Re: [PATCH 1/2] mm: Fix slab->page flags corruption.

[Christoph Lameter]

On Mon, 14 May 2012, Pravin B Shelar wrote:

> Transparent huge pages can change page->flags (PG_compound_lock)
> without taking Slab lock. Since THP can not break slab pages we can
> safely access compound page without taking compound lock.
>
> Specificly this patch fixes race between compound_unlock and slab
> functions which does page-flags update. This can occur when
> get_page/put_page is called on page from slab object.

You need to also get this revbiewed by the THP folks like Andrea &
friends.

Reviewed-by: Christoph Lameter <cl@xxxxxxxxx>
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