linux-kernel - Re: [PATCH 1/2] tmpfs mempolicy: fix /proc/mounts corrupting memory

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Date:	Wed, 2 Jan 2013 15:57:54 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Hugh Dickins <hughd@...gle.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/2] tmpfs mempolicy: fix /proc/mounts corrupting
 memory

On Wed, 2 Jan 2013, Hugh Dickins wrote:

> @@ -2756,13 +2747,13 @@ out:
>   * @buffer:  to contain formatted mempolicy string
>   * @maxlen:  length of @buffer
>   * @pol:  pointer to mempolicy to be formatted
> - * @no_context:  "context free" mempolicy - use nodemask in w.user_nodemask
> + * @unused:  redundant argument, to be removed later.
>   *
>   * Convert a mempolicy into a string.
>   * Returns the number of characters in buffer (if positive)
>   * or an error (negative)
>   */
> -int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, int no_context)
> +int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, int unused)
>  {
>  	char *p = buffer;
>  	int l;
> @@ -2796,10 +2787,7 @@ int mpol_to_str(char *buffer, int maxlen
>  	case MPOL_BIND:
>  		/* Fall through */
>  	case MPOL_INTERLEAVE:
> -		if (no_context)
> -			nodes = pol->w.user_nodemask;
> -		else
> -			nodes = pol->v.nodes;
> +		nodes = pol->v.nodes;
>  		break;
>

no_context was always true. Why is the code from the false branch kept?
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