linux-kernel - Re: [PATCH] VM, x86, PAT: Change implementation of is_linear_pfn

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Date:	Thu, 12 Mar 2009 15:48:10 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Frans Pop <elendil@...net.nl>
Cc:	"mingo@...e.hu" <mingo@...e.hu>,
	"thellstrom@...are.com" <thellstrom@...are.com>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Nick Piggin <npiggin@...e.de>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>
Subject: Re: [PATCH] VM, x86, PAT: Change implementation of
 is_linear_pfn_mapping

On Thu, 2009-03-12 at 13:30 -0700, Frans Pop wrote:
> On Thursday 12 March 2009, Pallipadi, Venkatesh wrote:
> > OK, Looking more at the code, I now understand how the patch from
> > yday resulted in the oops you saw. Here goes my nth attempt at solving
> > this problem. Can you please test this patch.
> 
> System has been running stable for almost an hour now with pat enabled, so 
> it looks like the problem is solved.
> 
> FYI, with early .29 RCs I had the following when running VirtualBox:
> kernel: WARNING: at arch/x86/mm/pat.c:620 reserve_pfn_range+0x5b/0x26d()
> 
> After be03d9e80220 (which probably fixed that) VirtualBox could no longer 
> be loaded at all with pat enabled, but with this patch added VirtualBox 
> runs perfectly again.

That's great news :-).

Ingo: considering the history of this patch, can you let this cook in
your tree for a week or so and then push towards upstream-git (and .29
stable if .29 is out by then).

Thanks,
Venki

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