netdev - Re: [PATCH] core: fix the use of this_cpu

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Date:	Mon, 01 Apr 2013 09:31:27 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	RongQing Li <roy.qing.li@...il.com>,
	Shan Wei <davidshan@...cent.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] core: fix the use of this_cpu_ptr

On Mon, 2013-04-01 at 15:21 +0000, Christoph Lameter wrote:
> On Fri, 29 Mar 2013, RongQing Li wrote:

> > flush_tasklet is not a percpu var, it is a member of percpu var.
> 
> Well then it would be best to use this_cpu_read() instead of this_cpu_ptr.
> It also will generate better code.

I believe we already had this discussion in the past.

flush_tasklet is a structure, and we need its address, not read its
content.

You can not use this_cpu_read() to get its address, and following
code is fine.

tasklet = &this_cpu_ptr(info->cache->percpu)->flush_tasklet;

Similar to this code in mm/page_alloc.c

pcp = &this_cpu_ptr(zone->pageset)->pcp;



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