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authorUros Bizjak <ubizjak@gmail.com>2022-07-12 17:05:47 +0200
committerJens Axboe <axboe@kernel.dk>2022-07-12 22:38:52 +0200
commitf4b1e27db49c8b985b116aa99481b4c6a4342ed4 (patch)
tree00b3861f47de1e179c300fc038c78fc1a3854a5f /block/partitions
parentblk-mq: don't create hctx debugfs dir until q->debugfs_dir is created (diff)
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block/rq_qos: Use atomic_try_cmpxchg in atomic_inc_below
Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old in atomic_inc_below. 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. Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Link: https://lore.kernel.org/r/20220712150547.5786-1-ubizjak@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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