linux-kernel - Re: [PATCH v3 6/9] rcu: use __this_cpu_read helper instead of per_cpu_ptr(p, raw_smp_processor

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Date:	Fri, 16 Nov 2012 16:32:50 +0800
From:	Shan Wei <shanwei88@...il.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	Shan Wei <shanwei88@...il.com>, dipankar@...ibm.com,
	Kernel-Maillist <linux-kernel@...r.kernel.org>,
	cl@...ux-foundation.org, Tejun Heo <htejun@...il.com>
Subject: Re: [PATCH v3 6/9] rcu: use __this_cpu_read helper instead of per_cpu_ptr(p,
 raw_smp_processor_id())

Shan Wei said, at 2012/11/13 9:52:
> From: Shan Wei <davidshan@...cent.com>
> 
> Signed-off-by: Shan Wei <davidshan@...cent.com>
> Acked-by: Christoph Lameter <cl@...ux.com>

Paul, would you like to pick it up to your tree?

> ---
> no changes vs v3,v2.
> ---
>  kernel/rcutree.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index 74df86b..441b945 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -1960,7 +1960,7 @@ static void force_quiescent_state(struct rcu_state *rsp)
>  	struct rcu_node *rnp_old = NULL;
>  
>  	/* 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) {
>  		ret = (ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) ||
>  		      !raw_spin_trylock(&rnp->fqslock);
> 

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