The patch titled
Subject: kheaders: do not regenerate archive if config is not changed
has been added to the -mm tree. Its filename is
kheaders-do-not-regenerate-archive-if-config-is-not-changed.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kheaders-do-not-regenerate-archive-if-config-is-not-changed.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kheaders-do-not-regenerate-archive-if-config-is-not-changed.patch
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------------------------------------------------------
From: "Joel Fernandes (Google)" <joel@xxxxxxxxxxxxxxxxx>
Subject: kheaders: do not regenerate archive if config is not changed
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.
Link: http://lkml.kernel.org/r/20190515213552.203737-3-joel@xxxxxxxxxxxxxxxxx
Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/gen_kheaders.sh | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
--- a/kernel/gen_kheaders.sh~kheaders-do-not-regenerate-archive-if-config-is-not-changed
+++ a/kernel/gen_kheaders.sh
@@ -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
_
Patches currently in -mm which might be from joel@xxxxxxxxxxxxxxxxx are
kheaders-move-from-proc-to-sysfs.patch
kheaders-do-not-regenerate-archive-if-config-is-not-changed.patch
convert-struct-pid-count-to-refcount_t.patch
