linux-kernel - Re: [PATCH 2/3] mm/shmem.c: let shmem_show

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Date:	Wed, 21 Aug 2013 15:03:37 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chen Gang <gang.chen@...anux.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>,
	Cyrill Gorcunov <gorcunov@...il.com>, linux-mm@...ck.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mm/shmem.c: let shmem_show_mpol() return value.

On Wed, 21 Aug 2013 10:23:58 +0800 Chen Gang <gang.chen@...anux.com> wrote:

> Let shmem_show_mpol() return value, since it may fail.
> 

This patch has no effect.

> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -883,16 +883,17 @@ redirty:
>  
>  #ifdef CONFIG_NUMA
>  #ifdef CONFIG_TMPFS
> -static void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol)
> +static int shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol)
>  {
>  	char buffer[64];
>  
>  	if (!mpol || mpol->mode == MPOL_DEFAULT)
> -		return;		/* show nothing */
> +		return 0;		/* show nothing */
>  
>  	mpol_to_str(buffer, sizeof(buffer), mpol);

Perhaps you meant to check the mpol_to_str() return value here.

>  	seq_printf(seq, ",mpol=%s", buffer);
> +	return 0;
>  }
>  
>  static struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo)

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