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

14 Jul 2022


      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