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authorMasahiro Yamada <yamada.masahiro@socionext.com>2019-10-08 21:05:53 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2019-11-11 20:10:01 +0900
commit0e11773e76098729552b750ccff79374d1e62002 (patch)
treef484cf8ce2bd6ec9b3e4e47c8b65f06ddd056859 /kernel/gen_kheaders.sh
parent9a066357184485784f782719093ff804d05b85db (diff)
downloadlinux-0e11773e76098729552b750ccff79374d1e62002.tar.bz2
kheaders: optimize md5sum calculation for in-tree builds
This script computes md5sum of headers in srctree and in objtree. However, when we are building in-tree, we know the srctree and the objtree are the same. That is, we end up with the same computation twice. In fact, the first two lines of kernel/kheaders.md5 are always the same for in-tree builds. Unify the two md5sum calculations. For in-tree builds ($building_out_of_srctree is empty), we check only two directories, "include", and "arch/$SRCARCH/include". For out-of-tree builds ($building_out_of_srctree is 1), we check 4 directories, "$srctree/include", "$srctree/arch/$SRCARCH/include", "include", and "arch/$SRCARCH/include" since we know they are all different. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'kernel/gen_kheaders.sh')
-rwxr-xr-xkernel/gen_kheaders.sh32
1 files changed, 16 insertions, 16 deletions
diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh
index b8054b0d5010..6ff86e62787f 100755
--- a/kernel/gen_kheaders.sh
+++ b/kernel/gen_kheaders.sh
@@ -21,29 +21,30 @@ arch/$SRCARCH/include/
# Uncomment it for debugging.
# if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter;
# else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi
-# find $src_file_list -name "*.h" | xargs ls -l > /tmp/src-ls-$iter
-# find $obj_file_list -name "*.h" | xargs ls -l > /tmp/obj-ls-$iter
+# find $all_dirs -name "*.h" | xargs ls -l > /tmp/ls-$iter
+
+all_dirs=
+if [ "$building_out_of_srctree" ]; then
+ for d in $dir_list; do
+ all_dirs="$all_dirs $srctree/$d"
+ done
+fi
+all_dirs="$all_dirs $dir_list"
# include/generated/compile.h is ignored because it is touched even when none
# of the source files changed. This causes pointless regeneration, so let us
# ignore them for md5 calculation.
-pushd $srctree > /dev/null
-src_files_md5="$(find $dir_list -name "*.h" |
- grep -v "include/generated/compile.h" |
- grep -v "include/generated/autoconf.h" |
- xargs ls -l | md5sum | cut -d ' ' -f1)"
-popd > /dev/null
-obj_files_md5="$(find $dir_list -name "*.h" |
- grep -v "include/generated/compile.h" |
- grep -v "include/generated/autoconf.h" |
+headers_md5="$(find $all_dirs -name "*.h" |
+ grep -v "include/generated/compile.h" |
+ grep -v "include/generated/autoconf.h" |
xargs ls -l | md5sum | cut -d ' ' -f1)"
+
# Any changes to this script will also cause a rebuild of the archive.
this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"
if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
if [ -f kernel/kheaders.md5 ] &&
- [ "$(head -n 1 kernel/kheaders.md5)" = "$src_files_md5" ] &&
- [ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$obj_files_md5" ] &&
- [ "$(head -n 3 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] &&
+ [ "$(head -n 1 kernel/kheaders.md5)" = "$headers_md5" ] &&
+ [ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] &&
[ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then
exit
fi
@@ -79,8 +80,7 @@ find $cpio_dir -printf "./%P\n" | LC_ALL=C sort | \
--owner=0 --group=0 --numeric-owner --no-recursion \
-Jcf $tarfile -C $cpio_dir/ -T - > /dev/null
-echo "$src_files_md5" > kernel/kheaders.md5
-echo "$obj_files_md5" >> kernel/kheaders.md5
+echo $headers_md5 > kernel/kheaders.md5
echo "$this_file_md5" >> kernel/kheaders.md5
echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5