s390/ftrace: Add -mfentry and -mnop-mcount support
Utilize -mfentry and -mnop-mcount gcc options together with
-mrecord-mcount to get compiler generated calls to the profiling functions
as nops which are compatible with current -mhotpatch=0,3 approach. At the
same time -mrecord-mcount enables __mcount_loc section generation by
the compiler which allows to avoid using scripts/recordmcount.pl script.
Link: http://lkml.kernel.org/r/patch-4.thread-aa7b8d.git-aa7b8dbf236f.your-ad-here.call-01533557518-ext-9465@work.hours
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index 68a6904..8498bab 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -86,13 +86,15 @@
endif
ifdef CONFIG_FUNCTION_TRACER
-# make use of hotpatch feature if the compiler supports it
-cc_hotpatch := -mhotpatch=0,3
-ifeq ($(call cc-option-yn,$(cc_hotpatch)),y)
-CC_FLAGS_FTRACE := $(cc_hotpatch)
-KBUILD_AFLAGS += -DCC_USING_HOTPATCH
-KBUILD_CFLAGS += -DCC_USING_HOTPATCH
-endif
+ ifeq ($(call cc-option-yn,-mfentry -mnop-mcount),n)
+ # make use of hotpatch feature if the compiler supports it
+ cc_hotpatch := -mhotpatch=0,3
+ ifeq ($(call cc-option-yn,$(cc_hotpatch)),y)
+ CC_FLAGS_FTRACE := $(cc_hotpatch)
+ KBUILD_AFLAGS += -DCC_USING_HOTPATCH
+ KBUILD_CFLAGS += -DCC_USING_HOTPATCH
+ endif
+ endif
endif
# Test CFI features of binutils
