Re: [Bug 4298] swsusp fails to suspend if CONFIG_DEBUG_PAGEALLOC is also enabled

[Nigel Cunningham <ncunningham@cyclades.com>]

Hi,

On Mon, 2005-03-07 at 19:01, Stefan Seyfried wrote:
> Andrew Morton wrote:
> > Pavel Machek <pavel@ucw.cz> wrote:
> 
> >> Okay, that is because low-level assembly requires PSE (4mb pages for
> >> kernel) and DEBUG_PAGEALLOC disables that capability.
> >> 
> >> If you feel like rewriting assembly code to turn off paging (and thus
> >> working with PSE), go ahead, but I do not think it is worth the
> >> trouble.
> >> 
> >> OTOH we should at least tell people what went wrong, some people seen
> >> same problem on VIA cpus... Please apply,
> >> 
> > 
> > Isn't some Kconfig solution appropriate here?
> 
> Yes, but only for the CONFIG_DEBUG_PAGEALLOC case, it does not solve the
> "cpu has no PSE" case for VIA CPUs. So the Kconfig solution is an extra
> bonus.

Yeah - separate issues. Suspend2 has worked with CONFIG_DEBUG_PAGEALLOC.
You just have to map in all the pages before doing the atomic copies.

Regards,

Nigel
-- 
Nigel Cunningham
Software Engineer, Canberra, Australia
http://www.cyclades.com
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Maintainer of Suspend2 Kernel Patches http://softwaresuspend.berlios.de