linux-kernel - Re: [PATCH 7/9] rcu: use this_cpu_ptr per-cpu helper instead of per_cpu_ptr(p, raw_smp_processor

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Message-ID: <0000013ab7eefc03-20a4ba94-f83f-4624-9dac-dfe3924277b4-000000@email.amazonses.com>
Date:	Wed, 31 Oct 2012 17:47:04 +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 7/9] rcu:  use this_cpu_ptr per-cpu helper instead of
 per_cpu_ptr(p, raw_smp_processor_id())

On Wed, 31 Oct 2012, Shan Wei wrote:

> Signed-off-by: Shan Wei <davidshan@...cent.com>
> ---
>  kernel/rcutree.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index 74df86b..3a21fcf 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_ptr(rsp->rda)->mynode;

Do

	rnp = this_cpu_read(rsp->rda->mynode);

instad.

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