linux-kernel - Re: [PATCH 05/11] qspinlock: Optimize for smaller NR

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Date:	Wed, 18 Jun 2014 13:39:52 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, Waiman.Long@...com,
	tglx@...utronix.de, mingo@...nel.org
CC:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	paolo.bonzini@...il.com, konrad.wilk@...cle.com,
	boris.ostrovsky@...cle.com, paulmck@...ux.vnet.ibm.com,
	riel@...hat.com, torvalds@...ux-foundation.org,
	raghavendra.kt@...ux.vnet.ibm.com, david.vrabel@...rix.com,
	oleg@...hat.com, gleb@...hat.com, scott.norton@...com,
	chegu_vinod@...com, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 05/11] qspinlock: Optimize for smaller NR_CPUS

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.

Paolo
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