Uros Bizjak
authored
Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old in __get_reqs_available. x86 CMPXCHG instruction returns success in ZF flag, so this change saves a compare after cmpxchg (and related move instruction in front of cmpxchg). Also, atomic_try_cmpxchg implicitly assigns old *ptr value to "old" when cmpxchg fails, enabling further code simplifications. No functional change intended. Link: https://lkml.kernel.org/r/20220714164851.3055-1-ubizjak@gmail.com Signed-off-by:Uros Bizjak <ubizjak@gmail.com> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
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