51ff32019-02-03 10:48:40 +0200548# At the same time when output Makefile generated, generate .gitignore to
549# ignore whole output directory
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550outputmakefile:
Masahiro Yamada051f2782019-07-06 12:07:12 +0900551ifdef building_out_of_srctree
Masahiro Yamadae8e83a22019-08-22 13:46:11 +0900552 $(Q)if [ -f $(srctree)/.config -o \
553 -d $(srctree)/include/config -o \
554 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
555 echo >&2 "***"; \
556 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
557 echo >&2 "*** in $(abs_srctree)";\
558 echo >&2 "***"; \
559 false; \
560 fi
Andi Kleen92979992009-01-10 04:56:13 +0100561 $(Q)ln -fsn $(srctree) source
Masahiro Yamada4fd61272018-09-18 17:45:53 +0900562 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
Masahiro Yamada156e7cb2019-03-26 13:26:58 +0900563 $(Q)test -e .gitignore || \
564 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200565endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Masahiro Yamada99516742018-10-30 22:26:34 +0900567ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
Chris Friesae6b2892017-11-07 11:46:13 -0800568ifneq ($(CROSS_COMPILE),)
Masahiro Yamada5241ab4c2019-07-29 18:15:17 +0900569CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
Nick Desaulniersad150062019-02-11 11:30:04 -0800570GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
Fangrui Songca9b31f2020-07-21 10:31:23 -0700571CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
Stefan Agneref8c4ed2018-09-17 19:31:57 -0700572GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
Chris Friesae6b2892017-11-07 11:46:13 -0800573endif
574ifneq ($(GCC_TOOLCHAIN),)
Masahiro Yamada238bcbc2018-11-06 12:04:55 +0900575CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
Chris Friesae6b2892017-11-07 11:46:13 -0800576endif
Masahiro Yamada7e20e472020-04-08 10:36:22 +0900577ifneq ($(LLVM_IAS),1)
Masahiro Yamada238bcbc2018-11-06 12:04:55 +0900578CLANG_FLAGS += -no-integrated-as
Nathan Chancellor876a0602019-06-27 12:14:48 -0700579endif
Nathan Chancellor589834b2019-06-11 11:43:31 -0700580CLANG_FLAGS += -Werror=unknown-warning-option
Masahiro Yamada238bcbc2018-11-06 12:04:55 +0900581KBUILD_CFLAGS += $(CLANG_FLAGS)
582KBUILD_AFLAGS += $(CLANG_FLAGS)
Joel Stanley3bd98052018-11-12 14:51:15 +1030583export CLANG_FLAGS
Chris Friesae6b2892017-11-07 11:46:13 -0800584endif
585
Masahiro Yamada315bab42018-06-08 09:21:43 +0900586# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
587# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
588# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
589# and from include/config/auto.conf.cmd to detect the compiler upgrade.
Masahiro Yamada902a6892019-05-09 16:35:55 +0900590CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
Masahiro Yamada315bab42018-06-08 09:21:43 +0900591
Masahiro Yamada2042b542019-08-11 00:53:03 +0900592ifdef config-build
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593# ===========================================================================
594# *config targets only - make sure prerequisites are updated, and descend
595# in scripts/kconfig to make the *config target
596
597# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
598# KBUILD_DEFCONFIG may point out an alternative default configuration
599# used for 'make defconfig'
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900600include arch/$(SRCARCH)/Makefile
Masahiro Yamada315bab42018-06-08 09:21:43 +0900601export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
Masahiro Yamada36de0772019-08-22 13:46:13 +0900603config: outputmakefile scripts_basic FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100604 $(Q)$(MAKE) $(build)=scripts/kconfig $@
605
Masahiro Yamada36de0772019-08-22 13:46:13 +0900606%config: outputmakefile scripts_basic FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 $(Q)$(MAKE) $(build)=scripts/kconfig $@
608
Masahiro Yamada2042b542019-08-11 00:53:03 +0900609else #!config-build
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610# ===========================================================================
611# Build targets only - this includes vmlinux, arch specific targets, clean
612# targets and others. In general all targets except *config targets.
613
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900614# If building an external module we do not care about the all: rule
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900615# but instead __all depend on modules
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900616PHONY += all
617ifeq ($(KBUILD_EXTMOD),)
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900618__all: all
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900619else
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900620__all: modules
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900621endif
622
623# Decide whether to build built-in, modular, or both.
624# Normally, just do built-in.
625
626KBUILD_MODULES :=
627KBUILD_BUILTIN := 1
628
629# If we have only "make modules", don't compile built-in objects.
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900630ifeq ($(MAKECMDGOALS),modules)
Masahiro Yamada4b50c8c2020-05-31 17:47:06 +0900631 KBUILD_BUILTIN :=
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900632endif
633
634# If we have "make <whatever> modules", compile modules
635# in addition to whatever we do anyway.
636# Just "make" or "make all" shall build modules as well
637
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900638ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900639 KBUILD_MODULES := 1
640endif
641
642ifeq ($(MAKECMDGOALS),)
643 KBUILD_MODULES := 1
644endif
645
646export KBUILD_MODULES KBUILD_BUILTIN
647
Masahiro Yamada2042b542019-08-11 00:53:03 +0900648ifdef need-config
Masahiro Yamadad93a18f2019-04-27 12:33:36 +0900649include include/config/auto.conf
650endif
651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653# Objects we will link into vmlinux / subdirs we need to visit
Masahiro Yamada23febe32020-06-01 14:56:57 +0900654core-y := init/ usr/
Masahiro Yamadaf96182e2019-01-11 18:52:00 +0900655drivers-y := drivers/ sound/
Masahiro Yamadad93a18f2019-04-27 12:33:36 +0900656drivers-$(CONFIG_SAMPLES) += samples/
Masahiro Yamada95fb6312020-06-01 14:56:58 +0900657drivers-y += net/ virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658libs-y := lib/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659endif # KBUILD_EXTMOD
660
Masahiro Yamada315bab42018-06-08 09:21:43 +0900661# The all: target is the default when no target is given on the
662# command line.
663# This allow a user to issue only 'make' to build a kernel including modules
664# Defaults to vmlinux, but the arch makefile usually adds further targets
665all: vmlinux
666
667CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
668 $(call cc-option,-fno-tree-loop-im) \
669 $(call cc-disable-warning,maybe-uninitialized,)
Masahiro Yamada5aadfde2018-05-28 18:22:04 +0900670export CFLAGS_GCOV
Masahiro Yamada315bab42018-06-08 09:21:43 +0900671
Paulo Zanonib1f4ff72018-09-10 10:59:56 -0700672# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
673ifdef CONFIG_FUNCTION_TRACER
674 CC_FLAGS_FTRACE := -pg
675endif
676
Masahiro Yamada669e06b2019-03-26 15:11:12 +0900677RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
678RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
679RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
680RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
681RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
682RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
683export RETPOLINE_CFLAGS
684export RETPOLINE_VDSO_CFLAGS
685
Masahiro Yamada315bab42018-06-08 09:21:43 +0900686include arch/$(SRCARCH)/Makefile
687
Masahiro Yamada2042b542019-08-11 00:53:03 +0900688ifdef need-config
689ifdef may-sync-config
Masahiro Yamada315bab42018-06-08 09:21:43 +0900690# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
691# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
692# because some architectures define CROSS_COMPILE there.
Masahiro Yamadad2f8ae02019-05-12 11:13:48 +0900693include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
Masahiro Yamada05850712019-02-22 16:40:11 +0900695$(KCONFIG_CONFIG):
696 @echo >&2 '***'
697 @echo >&2 '*** Configuration file "$@" not found!'
698 @echo >&2 '***'
699 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
700 @echo >&2 '*** "make menuconfig" or "make xconfig").'
701 @echo >&2 '***'
702 @/bin/false
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Ulf Magnusson61277982018-02-13 08:58:20 +0100704# The actual configuration files used during the build are stored in
705# include/generated/ and include/config/. Update them if .config is newer than
706# include/config/auto.conf (which mirrors .config).
Masahiro Yamada9390dff2019-02-22 16:40:10 +0900707#
708# This exploits the 'multi-target pattern rule' trick.
709# The syncconfig should be executed only once to make all the targets.
Masahiro Yamadaf463c352020-03-25 12:16:30 +0900710# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
Masahiro Yamada3044dd02020-05-01 15:01:41 +0900711%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
Masahiro Yamada911a91c2018-03-01 15:34:37 +0900712 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
Masahiro Yamada2042b542019-08-11 00:53:03 +0900713else # !may-sync-config
Masahiro Yamadad7942412018-07-20 16:46:34 +0900714# External modules and some install targets need include/generated/autoconf.h
715# and include/config/auto.conf but do not care if they are up-to-date.
716# Use auto.conf to trigger the test
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200717PHONY += include/config/auto.conf
718
719include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200720 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200721 echo >&2; \
722 echo >&2 " ERROR: Kernel configuration is invalid."; \
723 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
724 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
725 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200726 /bin/false)
727
Masahiro Yamadad7942412018-07-20 16:46:34 +0900728endif # may-sync-config
Masahiro Yamada2042b542019-08-11 00:53:03 +0900729endif # need-config
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200731KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
Linus Torvaldsef6000b2016-10-12 10:23:41 -0700732KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
Linus Torvaldsbd664f62017-07-12 19:25:47 -0700733KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
734KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
Linus Torvalds6f303d62019-05-01 11:05:41 -0700735KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200736
Masahiro Yamada15f5db62019-08-21 02:09:40 +0900737ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
738KBUILD_CFLAGS += -O2
739else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
740KBUILD_CFLAGS += -O3
741else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
742KBUILD_CFLAGS += -Os
Arnd Bergmann815eb712016-04-25 17:35:28 +0200743endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Jiri Kosina69102312014-08-06 16:08:43 -0700745# Tell gcc to never replace conditional load with a non-conditional one
746KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
Sergei Trofimovichb1112132020-03-17 00:07:18 +0000747KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
Jiri Kosina69102312014-08-06 16:08:43 -0700748
Victor Chibotarud677a4d2017-11-17 15:30:50 -0800749include scripts/Makefile.kcov
Emese Revfy6b90bd42016-05-24 00:09:38 +0200750include scripts/Makefile.gcc-plugins
751
Andi Kleen1873e872012-03-28 11:51:18 -0700752ifdef CONFIG_READABLE_ASM
753# Disable optimizations that make assembler listings hard to read.
754# reorder blocks reorders the control in the function
755# ipa clone creates specialized cloned functions
756# partial inlining inlines only parts of functions
757KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
758 $(call cc-option,-fno-ipa-cp-clone,) \
759 $(call cc-option,-fno-partial-inlining)
760endif
761
Mike Frysinger08f67462009-06-04 16:29:08 -0700762ifneq ($(CONFIG_FRAME_WARN),0)
Masahiro Yamadaa83e4ca2020-02-17 00:19:36 +0900763KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100764endif
765
Masahiro Yamada2a61f472018-05-28 18:22:00 +0900766stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
Linus Torvalds050e9ba2018-06-14 12:21:18 +0900767stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
768stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
Masahiro Yamada2a61f472018-05-28 18:22:00 +0900769
770KBUILD_CFLAGS += $(stackp-flags-y)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100771
Masahiro Yamada076f4212018-10-30 22:26:33 +0900772ifdef CONFIG_CC_IS_CLANG
Masahiro Yamadaa1494302019-05-10 23:10:09 +0900773KBUILD_CPPFLAGS += -Qunused-arguments
774KBUILD_CFLAGS += -Wno-format-invalid-specifier
775KBUILD_CFLAGS += -Wno-gnu
Masahiro Yamadacfe17c92017-11-27 21:15:13 +0900776# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
777# source of a reference will be _MergedGlobals and not on of the whitelisted names.
778# See modpost pattern 2
Masahiro Yamadaa1494302019-05-10 23:10:09 +0900779KBUILD_CFLAGS += -mno-global-merge
Masahiro Yamadacfe17c92017-11-27 21:15:13 +0900780else
781
782# These warnings generated too much noise in a regular build.
783# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
Masahiro Yamada9df3e7a2018-10-02 10:32:23 +0900784KBUILD_CFLAGS += -Wno-unused-but-set-variable
Nathan Chancellore2079e92019-08-26 17:41:55 -0700785
786# Warn about unmarked fall-throughs in switch statement.
787# Disabled for clang while comment to attribute conversion happens and
788# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
789KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
Masahiro Yamadacfe17c92017-11-27 21:15:13 +0900790endif
791
Sodagudi Prasad0a5f4172018-02-06 15:46:51 -0800792KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200794KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100796# Some targets (ARM with Thumb2, for example), can't be built with frame
797# pointers. For those, we don't have FUNCTION_TRACER automatically
798# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
799# incompatible with -fomit-frame-pointer with current GCC, so we don't use
800# -fomit-frame-pointer with FUNCTION_TRACER.
801ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200802KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100804endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Kees Cook709a9722019-04-10 08:48:31 -0700806# Initialize all stack variables with a pattern, if desired.
807ifdef CONFIG_INIT_STACK_ALL
808KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
809endif
810
Masahiro Yamada1e88e412019-02-10 15:51:00 +0900811DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
Linus Torvalds2062afb2014-07-26 14:52:01 -0700812
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200814ifdef CONFIG_DEBUG_INFO_SPLIT
Masahiro Yamada9d937442019-02-22 16:56:09 +0900815DEBUG_CFLAGS += -gsplit-dwarf
Andi Kleen866ced92014-07-30 20:50:18 +0200816else
Masahiro Yamada1e88e412019-02-10 15:51:00 +0900817DEBUG_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200818endif
Behan Webster22883282014-02-14 15:19:17 -0800819KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200821ifdef CONFIG_DEBUG_INFO_DWARF4
Masahiro Yamada9d937442019-02-22 16:56:09 +0900822DEBUG_CFLAGS += -gdwarf-4
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200823endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200825ifdef CONFIG_DEBUG_INFO_REDUCED
Masahiro Yamada1e88e412019-02-10 15:51:00 +0900826DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
Andi Kleene82c4bb2013-02-07 13:58:40 -0800827 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200828endif
829
Nick Desaulniers10e68b022020-05-26 10:18:29 -0700830ifdef CONFIG_DEBUG_INFO_COMPRESSED
831DEBUG_CFLAGS += -gz=zlib
Arvind Sankar7b169942020-06-11 18:03:39 -0400832KBUILD_AFLAGS += -gz=zlib
Nick Desaulniers10e68b022020-05-26 10:18:29 -0700833KBUILD_LDFLAGS += --compress-debug-sections=zlib
834endif
835
Masahiro Yamada1e88e412019-02-10 15:51:00 +0900836KBUILD_CFLAGS += $(DEBUG_CFLAGS)
837export DEBUG_CFLAGS
838
Steven Rostedt606576c2008-10-06 19:06:12 -0400839ifdef CONFIG_FUNCTION_TRACER
Vasily Gorbik07d04082018-08-06 15:17:44 +0200840ifdef CONFIG_FTRACE_MCOUNT_RECORD
841 # gcc 5 supports generating the mcount tables directly
842 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
843 CC_FLAGS_FTRACE += -mrecord-mcount
844 export CC_USING_RECORD_MCOUNT := 1
845 endif
Vasily Gorbik2f4df002018-08-06 15:17:46 +0200846 ifdef CONFIG_HAVE_NOP_MCOUNT
847 ifeq ($(call cc-option-yn, -mnop-mcount),y)
848 CC_FLAGS_FTRACE += -mnop-mcount
849 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
850 endif
851 endif
Steven Rostedta2546fa2011-02-09 13:15:59 -0500852endif
Steven Rostedta2546fa2011-02-09 13:15:59 -0500853ifdef CONFIG_HAVE_FENTRY
Vasily Gorbikf28bc3c2018-08-06 15:17:42 +0200854 ifeq ($(call cc-option-yn, -mfentry),y)
855 CC_FLAGS_FTRACE += -mfentry
856 CC_FLAGS_USING += -DCC_USING_FENTRY
857 endif
Steven Rostedta2546fa2011-02-09 13:15:59 -0500858endif
Vasily Gorbikf28bc3c2018-08-06 15:17:42 +0200859export CC_FLAGS_FTRACE
860KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
861KBUILD_AFLAGS += $(CC_FLAGS_USING)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400862ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400863 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400864 BUILD_C_RECORDMCOUNT := y
865 export BUILD_C_RECORDMCOUNT
866 endif
867endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200868endif
869
Sam Ravnborg91341d42008-01-21 21:31:44 +0100870# We trigger additional mismatches with less inlining
871ifdef CONFIG_DEBUG_SECTION_MISMATCH
872KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
873endif
874
Masahiro Yamada90ad4052017-04-14 15:17:26 +0900875ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
Masahiro Yamadae85d1d62018-08-22 22:51:09 +0900876KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
877LDFLAGS_vmlinux += --gc-sections
Masahiro Yamada90ad4052017-04-14 15:17:26 +0900878endif
879
Miroslav Benes43bd3a92019-04-04 20:44:11 +0200880ifdef CONFIG_LIVEPATCH
881KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
882endif
883
Sami Tolvanend08b9f02020-04-27 09:00:07 -0700884ifdef CONFIG_SHADOW_CALL_STACK
885CC_FLAGS_SCS := -fsanitize=shadow-call-stack
886KBUILD_CFLAGS += $(CC_FLAGS_SCS)
887export CC_FLAGS_SCS
888endif
889
Sam Ravnborge8e69932005-04-30 16:51:42 -0700890# arch Makefile may override CC so keep this after arch Makefile is included
Masahiro Yamadae08d6de2018-05-28 18:21:38 +0900891NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700892
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893# warn about C99 declaration after statement
Masahiro Yamadaa33e7ae2018-10-01 18:44:37 +0900894KBUILD_CFLAGS += -Wdeclaration-after-statement
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
Kees Cook0bb95f82018-06-25 15:59:34 -0700896# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
Masahiro Yamada8289f912019-05-09 15:45:49 +0900897KBUILD_CFLAGS += -Wvla
Kees Cook0bb95f82018-06-25 15:59:34 -0700898
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200899# disable pointer signed / unsigned warnings in gcc 4.0
Masahiro Yamadafb073a4b2018-10-01 18:44:36 +0900900KBUILD_CFLAGS += -Wno-pointer-sign
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
Stephen Rothwell217c3e02018-08-31 07:47:28 +1000902# disable stringop warnings in gcc 8+
903KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
904
Linus Torvalds5c45de22020-05-09 14:30:29 -0700905# We'll want to enable this eventually, but it's not going away for 5.7 at least
906KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
Linus Torvalds44720992020-05-09 14:52:44 -0700907KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
Linus Torvalds5a760212020-05-09 15:40:52 -0700908KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
Linus Torvalds5c45de22020-05-09 14:30:29 -0700909
Linus Torvaldsadc71922020-05-09 15:45:21 -0700910# Another good warning that we'll want to enable eventually
911KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
912
Linus Torvalds78a52552020-05-09 13:57:10 -0700913# Enabled with W=2, disabled by default as noisy
914KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
915
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400916# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700917KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700918
Daniel Borkmann87e0d4f2018-03-21 01:18:24 +0100919# clang sets -fmerge-all-constants by default as optimization, but this
920# is non-conforming behavior for C and in fact breaks the kernel, so we
921# need to disable it here generally.
922KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
923
924# for gcc -fno-merge-all-constants disables everything, but it is fine
925# to have actual conforming behavior enabled.
926KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
927
Linus Torvalds3ce120b2017-12-29 17:34:43 -0800928# Make sure -fstack-check isn't enabled (like gentoo apparently did)
929KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
930
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700931# conserve stack if available
932KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
933
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800934# Prohibit date/time macros, which would make the build non-deterministic
935KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
936
Daniel Wagnerea8daa72016-03-08 09:29:09 +0100937# enforce correct pointer usage
938KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
939
Kees Cookc834f0e2017-03-20 17:14:11 -0700940# Require designated initializers for all marked structures
941KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
942
Masahiro Yamadaa73619a2018-03-30 13:15:26 +0900943# change __FILE__ to the relative path from the srctree
944KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
945
Seth Forshee29be86d2019-07-17 11:06:26 -0500946# ensure -fcf-protection is disabled when using retpoline as it is
947# incompatible with -mindirect-branch=thunk-extern
948ifdef CONFIG_RETPOLINE
949KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
950endif
951
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900952include scripts/Makefile.kasan
953include scripts/Makefile.extrawarn
Andrey Ryabininc6d30852016-01-20 15:00:55 -0800954include scripts/Makefile.ubsan
Marco Elverdfd402a2019-11-14 19:02:54 +0100955include scripts/Makefile.kcsan
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900956
Masahiro Yamada8cc7af72019-08-21 02:09:41 +0900957# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
958KBUILD_CPPFLAGS += $(KCPPFLAGS)
959KBUILD_AFLAGS += $(KAFLAGS)
960KBUILD_CFLAGS += $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200961
Masahiro Yamada89ff7131f2019-07-13 13:01:10 +0900962KBUILD_LDFLAGS_MODULE += --build-id
963LDFLAGS_vmlinux += --build-id
Roland McGrath18991192007-07-19 01:48:40 -0700964
David Howells5d7d18f2009-03-04 11:59:07 -0800965ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200966LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800967endif
968
Peter Collingbourne5cf896fb62019-07-31 18:18:42 -0700969ifeq ($(CONFIG_RELR),y)
970LDFLAGS_vmlinux += --pack-dyn-relocs=relr
971endif
972
Masahiro Yamada7f3a59d2020-04-29 12:45:14 +0900973# Align the bit size of userspace programs with the kernel
Masahiro Yamada7f58b482020-07-01 00:06:25 +0900974KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
975KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
Masahiro Yamada7f3a59d2020-04-29 12:45:14 +0900976
Luc Van Oostenryck80591e62019-11-09 13:12:16 +0100977# make the checker run with the right architecture
978CHECKFLAGS += --arch=$(ARCH)
979
Luc Van Oostenryck145167652018-05-28 20:27:35 +0200980# insure the checker run with the right endianness
981CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
982
Luc Van Oostenryck1f2f01b2018-05-30 22:48:38 +0200983# the checker needs the correct machine size
984CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
985
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200987# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988# set in the environment
989# Also any assignments in arch/$(ARCH)/Makefile take precedence over
990# this default value
991export KBUILD_IMAGE ?= vmlinux
992
993#
994# INSTALL_PATH specifies where to place the updated kernel and system map
995# images. Default is /boot, but you can set it to other values
996export INSTALL_PATH ?= /boot
997
998#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000999# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1000# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1001# an argument if needed. Otherwise it defaults to the kernel install path
1002#
1003export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1004
1005#
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1007# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001008# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009#
1010
Sam Ravnborgdf9df032006-01-16 12:46:07 +01001011MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012export MODLIB
1013
Theodore Ts'oac031f22006-06-21 20:53:09 -04001014#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001015# INSTALL_MOD_STRIP, if defined, will cause modules to be
1016# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1017# the default option --strip-debug will be used. Otherwise,
1018# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +01001019
Theodore Ts'oac031f22006-06-21 20:53:09 -04001020ifdef INSTALL_MOD_STRIP
1021ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +01001022mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -04001023else
Sam Ravnborg2ea03892009-01-14 21:38:20 +01001024mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -04001025endif # INSTALL_MOD_STRIP=1
1026else
Sam Ravnborg2ea03892009-01-14 21:38:20 +01001027mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -04001028endif # INSTALL_MOD_STRIP
1029export mod_strip_cmd
1030
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +09301031# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1032# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1033# or CONFIG_MODULE_COMPRESS_XZ.
1034
1035mod_compress_cmd = true
1036ifdef CONFIG_MODULE_COMPRESS
1037 ifdef CONFIG_MODULE_COMPRESS_GZIP
Denis Efremove4a42c82020-06-08 12:59:44 +03001038 mod_compress_cmd = $(KGZIP) -n -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +09301039 endif # CONFIG_MODULE_COMPRESS_GZIP
1040 ifdef CONFIG_MODULE_COMPRESS_XZ
Denis Efremov8dfb61d2020-06-05 10:39:55 +03001041 mod_compress_cmd = $(XZ) -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +09301042 endif # CONFIG_MODULE_COMPRESS_XZ
1043endif # CONFIG_MODULE_COMPRESS
1044export mod_compress_cmd
1045
Michal Marekd9d8d7e2013-01-25 13:41:31 +10301046ifdef CONFIG_MODULE_SIG_ALL
David Woodhouse3ee550f2015-08-14 16:17:16 +01001047$(eval $(call config_filename,MODULE_SIG_KEY))
1048
1049mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
Rusty Russelle2a666d2012-10-19 11:53:15 +10301050else
1051mod_sign_cmd = true
1052endif
1053export mod_sign_cmd
1054
Rolf Eike Beer056d28d2019-03-26 12:48:39 -05001055HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1056
Josh Poimboeuf9f0c18a2017-02-15 12:21:17 -06001057ifdef CONFIG_STACK_VALIDATION
1058 has_libelf := $(call try-run,\
Rolf Eike Beer056d28d2019-03-26 12:48:39 -05001059 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
Josh Poimboeuf9f0c18a2017-02-15 12:21:17 -06001060 ifeq ($(has_libelf),1)
1061 objtool_target := tools/objtool FORCE
1062 else
Josh Poimboeuf9f0c18a2017-02-15 12:21:17 -06001063 SKIP_STACK_VALIDATION := 1
1064 export SKIP_STACK_VALIDATION
1065 endif
1066endif
1067
Masahiro Yamadae00d8882019-01-15 16:19:00 +09001068PHONY += prepare0
Rusty Russelle2a666d2012-10-19 11:53:15 +10301069
Masahiro Yamada394053f2019-08-15 00:19:18 +09001070export MODORDER := $(extmod-prefix)modules.order
Masahiro Yamadabc35d4b2019-10-29 21:38:08 +09001071export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
Masahiro Yamada47801c92019-08-02 19:23:58 +09001072
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +01001074core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
Masahiro Yamada23febe32020-06-01 14:56:57 +09001076vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Masahiro Yamada95fb6312020-06-01 14:56:58 +09001078 $(libs-y) $(libs-m)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079
Masahiro Yamada1eaca4b2019-04-27 12:33:37 +09001080vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
Masahiro Yamada23febe32020-06-01 14:56:57 +09001081 $(patsubst %/,%,$(filter %/, $(core-) \
Masahiro Yamada95fb6312020-06-01 14:56:58 +09001082 $(drivers-) $(libs-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
Masahiro Yamadab2c88552020-06-01 14:57:00 +09001084subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1085 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1086 $(drivers-y) $(drivers-m)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087
Masahiro Yamadac99f3912019-08-11 00:53:04 +09001088build-dirs := $(vmlinux-dirs)
Masahiro Yamada76cd3062019-08-11 00:53:05 +09001089clean-dirs := $(vmlinux-alldirs)
Masahiro Yamadac99f3912019-08-11 00:53:04 +09001090
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001091# Externally visible symbols (used by link-vmlinux.sh)
Masahiro Yamadaf0d50ca2020-06-01 14:56:59 +09001092KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1093KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1094ifdef CONFIG_MODULES
1095KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1096KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1097else
1098KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1099endif
1100KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1101
1102export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
Sam Ravnborg95698572012-05-05 10:18:40 +02001103export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001104export LDFLAGS_vmlinux
Masahiro Yamada85f0ae72019-09-21 22:18:46 +09001105# used by scripts/Makefile.package
Masahiro Yamada233c7412019-05-16 01:18:54 +09001106export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107
Masahiro Yamadad151e972019-01-17 09:10:04 +09001108vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109
Masahiro Yamada3fdc7d32018-03-16 16:37:15 +09001110# Recurse until adjust_autoksyms.sh is satisfied
1111PHONY += autoksyms_recursive
Nicolas Pitre2441e782016-04-22 15:25:00 -04001112ifdef CONFIG_TRIM_UNUSED_KSYMS
Masahiro Yamada1f50b802018-03-16 16:37:13 +09001113# For the kernel to actually contain only the needed exported symbols,
1114# we have to build modules as well to determine what those symbols are.
1115# (this can be evaluated only once include/config/auto.conf has been included)
Masahiro Yamadafb2d99b2020-05-31 19:11:39 +09001116KBUILD_MODULES := 1
1117
1118autoksyms_recursive: descend modules.order
1119 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1120 "$(MAKE) -f $(srctree)/Makefile vmlinux"
Masahiro Yamada1f50b802018-03-16 16:37:13 +09001121endif
1122
Masahiro Yamada07a422b2018-03-16 16:37:12 +09001123autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1124
Quentin Perret88694cf2020-02-28 17:20:15 +00001125quiet_cmd_autoksyms_h = GEN $@
1126 cmd_autoksyms_h = mkdir -p $(dir $@); \
1127 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1128
Masahiro Yamada07a422b2018-03-16 16:37:12 +09001129$(autoksyms_h):
Quentin Perret88694cf2020-02-28 17:20:15 +00001130 $(call cmd,autoksyms_h)
Nicolas Pitre23121ca2016-01-26 21:50:18 -05001131
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001132ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1133
1134# Final link of vmlinux with optional arch pass after final link
Cao jin312a3d02017-08-02 10:31:06 +08001135cmd_link-vmlinux = \
Masahiro Yamadad503ac52018-08-24 08:20:39 +09001136 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001137 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
Nicolas Pitre2441e782016-04-22 15:25:00 -04001138
Masahiro Yamada3fdc7d32018-03-16 16:37:15 +09001139vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001140 +$(call if_changed,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +02001141
Masahiro Yamada392885e2018-11-30 10:05:22 +09001142targets := vmlinux
1143
Masahiro Yamada38385f82014-04-28 16:26:18 +09001144# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145# make sure no implicit rule kicks in
Masahiro Yamadab2c88552020-06-01 14:57:00 +09001146$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147
Masahiro Yamadaba97df42019-01-03 10:16:54 +09001148filechk_kernel.release = \
Michal Marek0d0e7712013-07-11 15:34:51 +02001149 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Michal Marek0d0e7712013-07-11 15:34:51 +02001150
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +02001151# Store (new) KERNELRELEASE string in include/config/kernel.release
Masahiro Yamada24512792019-04-07 19:03:18 +09001152include/config/kernel.release: FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +02001153 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +01001154
Masahiro Yamadad8821622018-03-16 16:37:11 +09001155# Additional helpers built in scripts/
1156# Carefully list dependencies so we do not try to build scripts twice
1157# in parallel
1158PHONY += scripts
Masahiro Yamada60df1ae2018-11-29 12:13:24 +09001159scripts: scripts_basic scripts_dtc
Masahiro Yamadad8821622018-03-16 16:37:11 +09001160 $(Q)$(MAKE) $(build)=$(@)
Sam Ravnborgcb584552006-01-09 21:20:34 +01001161
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001163# or the modules are listed in "prepare".
1164# A multi level approach is used. prepareN is processed before prepareN-1.
1165# archprepare is used in arch Makefiles and when processed asm symlink,
1166# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
Masahiro Yamadaa5139fb2019-08-22 13:46:12 +09001168PHONY += prepare archprepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001169
Masahiro Yamada36de0772019-08-22 13:46:13 +09001170archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
Masahiro Yamada3044dd02020-05-01 15:01:41 +09001171 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1172 include/generated/autoconf.h
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001173
Masahiro Yamada65bba042018-11-29 11:58:50 +09001174prepare0: archprepare
Masahiro Yamada60df1ae2018-11-29 12:13:24 +09001175 $(Q)$(MAKE) $(build)=scripts/mod
Sam Ravnborg8d36a622005-09-10 21:05:36 +02001176 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001177
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178# All the preparing..
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001179prepare: prepare0 prepare-objtool
1180
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +09001181# Support for using generic headers in asm-generic
Masahiro Yamada7d0e5c22018-12-05 20:28:04 +09001182asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1183
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +09001184PHONY += asm-generic uapi-asm-generic
1185asm-generic: uapi-asm-generic
Masahiro Yamada037fc332019-03-17 11:01:09 +09001186 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1187 generic=include/asm-generic
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +09001188uapi-asm-generic:
Masahiro Yamada037fc332019-03-17 11:01:09 +09001189 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1190 generic=include/uapi/asm-generic
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +09001191
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001192PHONY += prepare-objtool
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001193prepare-objtool: $(objtool_target)
Masahiro Yamadaef7cfd02018-12-18 14:25:41 +09001194ifeq ($(SKIP_STACK_VALIDATION),1)
1195ifdef CONFIG_UNWINDER_ORC
1196 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1197 @false
1198else
1199 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1200endif
1201endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203# Generate some files
1204# ---------------------------------------------------------------------------
1205
1206# KERNELRELEASE can change from a few different places, meaning version.h
1207# needs to be updated, so this check is forced on all builds
1208
1209uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001210define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001212 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1213 exit 1; \
1214 fi; \
Masahiro Yamadaad774082018-12-31 17:24:09 +09001215 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216endef
1217
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001218define filechk_version.h
Masahiro Yamadaad774082018-12-31 17:24:09 +09001219 echo \#define LINUX_VERSION_CODE $(shell \
Jesper Juhl450c6072012-02-16 22:49:15 +01001220 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Masahiro Yamadaad774082018-12-31 17:24:09 +09001221 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001222endef
1223
Masahiro Yamada43fee2b2018-07-25 14:16:11 +09001224$(version_h): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001226 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
Sam Ravnborg273b2812009-10-18 00:52:28 +02001228include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001229 $(call filechk,utsrelease.h)
1230
Vegard Nossum179efcb2008-12-16 12:33:43 +01001231PHONY += headerdep
1232headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001233 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1234 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001235
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001237# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001238
Sam Ravnborge6883b12008-06-05 16:43:46 +02001239#Default location for installed headers
1240export INSTALL_HDR_PATH = $(objtree)/usr
1241
Masahiro Yamada59b2bd02019-06-04 19:14:02 +09001242quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1243 cmd_headers_install = \
1244 mkdir -p $(INSTALL_HDR_PATH); \
1245 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1246 usr/include $(INSTALL_HDR_PATH)
David Woodhouse6d716272006-09-24 22:16:03 +01001247
David Woodhouse8d730cf2006-06-18 11:58:39 +01001248PHONY += headers_install
Masahiro Yamada59b2bd02019-06-04 19:14:02 +09001249headers_install: headers
1250 $(call cmd,headers_install)
Paul Smith4f193362006-03-05 17:14:10 -05001251
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252PHONY += archheaders archscripts
1253
Masahiro Yamadaa5bae542019-06-04 19:14:04 +09001254hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255
Masahiro Yamada59b2bd02019-06-04 19:14:02 +09001256PHONY += headers
1257headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
Masahiro Yamada9d022c52017-10-04 12:56:04 +09001258 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
David Howells10b63952012-10-02 18:01:57 +01001259 $(error Headers not exportable for the $(SRCARCH) architecture))
Masahiro Yamadad5470d12019-06-04 19:14:03 +09001260 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1261 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
Mike Frysinger1f857122007-02-14 00:33:02 -08001262
Masahiro Yamada7ecaf062019-11-07 16:14:41 +09001263# Deprecated. It is no-op now.
David Woodhouse68475352006-06-18 12:02:10 +01001264PHONY += headers_check
Masahiro Yamada7ecaf062019-11-07 16:14:41 +09001265headers_check:
1266 @:
David Woodhouse68475352006-06-18 12:02:10 +01001267
Masahiro Yamadae949f4c2019-06-04 19:13:59 +09001268ifdef CONFIG_HEADERS_INSTALL
Masahiro Yamada59b2bd02019-06-04 19:14:02 +09001269prepare: headers
Masahiro Yamadae949f4c2019-06-04 19:13:59 +09001270endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271
Masahiro Yamadabdd77142019-06-04 19:14:01 +09001272PHONY += scripts_unifdef
1273scripts_unifdef: scripts_basic
1274 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1275
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001277# Kernel selftest
1278
1279PHONY += kselftest
1280kselftest:
Shuah Khan2bc84522017-09-06 16:44:35 -06001281 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
Shuah Khan5a5da782014-08-07 13:07:46 -06001282
Shuah Khan17eac6c2019-09-26 16:40:14 -06001283kselftest-%: FORCE
1284 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
Wang Longdcb825a2015-10-08 02:41:18 +00001285
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001286PHONY += kselftest-merge
1287kselftest-merge:
1288 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
Dan Rue6d3db462019-05-20 10:16:14 -05001289 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1290 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
Masahiro Yamada3e4c6942019-08-21 16:03:48 +09001291 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001292
Shuah Khan5a5da782014-08-07 13:07:46 -06001293# ---------------------------------------------------------------------------
Rob Herring37c8a5f2018-01-10 15:19:37 -06001294# Devicetree files
1295
1296ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1297dtstree := arch/$(SRCARCH)/boot/dts
1298endif
1299
1300ifneq ($(dtstree),)
1301
Masahiro Yamadaa5139fb2019-08-22 13:46:12 +09001302%.dtb: include/config/kernel.release scripts_dtc
Rob Herring37c8a5f2018-01-10 15:19:37 -06001303 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1304
Masahiro Yamadac473a8d2020-02-23 04:04:34 +09001305PHONY += dtbs dtbs_install dtbs_check
Masahiro Yamadab5154bf2020-03-04 12:20:36 +09001306dtbs: include/config/kernel.release scripts_dtc
Rob Herring37c8a5f2018-01-10 15:19:37 -06001307 $(Q)$(MAKE) $(build)=$(dtstree)
1308
Masahiro Yamadab5154bf2020-03-04 12:20:36 +09001309ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
Masahiro Yamadae10c4322020-03-04 12:20:37 +09001310export CHECK_DTBS=y
Masahiro Yamadab5154bf2020-03-04 12:20:36 +09001311dtbs: dt_binding_check
1312endif
1313
Masahiro Yamadab5154bf2020-03-04 12:20:36 +09001314dtbs_check: dtbs
Rob Herring4f0e3a52018-09-06 13:26:07 -05001315
Rob Herring37c8a5f2018-01-10 15:19:37 -06001316dtbs_install:
Masahiro Yamada2431f222020-03-07 02:08:51 +09001317 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
Rob Herring37c8a5f2018-01-10 15:19:37 -06001318
1319ifdef CONFIG_OF_EARLY_FLATTREE
1320all: dtbs
1321endif
1322
1323endif
1324
1325PHONY += scripts_dtc
1326scripts_dtc: scripts_basic
1327 $(Q)$(MAKE) $(build)=scripts/dtc
1328
Masahiro Yamadae10c4322020-03-04 12:20:37 +09001329ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1330export CHECK_DT_BINDING=y
1331endif
1332
Masahiro Yamadac473a8d2020-02-23 04:04:34 +09001333PHONY += dt_binding_check
Rob Herring4f0e3a52018-09-06 13:26:07 -05001334dt_binding_check: scripts_dtc
1335 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1336
Rob Herring37c8a5f2018-01-10 15:19:37 -06001337# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338# Modules
1339
1340ifdef CONFIG_MODULES
1341
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001342# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343
Michal Marek73d13932010-03-10 12:28:58 +01001344all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345
Masahiro Yamada4b50c8c2020-05-31 17:47:06 +09001346# When we're building modules with modversions, we need to consider
1347# the built-in objects during the descend as well, in order to
1348# make sure the checksums are up to date before we record them.
1349ifdef CONFIG_MODVERSIONS
1350 KBUILD_BUILTIN := 1
1351endif
1352
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001353# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001354#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001355# A module can be listed more than once in obj-m resulting in
1356# duplicate lines in modules.order files. Those are removed
1357# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358
Paul Smith4f193362006-03-05 17:14:10 -05001359PHONY += modules
Masahiro Yamada84517912020-05-11 13:21:49 +09001360modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001361 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
Masahiro Yamada84517912020-05-11 13:21:49 +09001363PHONY += modules_check
1364modules_check: modules.order
1365 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
Masahiro Yamadab2c88552020-06-01 14:57:00 +09001367cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1368
1369modules.order: $(subdir-modorder) FORCE
1370 $(call if_changed,modules_order)
1371
1372targets += modules.order
Michal Mareka6c36632010-03-08 10:07:12 +01001373
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001375PHONY += modules_prepare
Masahiro Yamada059bc9fc2018-11-29 12:56:30 +09001376modules_prepare: prepare
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377
1378# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001379PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380modules_install: _modinst_ _modinst_post
1381
Paul Smith4f193362006-03-05 17:14:10 -05001382PHONY += _modinst_
Masahiro Yamada2c6d9632020-06-20 00:09:55 +09001383_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 @rm -rf $(MODLIB)/kernel
1385 @rm -f $(MODLIB)/source
1386 @mkdir -p $(MODLIB)/kernel
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001387 @ln -s $(abspath $(srctree)) $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1389 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001390 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 fi
Masahiro Yamada1bd9a462019-07-17 15:17:50 +09001392 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
Masahiro Yamada2c6d9632020-06-20 00:09:55 +09001393 @cp -f modules.builtin $(MODLIB)/
1394 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001395 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001397# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398# boot a modules.dep even before / is mounted read-write. However the
1399# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001400PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001401_modinst_post: _modinst_
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001402 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403
Josh Boyerd890f512012-11-05 09:09:24 +10301404ifeq ($(CONFIG_MODULE_SIG), y)
1405PHONY += modules_sign
1406modules_sign:
1407 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1408endif
1409
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410else # CONFIG_MODULES
1411
1412# Modules not configured
1413# ---------------------------------------------------------------------------
1414
Masahiro Yamada612e47c2016-03-13 09:39:22 +09001415PHONY += modules modules_install
1416modules modules_install:
Michal Marek5369f552012-07-07 23:04:40 +02001417 @echo >&2
1418 @echo >&2 "The present kernel configuration has modules disabled."
1419 @echo >&2 "Type 'make config' and enable loadable module support."
1420 @echo >&2 "Then build a kernel with module support enabled."
1421 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 @exit 1
1423
1424endif # CONFIG_MODULES
1425
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426###
1427# Cleaning is done on three levels.
1428# make clean Delete most generated files
1429# Leave enough to build external modules
1430# make mrproper Delete the current configuration, and all generated files
1431# make distclean Remove editor backup files, patch leftover files and the like
1432
1433# Directories & files removed with 'make clean'
Masahiro Yamada269a5352020-06-01 14:57:11 +09001434CLEAN_FILES += include/ksym vmlinux.symvers \
Masahiro Yamada0663c682020-05-04 17:08:07 +09001435 modules.builtin modules.builtin.modinfo modules.nsdeps
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
1437# Directories & files removed with 'make mrproper'
Masahiro Yamada0663c682020-05-04 17:08:07 +09001438MRPROPER_FILES += include/config include/generated \
Masahiro Yamada46a63d42019-08-21 16:02:02 +09001439 arch/$(SRCARCH)/include/generated .tmp_objdiff \
Masahiro Yamada0663c682020-05-04 17:08:07 +09001440 debian snap tar-install \
1441 .config .config.old .version \
Masahiro Yamada46457132019-07-15 23:01:49 +09001442 Module.symvers \
David Woodhousefb117942015-07-20 21:16:30 +01001443 signing_key.pem signing_key.priv signing_key.x509 \
1444 x509.genkey extra_certificates signing_key.x509.keyid \
Masahiro Yamada46a63d42019-08-21 16:02:02 +09001445 signing_key.x509.signer vmlinux-gdb.py \
1446 *.spec
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
Masahiro Yamada46457132019-07-15 23:01:49 +09001448# Directories & files removed with 'make distclean'
Masahiro Yamada46457132019-07-15 23:01:49 +09001449DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1450
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451# clean - Delete most, but leave enough to build external modules
1452#
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453clean: rm-files := $(CLEAN_FILES)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454
Masahiro Yamada76cd3062019-08-11 00:53:05 +09001455PHONY += archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456
Pawel Mollbd1ee802012-10-29 11:23:02 +00001457vmlinuxclean:
1458 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001459 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
Pawel Mollbd1ee802012-10-29 11:23:02 +00001460
1461clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462
1463# mrproper - Delete all generated files, including .config
1464#
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001466mrproper-dirs := $(addprefix _mrproper_,scripts)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
Masahiro Yamadab421b8a2019-01-14 17:29:29 +09001468PHONY += $(mrproper-dirs) mrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469$(mrproper-dirs):
1470 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1471
Masahiro Yamadab421b8a2019-01-14 17:29:29 +09001472mrproper: clean $(mrproper-dirs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 $(call cmd,rmfiles)
1474
1475# distclean
1476#
Masahiro Yamada46457132019-07-15 23:01:49 +09001477distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1478
Paul Smith4f193362006-03-05 17:14:10 -05001479PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
1481distclean: mrproper
Masahiro Yamada46457132019-07-15 23:01:49 +09001482 $(call cmd,rmfiles)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001484 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Masahiro Yamadaf78271d2017-01-22 23:02:32 +09001485 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1486 -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 -type f -print | xargs rm -f
1488
1489
1490# Packaging of the kernel to various formats
1491# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001493%src-pkg: FORCE
Masahiro Yamada000ec952019-08-21 16:02:04 +09001494 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
Zach Brown031ecc62006-06-08 22:12:37 -07001495%pkg: include/config/kernel.release FORCE
Masahiro Yamada000ec952019-08-21 16:02:04 +09001496 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497
1498# Brief documentation of the typical targets used
1499# ---------------------------------------------------------------------------
1500
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001501boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001502boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001503board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1504board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001506PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507help:
1508 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001509 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001510 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001511 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001512 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 @echo ''
1514 @echo 'Configuration targets:'
1515 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1516 @echo ''
1517 @echo 'Other generic targets:'
1518 @echo ' all - Build all targets marked with [*]'
1519 @echo '* vmlinux - Build the bare kernel'
1520 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001521 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 @echo ' dir/ - Build all files in dir and below'
Wang YanQing40ab87a42015-12-11 00:35:19 +08001523 @echo ' dir/file.[ois] - Build specified target only'
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001524 @echo ' dir/file.ll - Build the LLVM assembly file'
1525 @echo ' (requires compiler support for LLVM assembly generation)'
Joe Perches62718972010-01-13 09:31:44 -08001526 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1527 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001528 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001529 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 @echo ' tags/TAGS - Generate tags file for editors'
1531 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001532 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001533 @echo ' kernelrelease - Output the release version string (use with make -s)'
1534 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1535 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001536 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001537 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001538 echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001539 @echo 'Static analysers:'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 @echo ' checkstack - Generate a list of stack hogs'
1541 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001542 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001543 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001544 @echo ' export_report - List the usages of all exported symbols'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001545 @echo ' headerdep - Detect inclusion cycles in headers'
Masahiro Yamada7f855fc82017-11-14 18:47:20 +09001546 @echo ' coccicheck - Check with Coccinelle'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001547 @echo ''
Matthias Maennicheb8305a2019-09-06 11:32:32 +01001548 @echo 'Tools:'
1549 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1550 @echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001551 @echo 'Kernel selftest:'
Shuah Khane51d8da2020-03-30 12:07:11 -06001552 @echo ' kselftest - Build and run kernel selftest'
1553 @echo ' Build, install, and boot kernel before'
1554 @echo ' running kselftest on it'
1555 @echo ' Run as root for full coverage'
1556 @echo ' kselftest-all - Build kernel selftest'
1557 @echo ' kselftest-install - Build and install kernel selftest'
1558 @echo ' kselftest-clean - Remove all generated kselftest files'
1559 @echo ' kselftest-merge - Merge all the config dependencies of'
1560 @echo ' kselftest to existing .config.'
Shuah Khan5a5da782014-08-07 13:07:46 -06001561 @echo ''
Rob Herring37c8a5f2018-01-10 15:19:37 -06001562 @$(if $(dtstree), \
1563 echo 'Devicetree:'; \
Stephen Boyd7aa8dd912019-08-13 11:38:25 -07001564 echo '* dtbs - Build device tree blobs for enabled boards'; \
1565 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1566 echo ' dt_binding_check - Validate device tree binding documents'; \
1567 echo ' dtbs_check - Validate device tree source files';\
Rob Herring37c8a5f2018-01-10 15:19:37 -06001568 echo '')
1569
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001570 @echo 'Userspace tools targets:'
1571 @echo ' use "make tools/help"'
1572 @echo ' or "cd tools; make help"'
1573 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 @echo 'Kernel packaging:'
Masahiro Yamada000ec952019-08-21 16:02:04 +09001575 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 @echo ''
1577 @echo 'Documentation targets:'
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001578 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001580 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001582 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 @echo ''
1584 @$(if $(boards), \
1585 $(foreach b, $(boards), \
Geert Uytterhoeven42344482019-10-25 13:53:05 +02001586 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001588 @$(if $(board-dirs), \
1589 $(foreach b, $(board-dirs), \
1590 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1591 printf " %-16s - Show all of the above\\n" help-boards; \
1592 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593
1594 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001595 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Geert Uytterhoevena64c0442019-10-25 13:52:32 +02001597 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1598 @echo ' (sparse by default)'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001599 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001600 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Masahiro Yamadae27128d2019-09-01 01:25:55 +09001601 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001602 @echo ' 1: warnings which may be relevant and do not occur too often'
1603 @echo ' 2: warnings which occur quite often but may still be relevant'
1604 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001605 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 @echo ''
1607 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1608 @echo 'For further info see the ./README file'
1609
1610
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001611help-board-dirs := $(addprefix help-,$(board-dirs))
1612
1613help-boards: $(help-board-dirs)
1614
Michal Marekfbae4d52014-11-28 13:31:43 +01001615boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001616
1617$(help-board-dirs): help-%:
1618 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1619 @$(if $(boards-per-dir), \
1620 $(foreach b, $(boards-per-dir), \
1621 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1622 echo '')
1623
1624
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625# Documentation targets
1626# ---------------------------------------------------------------------------
Jani Nikulae8939222017-10-09 18:26:15 +03001627DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1628 linkcheckdocs dochelp refcheckdocs
Jani Nikula22cba312016-05-19 15:14:05 +03001629PHONY += $(DOC_TARGETS)
Masahiro Yamadabc7b752a2019-08-22 02:33:21 +09001630$(DOC_TARGETS):
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001631 $(Q)$(MAKE) $(build)=Documentation $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632
Masahiro Yamada67274c02019-02-19 18:33:02 +09001633# Misc
1634# ---------------------------------------------------------------------------
1635
1636PHONY += scripts_gdb
Masahiro Yamada7a739ce2019-06-04 19:13:57 +09001637scripts_gdb: prepare0
Masahiro Yamada1e5ff842019-02-19 18:33:04 +09001638 $(Q)$(MAKE) $(build)=scripts/gdb
Masahiro Yamada8d2e5202019-02-19 18:33:05 +09001639 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
Masahiro Yamada67274c02019-02-19 18:33:02 +09001640
1641ifdef CONFIG_GDB_SCRIPTS
1642all: scripts_gdb
1643endif
1644
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645else # KBUILD_EXTMOD
1646
1647###
1648# External module support.
1649# When building external modules the kernel used as basis is considered
1650# read-only, and no consistency checks are made and the make
1651# system is not used on the basis kernel. If updates are required
1652# in the basis kernel ordinary make commands (without M=...) must
1653# be used.
1654#
1655# The following are the only valid targets when building external
1656# modules.
1657# make M=dir clean Delete all automatically generated files
1658# make M=dir modules Make all modules in specified dir
1659# make M=dir Same as 'make M=dir modules'
1660# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001661# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662# Assumes install directory is already created
1663
1664# We are always building modules
1665KBUILD_MODULES := 1
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666
Masahiro Yamadac99f3912019-08-11 00:53:04 +09001667build-dirs := $(KBUILD_EXTMOD)
1668PHONY += modules
Masahiro Yamada48a0f722020-06-01 14:57:14 +09001669modules: descend
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001670 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671
Paul Smith4f193362006-03-05 17:14:10 -05001672PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001673modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001674
Paul Smith4f193362006-03-05 17:14:10 -05001675install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1676PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001677_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001678 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001679 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680
Paul Smith4f193362006-03-05 17:14:10 -05001681PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001682_emodinst_post: _emodinst_
1683 $(call cmd,depmod)
1684
Masahiro Yamada76cd3062019-08-11 00:53:05 +09001685clean-dirs := $(KBUILD_EXTMOD)
Masahiro Yamadabc35d4b2019-10-29 21:38:08 +09001686clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001688PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689help:
1690 @echo ' Building external modules.'
1691 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1692 @echo ''
1693 @echo ' modules - default target, build the module(s)'
1694 @echo ' modules_install - install the module'
1695 @echo ' clean - remove generated files in module directory only'
1696 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001697
Masahiro Yamada059bc9fc2018-11-29 12:56:30 +09001698PHONY += prepare
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699endif # KBUILD_EXTMOD
1700
Masahiro Yamadab1fbfcb2019-11-18 13:52:47 +09001701# Single targets
1702# ---------------------------------------------------------------------------
1703# To build individual files in subdirectories, you can do like this:
1704#
1705# make foo/bar/baz.s
1706#
1707# The supported suffixes for single-target are listed in 'single-targets'
1708#
1709# To build only under specific subdirectories, you can do like this:
1710#
1711# make foo/bar/baz/
1712
1713ifdef single-build
1714
1715# .ko is special because modpost is needed
1716single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1717single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1718
1719$(single-ko): single_modpost
1720 @:
1721$(single-no-ko): descend
1722 @:
1723
1724ifeq ($(KBUILD_EXTMOD),)
1725# For the single build of in-tree modules, use a temporary file to avoid
1726# the situation of modules_install installing an invalid modules.order.
1727MODORDER := .modules.tmp
1728endif
1729
1730PHONY += single_modpost
1731single_modpost: $(single-no-ko)
1732 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1733 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1734
1735KBUILD_MODULES := 1
1736
1737export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1738
1739# trim unrelated directories
1740build-dirs := $(foreach d, $(build-dirs), \
1741 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1742
1743endif
1744
Masahiro Yamadab480fec2020-05-22 10:59:59 +09001745ifndef CONFIG_MODULES
1746KBUILD_MODULES :=
1747endif
1748
Masahiro Yamadac99f3912019-08-11 00:53:04 +09001749# Handle descending into subdirectories listed in $(build-dirs)
1750# Preset locale variables to speed up the build process. Limit locale
1751# tweaks to this spot to avoid wrong language settings when running
1752# make menuconfig etc.
1753# Error messages still appears in the original language
1754PHONY += descend $(build-dirs)
1755descend: $(build-dirs)
1756$(build-dirs): prepare
Masahiro Yamadab1fbfcb2019-11-18 13:52:47 +09001757 $(Q)$(MAKE) $(build)=$@ \
Masahiro Yamada20b1be52020-07-08 01:35:08 +09001758 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
Masahiro Yamadab1fbfcb2019-11-18 13:52:47 +09001759 need-builtin=1 need-modorder=1
Masahiro Yamadac99f3912019-08-11 00:53:04 +09001760
Masahiro Yamada76cd3062019-08-11 00:53:05 +09001761clean-dirs := $(addprefix _clean_, $(clean-dirs))
1762PHONY += $(clean-dirs) clean
1763$(clean-dirs):
1764 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1765
Michal Marek88d7be02010-09-06 12:00:08 +02001766clean: $(clean-dirs)
Michal Marek88d7be02010-09-06 12:00:08 +02001767 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001768 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Masahiro Yamadaef46d9b2017-11-17 01:49:13 +09001769 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
Rob Herring4f0e3a52018-09-06 13:26:07 -05001770 -o -name '*.ko.*' \
1771 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
Masahiro Yamadaef46d9b2017-11-17 01:49:13 +09001772 -o -name '*.dwo' -o -name '*.lst' \
Masahiro Yamadabbc55bd2019-10-29 21:38:07 +09001773 -o -name '*.su' -o -name '*.mod' \
Michal Marek88d7be02010-09-06 12:00:08 +02001774 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
Masahiro Yamada9a8dfb32018-03-23 22:04:31 +09001775 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
Masahiro Yamada4fa8bc92018-03-23 22:04:37 +09001776 -o -name '*.asn1.[ch]' \
Michal Marek88d7be02010-09-06 12:00:08 +02001777 -o -name '*.symtypes' -o -name 'modules.order' \
Masahiro Yamada8b41fc42019-12-19 17:33:29 +09001778 -o -name '.tmp_*.o.*' \
Emese Revfy6b90bd42016-05-24 00:09:38 +02001779 -o -name '*.c.[012]*.*' \
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001780 -o -name '*.ll' \
Michal Marek88d7be02010-09-06 12:00:08 +02001781 -o -name '*.gcno' \) -type f -print | xargs rm -f
1782
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783# Generate tags for editors
1784# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001785quiet_cmd_tags = GEN $@
Masahiro Yamada858805b2019-08-25 22:28:37 +09001786 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001788tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 $(call cmd,tags)
1790
Matthias Maennicheb8305a2019-09-06 11:32:32 +01001791# Script to generate missing namespace dependencies
1792# ---------------------------------------------------------------------------
1793
1794PHONY += nsdeps
Masahiro Yamadabff9c622019-10-29 21:38:06 +09001795nsdeps: export KBUILD_NSDEPS=1
Matthias Maennicheb8305a2019-09-06 11:32:32 +01001796nsdeps: modules
Masahiro Yamadabff9c622019-10-29 21:38:06 +09001797 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
Matthias Maennicheb8305a2019-09-06 11:32:32 +01001798
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799# Scripts to check various things for consistency
1800# ---------------------------------------------------------------------------
1801
Peter Foley279f3dd2011-04-26 17:15:01 -04001802PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1803
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001805 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001807 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808
1809versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001810 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001812 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813
Nicolas Palix74425ee2010-06-06 17:15:01 +02001814coccicheck:
Masahiro Yamada858805b2019-08-25 22:28:37 +09001815 $(Q)$(BASH) $(srctree)/scripts/$@
Nicolas Palix74425ee2010-06-06 17:15:01 +02001816
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817namespacecheck:
1818 $(PERL) $(srctree)/scripts/namespace.pl
1819
Adrian Bunk295ac052007-08-24 23:04:56 +02001820export_report:
1821 $(PERL) $(srctree)/scripts/export_report.pl
1822
Mike Marciniszync398ff02013-06-24 08:48:37 -04001823PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001824
Jeff Dike011e3a92006-12-13 00:34:12 -08001825# UML needs a little special treatment here. It wants to use the host
1826# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1827# else wants $(ARCH), including people doing cross-builds, which means
1828# that $(SUBARCH) doesn't work here.
1829ifeq ($(ARCH), um)
1830CHECKSTACK_ARCH := $(SUBARCH)
1831else
1832CHECKSTACK_ARCH := $(ARCH)
1833endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834checkstack:
1835 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Masahiro Yamada75dd4742019-07-06 12:07:11 +09001836 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001838kernelrelease:
1839 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001840
Sam Ravnborgcb584552006-01-09 21:20:34 +01001841kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001842 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843
Mike Marciniszync398ff02013-06-24 08:48:37 -04001844image_name:
1845 @echo $(KBUILD_IMAGE)
1846
Borislav Petkovea01fa92012-04-11 18:36:18 +02001847# Clear a bunch of variables before executing the submake
Masahiro Yamadaf47a23c2019-02-22 16:40:06 +09001848
1849ifeq ($(quiet),silent_)
1850tools_silent=s
1851endif
1852
Borislav Petkovea01fa92012-04-11 18:36:18 +02001853tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001854 $(Q)mkdir -p $(objtree)/tools
Masahiro Yamada75dd4742019-07-06 12:07:11 +09001855 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
Borislav Petkovea01fa92012-04-11 18:36:18 +02001856
1857tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001858 $(Q)mkdir -p $(objtree)/tools
Masahiro Yamada75dd4742019-07-06 12:07:11 +09001859 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001860
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
Masahiro Yamada0663c682020-05-04 17:08:07 +09001862 cmd_rmfiles = rm -rf $(rm-files)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001864# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001865quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001866 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Masahiro Yamada5a144a12018-05-09 16:23:48 +09001867 $(KERNELRELEASE)
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001868
Masahiro Yamada392885e2018-11-30 10:05:22 +09001869# read saved command lines for existing targets
1870existing-targets := $(wildcard $(sort $(targets)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871
Masahiro Yamadab9999232019-02-22 16:40:08 +09001872-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873
SZ Lin (林上智)46b7c492020-03-01 00:09:58 +08001874endif # config-build
Masahiro Yamada2042b542019-08-11 00:53:03 +09001875endif # mixed-build
1876endif # need-sub-make
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877
Paul Smith4f193362006-03-05 17:14:10 -05001878PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001880
Ulf Magnussonbd412d82018-07-05 12:33:07 +09001881# Declare the contents of the PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001882# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001883.PHONY: $(PHONY)