[tip:locking/core] locking/atomics: Use sed(1) instead of non-standard head(1) option

[tip-bot for Michael Forney]

Commit-ID:  ebf8d82bbb32720878a3867b28e655950ccee992
Gitweb:     https://git.kernel.org/tip/ebf8d82bbb32720878a3867b28e655950ccee992
Author:     Michael Forney <mforney@xxxxxxxxxxx>
AuthorDate: Mon, 17 Jun 2019 22:33:06 -0700
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 25 Jun 2019 10:17:07 +0200

locking/atomics: Use sed(1) instead of non-standard head(1) option

POSIX says the -n option must be a positive decimal integer. Not all
implementations of head(1) support negative numbers meaning offset from
the end of the file.

Instead, the sed expression '$d' has the same effect of removing the
last line of the file.

Signed-off-by: Michael Forney <mforney@xxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Cc: Boqun Feng <boqun.feng@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20190618053306.730-1-mforney@xxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 scripts/atomic/check-atomics.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/atomic/check-atomics.sh b/scripts/atomic/check-atomics.sh
index cfa0c2f71c84..8378c63a1e09 100755
--- a/scripts/atomic/check-atomics.sh
+++ b/scripts/atomic/check-atomics.sh
@@ -22,7 +22,7 @@ while read header; do
 	OLDSUM="$(tail -n 1 ${LINUXDIR}/include/${header})"
 	OLDSUM="${OLDSUM#// }"
 
-	NEWSUM="$(head -n -1 ${LINUXDIR}/include/${header} | sha1sum)"
+	NEWSUM="$(sed '$d' ${LINUXDIR}/include/${header} | sha1sum)"
 	NEWSUM="${NEWSUM%% *}"
 
 	if [ "${OLDSUM}" != "${NEWSUM}" ]; then