linux-kernel - Re: [PATCH v2 3/3] mm/hwpoison: fix return value of madvise

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Date:	Tue, 27 Aug 2013 03:37:01 -0400
From:	Chen Gong <gong.chen@...ux.intel.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] mm/hwpoison: fix return value of madvise_hwpoison

On Mon, Aug 26, 2013 at 11:41:36PM -0400, Naoya Horiguchi wrote:
> Date: Mon, 26 Aug 2013 23:41:36 -0400
> From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> To: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>, Andi Kleen
>  <andi@...stfloor.org>, Fengguang Wu <fengguang.wu@...el.com>, Tony Luck
>  <tony.luck@...el.com>, gong.chen@...ux.intel.com, linux-mm@...ck.org,
>  linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v2 3/3] mm/hwpoison: fix return value of
>  madvise_hwpoison
> User-Agent: Mutt 1.5.21 (2010-09-15)
> 
> On Tue, Aug 27, 2013 at 11:38:27AM +0800, Wanpeng Li wrote:
> > Hi Naoya,
> > On Mon, Aug 26, 2013 at 11:28:16PM -0400, Naoya Horiguchi wrote:
> > >On Tue, Aug 27, 2013 at 10:39:31AM +0800, Wanpeng Li wrote:
> > >> The return value outside for loop is always zero which means madvise_hwpoison 
> > >> return success, however, this is not truth for soft_offline_page w/ failure
> > >> return value.
> > >
> > >I don't understand what you want to do for what reason. Could you clarify
> > >those?
> > 
> > int ret is defined in two place in madvise_hwpoison. One is out of for
> > loop and its value is always zero(zero means success for madvise), the 
> > other one is in for loop. The soft_offline_page function maybe return 
> > -EBUSY and break, however, the ret out of for loop is return which means 
> > madvise_hwpoison success. 
> 
> Oh, I see. Thanks.
> 
I don't think such change is a good idea. The original code is obviously
easy to confuse people. Why not removing redundant local variable?


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