Re: [Xen-devel] [PATCH v9 03/19] qspinlock: Add pending bit

[Waiman Long <waiman.long@xxxxxx>]

On 04/18/2014 04:13 AM, Peter Zijlstra wrote:
> On Thu, Apr 17, 2014 at 05:20:31PM -0400, Waiman Long wrote:
> > > > +       while ((val = atomic_read(&lock->val))&   _Q_LOCKED_MASK)
> > > > +               arch_mutex_cpu_relax();
> > > That was a cpu_relax().
> > Yes, but arch_mutex_cpu_relax() is the same as cpu_relax() for x86.
> Yeah, so why bother typing more?
>
> Let the s390 people sort that if/when they try and make this work for
> them.
OK, I can revert the change if you wish. I have no objection for that.

-Longman

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