kbuild: check sha1sum just once for each atomic header
It is unneeded to check the sha1sum every time.
Create the timestamp files to manage it.
Add '.' to clean-dirs because 'make clean' must visit ./Kbuild to
clean up the timestamp files.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff --git a/Kbuild b/Kbuild
index e122d93..0b9e8a1 100644
--- a/Kbuild
+++ b/Kbuild
@@ -43,17 +43,32 @@
missing-syscalls: scripts/checksyscalls.sh $(offsets-file)
$(call cmd,syscalls)
-# Check atomic headers are up-to-date
+# Check the manual modification of atomic headers
-quiet_cmd_atomics = CALL $<
- cmd_atomics = $(CONFIG_SHELL) $<
+quiet_cmd_check_sha1 = CHKSHA1 $<
+ cmd_check_sha1 = \
+ if ! command -v sha1sum >/dev/null; then \
+ echo "warning: cannot check the header due to sha1sum missing"; \
+ exit 0; \
+ fi; \
+ if [ "$$(sed -n '$$s:// ::p' $<)" != \
+ "$$(sed '$$d' $< | sha1sum | sed 's/ .*//')" ]; then \
+ echo "error: $< has been modified." >&2; \
+ exit 1; \
+ fi; \
+ touch $@
-PHONY += old-atomics
-old-atomics: scripts/atomic/check-atomics.sh
- $(call cmd,atomics)
+atomic-checks += $(addprefix $(obj)/.checked-, \
+ atomic-arch-fallback.h \
+ atomic-instrumented.h \
+ atomic-long.h)
+
+targets += $(atomic-checks)
+$(atomic-checks): $(obj)/.checked-%: include/linux/atomic/% FORCE
+ $(call if_changed,check_sha1)
# A phony target that depends on all the preparation targets
PHONY += prepare
-prepare: $(offsets-file) missing-syscalls old-atomics
+prepare: $(offsets-file) missing-syscalls $(atomic-checks)
@:
