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@mforney.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190618053306.730-1-mforney@mforney.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/scripts/atomic/check-atomics.sh b/scripts/atomic/check-atomics.sh
index cfa0c2f71c84685669d4985752d519afa504a968..8378c63a1e09f1550b8b471ffad20453e30da8c1 100755 (executable)
--- 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