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

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Message-ID: <20110124101955.GV2232@cmpxchg.org>
Date:	Mon, 24 Jan 2011 11:19:55 +0100
From:	Johannes Weiner <hannes@...xchg.org>
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>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 7/7] memcg : remove ugly vairable initialization by
 callers

On Fri, Jan 21, 2011 at 03:50:51PM +0900, KAMEZAWA Hiroyuki 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: Johannes Weiner <hannes@...xchg.org>

Nitpick: I would remove the comments above the *ptr = NULL lines,
there should be no assumptions about the consequences in the caller
(the next patch will change the caller, and then the comments are
nothing but confusing).  It's just a plain initialization of a return
value.
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