Re: [PATCH] posix_acl: Use try_cmpxchg in get_acl

[Christian Brauner]

On Wed, Dec 21, 2022 at 08:35:40PM +0100, Uros Bizjak wrote:
> Use try_cmpxchg instead of cmpxchg (*ptr, old, new) == old
> in get_acl. 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: Christian Brauner <brauner@xxxxxxxxxx>
> Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
> ---

Looks ok to me. But it's not urgent so I'll circle back to this post
-rc1.

Thanks!
Christian