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Uroš Bizjak authored
Use atomic_try_cmpxchg_acquire(*ptr, &old, new) instead of atomic_cmpxchg_acquire(*ptr, old, new) == old in kexec_trylock(). x86 CMPXCHG instruction returns success in ZF flag, so this change saves a compare after cmpxchg. Link: https://lkml.kernel.org/r/20240719103937.53742-1-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>
Uroš Bizjak authoredUse atomic_try_cmpxchg_acquire(*ptr, &old, new) instead of atomic_cmpxchg_acquire(*ptr, old, new) == old in kexec_trylock(). x86 CMPXCHG instruction returns success in ZF flag, so this change saves a compare after cmpxchg. Link: https://lkml.kernel.org/r/20240719103937.53742-1-ubizjak@gmail.com Signed-off-by:
