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

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Message-ID: <alpine.DEB.2.00.1205141352440.26304@router.home>
Date:	Mon, 14 May 2012 13:53:27 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Pravin B Shelar <pshelar@...ira.com>
cc:	penberg@...nel.org, mpm@...enic.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, jesse@...ira.com, abhide@...ira.com
Subject: Re: [PATCH 1/2] mm: Fix slab->page flags corruption.

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@...ux.com>
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