mm/rmap: use atomic_try_cmpxchg in set_tlb_ubc_flush_pending

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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.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Uros Bizjak 2023-02-27 22:42:28 +01:00 • committed by Andrew Morton

parent f2421a16f4

commit bdeb918810

1 changed files with 2 additions and 5 deletions

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mm/rmap.c

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