linux-kernel - Re: [PATCH 2/3] swsusp: Do not use page flags

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Message-Id: <20070319173127.72c3419d.akpm@linux-foundation.org>
Date:	Mon, 19 Mar 2007 17:31:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Pavel Machek <pavel@....cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] swsusp: Do not use page flags

On Mon, 12 Mar 2007 22:19:20 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> Make swsusp use memory bitmaps instead of page flags for marking 'nosave' and
> free pages.  This allows us to 'recycle' two page flags that can be used for other
> purposes.  Also, the memory needed to store the bitmaps is allocated when
> necessary (ie. before the suspend) and freed after the resume which is more
> reasonable.
> 
> The patch is designed to minimize the amount of changes and there are some nice
> simplifications and optimizations possible on top of it.  I am going to
> implement them separately in the future.

Blows up with ia64 allmodconfig due to CONFIG_PM=y, CONFIG_SOFTWARE_SUSPEND=n:

kernel/power/main.c:223: error: redefinition of 'software_suspend'
include/linux/suspend.h:46: error: previous definition of 'software_suspend' was here

I had a look at fixing it, but it's unobvious why we're compiling most of
kernel/power/main.c when CONFIG_SOFTWARE_SUSPEND=n so I'll send this series
back for repair please.
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