kbuild: check sha1sum just once for each atomic header

[thirdparty/kernel/linux.git] / Kbuild

diff --git a/Kbuild b/Kbuild
index e122d93cee3206eae64400a470d8136883aec23b..0b9e8a16a621211d6ebea734ab15f19da1cfd1f7 100644 (file)
--- a/Kbuild
+++ b/Kbuild
@@ -43,17 +43,32 @@ PHONY += missing-syscalls
 missing-syscalls: scripts/checksyscalls.sh $(offsets-file)
        $(call cmd,syscalls)
 
-# Check atomic headers are up-to-date
-
-quiet_cmd_atomics = CALL    $<
-      cmd_atomics = $(CONFIG_SHELL) $<
-
-PHONY += old-atomics
-old-atomics: scripts/atomic/check-atomics.sh
-       $(call cmd,atomics)
+# Check the manual modification of atomic headers
+
+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 $@
+
+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)
        @: