On 20/02/18 22:54, Matthew Wilcox wrote:

On Tue, Feb 20, 2018 at 09:53:30PM +0200, Igor Stoppa wrote:

[...]

quoted

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.

--
igor



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