Re: [PATCH] PM / Hibernate: Fix memory corruption related to swap

[KAMEZAWA Hiroyuki]

On Fri, 3 Dec 2010 00:40:36 +0100
"Rafael J. Wysocki" <rjw@xxxxxxx> wrote:

> From: Rafael J. Wysocki <rjw@xxxxxxx>
> 
> There is a problem that swap pages allocated before the creation of
> a hibernation image can be released and used for storing the contents
> of different memory pages while the image is being saved.  Since the
> kernel stored in the image doesn't know of that, it causes memory
> corruption to occur after resume from hibernation, especially on
> systems with relatively small RAM that need to swap often.
> 
> This issue can be addressed by keeping the GFP_IOFS bits clear
> in gfp_allowed_mask during the entire hibernation, including the
> saving of the image, until the system is finally turned off or
> the hibernation is aborted.  Unfortunately, for this purpose
> it's necessary to rework the way in which the hibernate and
> suspend code manipulates gfp_allowed_mask.
> 
> This change is based on an earlier patch from Hugh Dickins.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> Reported-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
> Acked-by: Hugh Dickins <hughd@xxxxxxxxxx>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

Thanks,
-Kame

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