linux-kernel - Re: [PATCH 7/7] memcg : remove ugly vairable initialization by callers

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Message-Id: <20110121181722.896c053c.nishimura@mxp.nes.nec.co.jp>
Date:	Fri, 21 Jan 2011 18:17:22 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH 7/7] memcg : remove ugly vairable initialization by
 callers

On Fri, 21 Jan 2011 15:50:51 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> This is a promised one.
> ==
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> This patch is for removing initialization in caller of memory cgroup
> function. Some memory cgroup uses following style to bring the result
> of start function to the end function for avoiding races.
> 
>    mem_cgroup_start_A(&(*ptr))
>    /* Something very complicated can happen here. */
>    mem_cgroup_end_A(*ptr)
> 
> In some calls, *ptr should be initialized to NULL be caller. But
> it's ugly. This patch fixes that *ptr is initialized by _start
> function.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Acked-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
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