linux-kernel - Re: [PATCH v2] blk-iolatency: Use atomic{,64}_try

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Message-Id: <165766234436.62453.4264335710864400533.b4-ty@kernel.dk>
Date:   Tue, 12 Jul 2022 15:45:44 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     ubizjak@...il.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] blk-iolatency: Use atomic{,64}_try_cmpxchg

On Tue, 12 Jul 2022 17:19:47 +0200, Uros Bizjak wrote:
> Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old
> in check_scale_change and atomic64_try_cmpxchg in blkcg_iolatency_done_bio.
> x86 CMPXCHG instruction returns success in ZF flag, so this change saves a
> compare after cmpxchg (and related move instruction in front of cmpxchg).
> 
> No functional change intended.
> 
> [...]

Applied, thanks!

[1/1] blk-iolatency: Use atomic{,64}_try_cmpxchg
      commit: aee8960c2eae12636040dbf0f04e135273b1612d

Best regards,
-- 
Jens Axboe