kexec: use atomic_try_cmpxchg in crash_kexec

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Use atomic_try_cmpxchg instead of cmpxchg (*ptr, old, new) == old in
crash_kexec().  x86 CMPXCHG instruction returns success in ZF flag,
so this change saves a compare after cmpxchg.

No functional change intended.

Link: https://lkml.kernel.org/r/20231114161228.108516-1-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Uros Bizjak 2023-11-14 17:12:01 +01:00 • committed by Andrew Morton

parent 1ee918ffa6

commit 0311d82724

1 changed files with 3 additions and 2 deletions

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kernel/kexec_core.c

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