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

[Peter Zijlstra]

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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