linux-kernel - Re: No more bits in vm_area_struct's vm

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Message-ID: <4ABCADCB.1080801@crca.org.au>
Date:	Fri, 25 Sep 2009 21:47:23 +1000
From:	Nigel Cunningham <ncunningham@...a.org.au>
To:	Hugh Dickins <hugh.dickins@...cali.co.uk>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: No more bits in vm_area_struct's vm_flags.

Hi.

Hugh Dickins wrote:
> On Fri, 25 Sep 2009, Nigel Cunningham wrote:
>> Hugh Dickins wrote:
>>> Does TuxOnIce rely on CONFIG_MMU?  If so, then the TuxOnIce patch
>>> could presumably reuse VM_MAPPED_COPY for now - but don't be
>>> surprised if that's one we clean away later on.
>> Hmm. I'm not sure. The requirements are the same as for swsusp and
>> uswsusp. Is there some tool to graph config dependencies?
> 
> If its requirements are the same as theirs, then I think yes,
> TuxOnIce relies on  config MMU: because config HIBERNATION depends
> on SWAP (kernel/power/Kconfig) and config SWAP depends on MMU
> (init/Kconfig).
> 
> But I hesitated to assume that, because in the TuxOnIce patch I have
> here for reference (e.g. when deciding it'll cause you unwelcome hassle
> if I move swap_info_struct from swap.h to swapfile.c!), it looked as if
> you support saving to an ordinary file, not just to a swap file?

Yes, that's right.

>> Is there some tool to graph config dependencies?
> 
> I don't know it, but would be nice, and maybe it does exist.

Okee doke.

Nigel
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