linux-kernel - Re: [PATCH v2 1/9] net: core: use this_cpu

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Message-ID: <0000013ac239c004-87f4c3e0-5c6a-4979-817f-0a0c4445a4e9-000000@email.amazonses.com>
Date:	Fri, 2 Nov 2012 17:44:55 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Shan Wei <shanwei88@...il.com>
cc:	David Miller <davem@...emloft.net>, timo.teras@....fi,
	steffen.klassert@...unet.com, NetDev <netdev@...r.kernel.org>,
	Kernel-Maillist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/9] net: core: use this_cpu_ptr per-cpu helper

On Sat, 3 Nov 2012, Shan Wei wrote:
> +++ b/net/core/flow.c
> @@ -327,11 +327,9 @@ static void flow_cache_flush_tasklet(unsigned long data)
>  static void flow_cache_flush_per_cpu(void *data)
>  {
>  	struct flow_flush_info *info = data;
> -	int cpu;
>  	struct tasklet_struct *tasklet;
>
> -	cpu = smp_processor_id();
> -	tasklet = &per_cpu_ptr(info->cache->percpu, cpu)->flush_tasklet;
> +	tasklet = &this_cpu_ptr(info->cache->percpu)->flush_tasklet

Another case for the use of this_cpu_read
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