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

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Date:	Thu, 25 Sep 2008 00:43:37 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	David Howells <dhowells@...hat.com>
cc:	Matt Mackall <mpm@...enic.com>, Nick Piggin <npiggin@...e.de>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: Re: [patch] mm: tiny-shmem fix lor, mmap_sem vs i_mutex

On Wed, 24 Sep 2008, David Howells wrote:
> Hugh Dickins <hugh@...itas.com> wrote:
> 
> > If we're hell-bent on #ifdefs throughout mm/shmem.c, I wouldn't
> > mind scattering some CONFIG_SWAPs in there too, would cut out
> > lots of overhead when swap unconfigured.  But again, how ugly?
> 
> That might be necessary: NOMMU doesn't support swap.

Matt would be dealing with that aspect in his unification: SHMEM
depends on MMU, so !MMU gives you TINY_SHMEM - I'm sure he wouldn't
have any of the SWAP stuff in the TINY_SHMEM part of his unification.
But there's still value in adding CONFIG_SWAPs too (if the #ifdefs
were tolerable, by no means clear).

Hugh
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