linux-kernel - Re: [PATCH v2 6/9] rcu: use __this_cpu_read helper instead of per_cpu_ptr(p, raw_smp_processor

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Message-ID: <0000013ac23b7ba3-d0a82d30-2929-4cd1-bdca-1b008ee9bd3d-000000@email.amazonses.com>
Date:	Fri, 2 Nov 2012 17:46:49 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Shan Wei <shanwei88@...il.com>
cc:	dipankar@...ibm.com, paulmck@...ux.vnet.ibm.com,
	Kernel-Maillist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/9] rcu: use __this_cpu_read helper instead of
 per_cpu_ptr(p, raw_smp_processor_id())

On Sat, 3 Nov 2012, Shan Wei wrote:

>
>  	/* Funnel through hierarchy to reduce memory contention. */
> -	rnp = per_cpu_ptr(rsp->rda, raw_smp_processor_id())->mynode;
> +	rnp = __this_cpu_read(rsp->rda->mynode);
>  	for (; rnp != NULL; rnp = rnp->parent) {

Reviewed-by: Christoph Lameter <cl@...ux.com>

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