dmaengine:idxd: Use local64_try_cmpxchg in perfmon_pmu_event_update

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Use local64_try_cmpxchg instead of local64_cmpxchg (*ptr, old, new) == old
in perfmon_pmu_event_update.  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, try_cmpxchg implicitly assigns old *ptr value to "old" when cmpxchg
fails. There is no need to re-read the value in the loop.

No functional change intended.

Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Link: https://lore.kernel.org/r/20230703145346.5206-1-ubizjak@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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Uros Bizjak 2023-07-03 16:52:37 +02:00 • committed by Vinod Koul

parent f1de55ff7c

commit cae701b9cc

1 changed files with 3 additions and 4 deletions

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drivers/dma/idxd/perfmon.c

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