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

From: Ingo Molnar
Date: Wed Jan 21 2009 - 06:28:58 EST

* Nick Piggin <npiggin@xxxxxxx> 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:

does it still produce that warning?

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