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kbuild: check sha1sum just once for each atomic header

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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>
This commit is contained in:
Masahiro Yamada 2022-08-20 18:15:29 +09:00
parent a3c4d4abaa
commit b10fdeea8c
3 changed files with 23 additions and 41 deletions
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29
Kbuild
View File

@ -43,17 +43,32 @@ PHONY += missing-syscalls
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)
@:

2
Makefile
View File

@ -1110,7 +1110,7 @@ vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
$(libs-y) $(libs-m)))
build-dirs := $(vmlinux-dirs)
clean-dirs := $(sort $(vmlinux-dirs) Documentation \
clean-dirs := $(sort $(vmlinux-dirs) Documentation . \
$(patsubst %/,%,$(filter %/, $(core-) \
$(drivers-) $(libs-))))

33
scripts/atomic/check-atomics.sh
View File

@ -1,33 +0,0 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# Check if atomic headers are up-to-date
ATOMICDIR=$(dirname $0)
ATOMICTBL=${ATOMICDIR}/atomics.tbl
LINUXDIR=${ATOMICDIR}/../..
echo '' | sha1sum - > /dev/null 2>&1
if [ $? -ne 0 ]; then
printf "sha1sum not available, skipping atomic header checks.\n"
exit 0
fi
cat <<EOF |
linux/atomic/atomic-instrumented.h
linux/atomic/atomic-long.h
linux/atomic/atomic-arch-fallback.h
EOF
while read header; do
OLDSUM="$(tail -n 1 ${LINUXDIR}/include/${header})"
OLDSUM="${OLDSUM#// }"
NEWSUM="$(sed '$d' ${LINUXDIR}/include/${header} | sha1sum)"
NEWSUM="${NEWSUM%% *}"
if [ "${OLDSUM}" != "${NEWSUM}" ]; then
printf "warning: generated include/${header} has been modified.\n"
fi
done
exit 0