linux-kernel - Re: x86 warnings in arch/x86/mm/pageattr.c:560

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Date:	Wed, 21 Jan 2009 12:28:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Nick Piggin <npiggin@...e.de>
Cc:	venkatesh.pallipadi@...el.com,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: x86 warnings in arch/x86/mm/pageattr.c:560


* Nick Piggin <npiggin@...e.de> wrote:

> Hi,
> 
> I've been getting this warning intermittently since the merge window
> opened. Considering that track_pfn_vma_new is called before the ptes
> are set up in remap_pfn_range (and remap_pfn_range contains a warning
> if the ptes *are* nonzero), I don't know how this is supposed to work?
> 
> Anyway, I can of course test patches.
> 
> ------------[ cut here ]------------
> WARNING: at arch/x86/mm/pageattr.c:560 __change_page_attr_set_clr+0x9ef/0xa00()
> Hardware name: empty
> CPA: called for zero pte. vaddr = ffff8800cff4e000 cpa->vaddr = ffff8800cff4e000

Ok, i have just queued up a fix that could address this - could you please 
try latest tip/master:

   http://people.redhat.com/mingo/tip.git/README

does it still produce that warning?

	Ingo
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