From: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> commit 9a066357184485784f782719093ff804d05b85db upstream. 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@xxxxxxxxxxxxx> Signed-off-by: Matthias Maennich <maennich@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/gen_kheaders.sh | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/kernel/gen_kheaders.sh +++ b/kernel/gen_kheaders.sh @@ -41,10 +41,10 @@ obj_files_md5="$(find $dir_list -name "* this_file_md5="$(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
