Re: [PATCH] ALSA: usb-audio: Use atomic_try_cmpxchg in ep_state_update

[Takashi Iwai]

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@xxxxxxxxx>
> Cc: Takashi Iwai <tiwai@xxxxxxx>

Thanks, applied.


Takashi