linux-kernel - Re: [Bug #12872] pwc mmap always fails with EAGAIN

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Message-ID: <20090323071218.286c10e0@infradead.org>
Date:	Mon, 23 Mar 2009 07:12:18 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	小天 <xtfeng@...il.com>, Markus <M4rkusXXL@....de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #12872] pwc mmap always fails with EAGAIN

On Mon, 23 Mar 2009 10:49:45 +0000
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > >    Rename the pagerange_is_ram() to pat_pagerange_is_ram() and
> > > add the "track legacy 1MB region as non RAM" condition.
> 
> But the lowest 640K are most definitely RAM.

not all of it ;)

"ram" is defined as "the kernel memory allocator knows about it and
would hand it out" in this context; BIOS owned areas are not "ram" in
this context.
-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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