Message-ID: <422C0A6B.1060700@suse.de>
Date: Mon, 07 Mar 2005 09:01:47 +0100
From: Stefan Seyfried <seife@suse.de>
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To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, barryn@pobox.com,
       Pavel Machek <pavel@ucw.cz>
Subject: Re: [Bug 4298] swsusp fails to suspend if CONFIG_DEBUG_PAGEALLOC
 is   also enabled
References: <20050306030852.23eb59db.akpm@osdl.org>	<20050306225730.GA1414@elf.ucw.cz> <20050306195954.6d13cff9.akpm@osdl.org>
In-Reply-To: <20050306195954.6d13cff9.akpm@osdl.org>
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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.

    Stefan

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