Re: [PATCH -next] slub: set PG_slab on all of slab pages

[Christoph Lameter]

On Wed, 29 Feb 2012, Namhyung Kim wrote:

> Unlike SLAB, SLUB doesn't set PG_slab on tail pages, so if a user would
> call free_pages() incorrectly on a object in a tail page, she will get
> confused with the undefined result. Setting the flag would help her by
> emitting a warning on bad_page() in such a case.

NAK

You cannot free a tail page of a compound higher order page independently.
You must free the whole compound.

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