linux-kernel - Re: [patch] mm: tiny-shmem fix lor, mmap_sem vs i

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Message-Id: <1221684402.3077.15.camel@calx>
Date:	Wed, 17 Sep 2008 13:46:42 -0700
From:	Matt Mackall <mpm@...enic.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Nick Piggin <npiggin@...e.de>, mingo@...e.hu,
	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: [patch] mm: tiny-shmem fix lor, mmap_sem vs i_mutex


On Wed, 2008-09-17 at 13:14 -0700, Andrew Morton wrote:
> On Mon, 15 Sep 2008 00:12:31 +0200
> Nick Piggin <npiggin@...e.de> wrote:
> 
> > tiny-shmem calls do_truncate in shmem_file_setup. do_truncate takes i_mutex,
> > and shmem_file_setup is called with mmap_sem held. However i_mutex nests
> > outside mmap_sem.
> > 
> > Copy the code in shmem.c to avoid this problem.
> > 
> 
> It's a bit unfortunate (as in: arse-about) that we end up creating new
> files deep within the mmap code, but I guess we won't be changing that
> in a hurry.

Hugh and I talked about merging it back into one file ala the x86 32/64
merge. I've put it on my todo list.

-- 
Mathematics is the supreme nostalgia of our time.

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