Messages in this thread | | | Date | Mon, 12 Apr 2010 08:44:08 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas of a mergeable VMA |
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On Sun, 11 Apr 2010, Rik van Riel wrote: > > Looking around the code some more, zap_pte_range() > calls page_remove_rmap(), which leaves the > page->mapping in place and has this comment:
See my earlier email about this exact issue. It's well-known that there are stale page->mapping pointers. The "page_mapped()" check _should_ have meant that in that case we never follow them, though.
> I wonder if we can clear page->mapping here, if > list_is_singular(anon_vma->head). That way we > will not leave stale pointers behind.
What does that help? What if list _isn't_ singular?
Linus
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