diff options
| author |   Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-10-08 21:05:52 +0900 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-11-11 20:10:01 +0900 |
| commit | 9a066357184485784f782719093ff804d05b85db (patch) | |
| tree | 848b852c2fec4c2a648b3cdbb49ab391341541af /kernel | |
| parent | kbuild: do not read $(KBUILD_EXTMOD)/Module.symvers (diff) | |
| download | linux-dev-9a066357184485784f782719093ff804d05b85db.tar.xz linux-dev-9a066357184485784f782719093ff804d05b85db.zip | |
kheaders: remove unneeded 'cat' command piped to 'head' / 'tail'
The 'head' and 'tail' commands can take a file path directly.
So, you do not need to run 'cat'.
cat kernel/kheaders.md5 | head -1
... is equivalent to:
head -1 kernel/kheaders.md5
and the latter saves forking one process.
While I was here, I replaced 'head -1' with 'head -n 1'.
I also replaced '==' with '=' since we do not have a good reason to
use the bashism.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'kernel')
| -rwxr-xr-x | kernel/gen_kheaders.sh | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh index 5a0fc0b0403a..b8054b0d5010 100755 --- a/kernel/gen_kheaders.sh +++ b/kernel/gen_kheaders.sh @@ -41,10 +41,10 @@ obj_files_md5="$(find $dir_list -name "*.h" | this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)" if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi if [ -f kernel/kheaders.md5 ] && - [ "$(cat kernel/kheaders.md5|head -1)" == "$src_files_md5" ] && - [ "$(cat kernel/kheaders.md5|head -2|tail -1)" == "$obj_files_md5" ] && - [ "$(cat kernel/kheaders.md5|head -3|tail -1)" == "$this_file_md5" ] && - [ "$(cat kernel/kheaders.md5|tail -1)" == "$tarfile_md5" ]; then + [ "$(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)" = "$this_file_md5" ] && + [ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then exit fi |