On Tue, 12 Jul 2022 17:44:55 +0200, Uros Bizjak wrote: > Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old > in blkcg_unuse_delay, blkcg_set_delay and blkcg_clear_delay and > atomic64_try_cmpxchg in blkcg_scale_delay. 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. > > [...] Applied, thanks! [1/1] blk-cgroup: Use atomic{,64}_try_cmpxchg commit: 96388f57d2aad9836b2c589181fa1dbaba4066b4 Best regards, -- Jens Axboe