netdev - Re: this cpu documentation

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Date:	Thu, 04 Apr 2013 11:35:55 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Christoph Lameter <cl@...ux.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	RongQing Li <roy.qing.li@...il.com>,
	Shan Wei <davidshan@...cent.com>, netdev@...r.kernel.org,
	Tejun Heo <htejun@...il.com>
Subject: Re: this cpu documentation

On 04/04/13 10:40, Christoph Lameter wrote:
> On Thu, 4 Apr 2013, Randy Dunlap wrote:
> 
>> Thanks.  I have a few more corrections to V2 (please see below).
> 
> From: Christoph Lameter <cl@...ux.com>
> Subject: this_cpu: Add documentation V3
> 
> Document the rationale and the way to use this_cpu operations.
> 
> V2/V3: Improved after feedback from Randy Dunlap
> 
> Signed-off-by: Christoph Lameter <cl@...ux.com>
> 
> Index: linux/Documentation/this_cpu_ops
> ===================================================================
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ linux/Documentation/this_cpu_ops	2013-04-04 12:39:38.479720028 -0500
> @@ -0,0 +1,197 @@
> +
> +Access to the variable without the lock prefix is not synchronized but
> +synchronization is not necessary since we are dealing with per cpu data
> +specific to the currently executing processor. Only the current processor
> +should be accessing that variable and therefore there are no concurirency

                                                                concurrency
again.  but hopefully Tejun has already corrected that.

Thanks.

> +issues with other processors in the system.
> +


-- 
~Randy
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