Re: [PATCHv3 4/5] mm: make compound_head() robust

[Christoph Lameter]

On Fri, 21 Aug 2015, Kirill A. Shutemov wrote:

> > Is this really true?  For example if it's a slab page, will that page
> > ever be inspected by code which is looking for the PageTail bit?
>
> +Christoph.
>
> What we know for sure is that space is not used in tail pages, otherwise
> it would collide with current compound_dtor.

Sl*b allocators only do a virt_to_head_page on tail pages.
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