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Date: Wed, 21 Feb 2018 14:01:20 +0200
From: Igor Stoppa <>
To: Matthew Wilcox <>
CC: <>, <>, <>,
	<>, <>, <>,
	<>, <>, <>,
	<>, <>,
Subject: Re: [PATCH 3/6] struct page: add field for vm_struct

On 20/02/18 22:54, Matthew Wilcox wrote:
> On Tue, Feb 20, 2018 at 09:53:30PM +0200, Igor Stoppa wrote:


>> It was found while testing on a configuration with framebuffer.
> ... ah.  You tried to use vmalloc_to_page() on something which wasn't
> backed by a struct page.  That's *supposed* to return NULL, but my
> guess is that after this patch it returned garbage.

it seems to return garbage also without this patch, but I need to clean
up the code, try it again and possibly come up with a demo patch for
triggering the problem.

I'll investigate it more. However it doesn't seem to be related to the
functionality I need. So I plan to treat it as separate issue and leave
find_vm_area untouched, at least in pmalloc scope.


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