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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Pavel Machek <pavel@ucw.cz>
Subject: Re: [PATCH] x86: make sure wakeup code is below 1M -v2
Date: Thu, 12 Nov 2009 20:32:46 +0100
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Cc: Yinghai Lu <yinghai@kernel.org>, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       Len Brown <lenb@kernel.org>,
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On Thursday 12 November 2009, Pavel Machek wrote:
> On Tue 2009-11-10 18:27:23, Yinghai Lu wrote:
> > 
> > try to find_e820_area/reserve_early, and call acpi_reserve_memory early
> > 
> > to get area is below 1M
> 
> Does it fix anything? I can't tell from the changelog...

Yes, it does.  If the area is above 1M, we can't run real mode code from it.

This matters for NUMA machines supporting S3 (yes, there are a few models
out there).

Thanks,
Rafael