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kheaders: Do not regenerate archive if config is not changed

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Linus reported an issue that doing an allmodconfig was causing the
kheaders archive to be regenerated even though the config is the same.
This patch fixes the issue by ignoring the config-related header files
for "knowing when to regenerate based on timestamps".  Instead, if the
CONFIG_X_Y option really changes, then we there are the
include/config/X/Y.h which will already tells us "if a config really
changed". So we don't really need these files for regeneration detection
anyway, and ignoring them fixes Linus's issue.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joel Fernandes (Google) 2019-05-15 17:35:52 -04:00 committed by Greg Kroah-Hartman
parent f7b101d330
commit 1457dc9ed8
1 changed files with 11 additions and 4 deletions
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15
kernel/gen_kheaders.sh
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@ -31,9 +31,8 @@ arch/$SRCARCH/include/
# This block is useful for debugging the incremental builds.
# Uncomment it for debugging.
# iter=1
# if [ ! -f /tmp/iter ]; then echo 1 > /tmp/iter;
# else; iter=$(($(cat /tmp/iter) + 1)); fi
# if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter;
# else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi
# find $src_file_list -type f | xargs ls -lR > /tmp/src-ls-$iter
# find $obj_file_list -type f | xargs ls -lR > /tmp/obj-ls-$iter
@ -43,10 +42,18 @@ arch/$SRCARCH/include/
pushd $kroot > /dev/null
src_files_md5="$(find $src_file_list -type f |
grep -v "include/generated/compile.h" |
grep -v "include/generated/autoconf.h" |
grep -v "include/config/auto.conf" |
grep -v "include/config/auto.conf.cmd" |
grep -v "include/config/tristate.conf" |
xargs ls -lR | md5sum | cut -d ' ' -f1)"
popd > /dev/null
obj_files_md5="$(find $obj_file_list -type f |
grep -v "include/generated/compile.h" |
grep -v "include/generated/autoconf.h" |
grep -v "include/config/auto.conf" |
grep -v "include/config/auto.conf.cmd" |
grep -v "include/config/tristate.conf" |
xargs ls -lR | md5sum | cut -d ' ' -f1)"
if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
@ -82,7 +89,7 @@ find $cpio_dir -type f -print0 |
tar -Jcf $tarfile -C $cpio_dir/ . > /dev/null
echo "$src_files_md5" > kernel/kheaders.md5
echo "$src_files_md5" > kernel/kheaders.md5
echo "$obj_files_md5" >> kernel/kheaders.md5
echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5