Re: [PATCH 3/6] struct page: add field for vm_struct

From: Matthew Wilcox
Date: Tue Feb 20 2018 - 15:54:54 EST


On Tue, Feb 20, 2018 at 09:53:30PM +0200, Igor Stoppa wrote:
> The patch relies on the function vmalloc_to_page ... which will return
> NULL when applied to huge mappings, while the original implementation
> will still work.

Huh? vmalloc_to_page() should work for huge mappings...

> 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.