linux-kernel - Re: [PATCH 3/5] tmpfs: handle MPOL

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Date:	Wed, 17 Mar 2010 16:26:41 +0000 (GMT)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	LKML <linux-kernel@...r.kernel.org>, kiran@...lex86.org,
	cl@...ux-foundation.org, lee.schermerhorn@...com, mel@....ul.ie,
	stable@...nel.org, linux-mm <linux-mm@...ck.org>,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 3/5] tmpfs: handle MPOL_LOCAL mount option properly

On Tue, 16 Mar 2010, KOSAKI Motohiro wrote:

> commit 71fe804b6d5 (mempolicy: use struct mempolicy pointer in
> shmem_sb_info) added mpol=local mount option. but its feature is
> broken since it was born. because such code always return 1 (i.e.
> mount failure).
> 
> This patch fixes it.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Cc: Ravikiran Thirumalai <kiran@...lex86.org>

Thank you both for finding and fixing these mpol embarrassments.

But if this "mpol=local" feature was never documented (not even in the
commit log), has been broken since birth 20 months ago, and nobody has
noticed: wouldn't it be better to save a little bloat and just rip it out?

Hugh
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