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From: Takashi Iwai <tiwai@suse.de>
To: Uros Bizjak <ubizjak@gmail.com>
Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ALSA: usb-audio: Use atomic_try_cmpxchg in ep_state_update
Date: Thu, 14 Jul 2022 10:49:38 +0200	[thread overview]
Message-ID: <87wncgw02l.wl-tiwai@suse.de> (raw)
In-Reply-To: <20220713151946.4743-1-ubizjak@gmail.com>

On Wed, 13 Jul 2022 17:19:46 +0200,
Uros Bizjak wrote:
> 
> Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old in
> ep_state_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).
> 
> No functional change intended.
> 
> Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
> Cc: Takashi Iwai <tiwai@suse.de>

Thanks, applied.


Takashi

      reply	other threads:[~2022-07-14  8:49 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-13 15:19 Uros Bizjak
2022-07-14  8:49 ` Takashi Iwai [this message]

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