linux-kernel - Re: [PATCH] Code clean up for percpu

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Date:	Wed, 12 Oct 2011 08:59:09 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	"Alex,Shi" <alex.shi@...el.com>
cc:	"tj@...nel.org" <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"Huang, Ying" <ying.huang@...el.com>
Subject: Re: [PATCH] Code clean up for percpu_xxx() functions

On Wed, 12 Oct 2011, Alex,Shi wrote:

>  #ifdef CONFIG_SMP
>  #define __percpu_prefix                "%%"__stringify(__percpu_seg)":"
> -#define __my_cpu_offset                percpu_read(this_cpu_off)
> +#define __my_cpu_offset                __this_cpu_read(this_cpu_off)
>
> I do not quite understand you here. Do you mean to change every possible
> this_cpu_xxx() to __this_cpu_xxx()?

Change only those locations where the kernel thread cannot be preempted.


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