lkml.org 
[lkml]   [2016]   [Aug]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC][PATCH 1/3] locking/mutex: Rework mutex::owner
On Wed, Aug 24, 2016 at 10:56:59AM +0100, Will Deacon wrote:
> > + owner = atomic_long_read(&lock->owner);
> > + for (;;) {
> > + unsigned long old;
> > +
> > + old = atomic_long_cmpxchg_release(&lock->owner, owner, owner & 0x03);
> > + if (old == owner)
> > + break;
> > +
> > + owner = old;
> > + }
>
> Can you rewrite this using atomic_long_fetch_and_release?

Yes, until patch 3/3.. but now that you mention it I think we can do:

owner = atomic_long_read(&lock->owner);
if (!(owner & MUTEX_FLAG_HANDOFF))
(void)atomic_long_fetch_and_release(MUTEX_FLAGS, &lock->owner);

\
 
 \ /
  Last update: 2016-09-17 09:57    [W:0.163 / U:0.132 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site