Re: [Xen-devel] [PATCH 05/11] qspinlock: Optimize for smaller NR_CPUS

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

On Wed, Jun 18, 2014 at 01:39:52PM +0200, Paolo Bonzini wrote:
> Il 15/06/2014 14:47, Peter Zijlstra ha scritto:
> >
> >-    for (;;) {
> >-            new = (val & ~_Q_PENDING_MASK) | _Q_LOCKED_VAL;
> >-
> >-            old = atomic_cmpxchg(&lock->val, val, new);
> >-            if (old == val)
> >-                    break;
> >-
> >-            val = old;
> >-    }
> >+    clear_pending_set_locked(lock, val);
> >     return;
> 
> 
> Might as well add clear_pending_set_locked already in patch 3.

Patch 4, if anywhere.

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