linux-kernel - Re: [PATCH 2.6.26-rc8-mm1] memrlimit: fix mmap

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Message-ID: <486D81B1.1020609@linux.vnet.ibm.com>
Date:	Fri, 04 Jul 2008 07:19:37 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Hugh Dickins <hugh@...itas.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 2.6.26-rc8-mm1] memrlimit: fix mmap_sem deadlock

Hugh Dickins wrote:
> "ps -f" hung after "killall make" of make -j20 kernel builds.  It's
> generally considered bad manners to down_write something you already
> have down_read.  exit_mm up_reads before calling mm_update_next_owner,
> so I guess exec_mmap can safely do so too.  (And with that repositioning
> there's not much point in mm_need_new_owner allowing for NULL mm.)
> 
> Signed-off-by: Hugh Dickins <hugh@...itas.com>

Thanks!

Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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