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

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Date:   Tue, 25 Jun 2019 01:46:51 -0700
From:   tip-bot for Michael Forney <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, peterz@...radead.org,
        linux-kernel@...r.kernel.org, mforney@...rney.org, hpa@...or.com,
        will.deacon@....com, boqun.feng@...il.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de
Subject: [tip:locking/core] locking/atomics: Use sed(1) instead of
 non-standard head(1) option

Commit-ID:  ebf8d82bbb32720878a3867b28e655950ccee992
Gitweb:     https://git.kernel.org/tip/ebf8d82bbb32720878a3867b28e655950ccee992
Author:     Michael Forney <mforney@...rney.org>
AuthorDate: Mon, 17 Jun 2019 22:33:06 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
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@...rney.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Will Deacon <will.deacon@....com>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/20190618053306.730-1-mforney@mforney.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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