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Uros Bizjak authored
Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old in set_tlb_ubc_flush_pending. 86 CMPXCHG instruction returns success in ZF flag, so this change saves a compare after cmpxchg (and related move instruction in front of cmpxchg). Also, try_cmpxchg implicitly assigns old *ptr value to "old" when cmpxchg fails. No functional change intended. Link: https://lkml.kernel.org/r/20230227214228.3533299-1-ubizjak@gmail.comSigned-off-by:
Uros Bizjak <ubizjak@gmail.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
bdeb9188