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Date: Tue, 16 Feb 2016 10:33:42 -0600 (CST)
From: Christoph Lameter <>
To: Laura Abbott <>
cc: Pekka Enberg <>, David Rientjes <>, 
    Joonsoo Kim <>, Andrew Morton <>,,,, Kees Cook <>
Subject: Re: [PATCHv2 4/4] slub: Relax CMPXCHG consistency restrictions

On Mon, 15 Feb 2016, Laura Abbott wrote:

> When debug options are enabled, cmpxchg on the page is disabled. This is
> because the page must be locked to ensure there are no false positives
> when performing consistency checks. Some debug options such as poisoning
> and red zoning only act on the object itself. There is no need to
> protect other CPUs from modification on only the object. Allow cmpxchg
> to happen with poisoning and red zoning are set on a slab.

Acked-by: Christoph Lameter <>

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