linux-kernel - Re: [PATCH 1/2] percpu: add percpu_variable

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Message-ID: <4C21DCFF.5050604@kernel.org>
Date:	Wed, 23 Jun 2010 12:07:59 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] percpu: add percpu_variable_ptr()

On 06/23/2010 12:04 PM, Lai Jiangshan wrote:
> The percpu variable and allocated percpu data are compatible
> witch each other, This patch adds a API, thus we can use
> per_cpu_ptr() for defined/declared percpu variable.
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> ---
> diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
> index ce2dc65..d5c8d7f 100644
> --- a/include/linux/percpu-defs.h
> +++ b/include/linux/percpu-defs.h
> @@ -81,6 +81,12 @@
>  #endif
>  
>  /*
> + * Ptr of the declared/defined per-CPU variable.
> + * It is totally compatible with the return from alloc_percpu().
> + */
> +#define percpu_variable_ptr(name) (&(name))

Why not just use &name?

Thanks.

-- 
tejun
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