linux-kernel - Re: [PATCH 0/3] mm: mempolicy: the failure processing about mpol_to

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Date:	Tue, 20 Aug 2013 13:41:40 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Mel Gorman <mgorman@...e.de>, kosaki.motohiro@...fujitsu.com,
	riel@...hat.com, hughd@...gle.com, xemul@...allels.com,
	rientjes@...gle.com, Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] mm: mempolicy: the failure processing about mpol_to_str()

On 08/20/2013 01:30 PM, Cyrill Gorcunov wrote:
> On Tue, Aug 20, 2013 at 11:56:15AM +0800, Chen Gang wrote:
>> For the implementation (patch 1/3), need fill buffer as full as
>> possible when buffer space is not enough.
>>
>> For the caller (patch 2/3, 3/3), need check the return value of
>> mpol_to_str().
>>
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> 
> Won't simple check for mpol_to_str() < 0 be enough? IOW fix all
> callers to check that mpol_to_str exit without errors. As far
> as I see here are only two users. Something like
> 
> show_numa_map
> 	ret = mpol_to_str();
> 	if (ret)
> 		return ret;
> 
> shmem_show_mpol
> 	ret = mpol_to_str();
> 	if (ret)
> 		return ret;
> 

need "if (ret < 0)" instead of.  ;-)

> sure you'll have to change shmem_show_mpol statement to return int code.
> Won't this be more short and convenient?
> 
> 

Hmm... if return -ENOSPC, in common processing, it still need continue
(but need let outside know about the string truncation).

So I still suggest to give more check for it.


Thanks.
-- 
Chen Gang
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