locking/pvqspinlock: Use try_cmpxchg() in qspinlock_paravirt.h

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

No functional change intended.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Waiman Long <longman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20240411192317.25432-2-ubizjak@gmail.com

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Uros Bizjak 2024-04-11 21:22:55 +02:00 • committed by Ingo Molnar

parent 6a97734f22

commit fea0e1820b

1 changed files with 8 additions and 8 deletions

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kernel/locking/qspinlock_paravirt.h

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