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Message-ID: <alpine.DEB.2.20.1602161033260.4158@east.gentwo.org>
Date: Tue, 16 Feb 2016 10:33:42 -0600 (CST)
From: Christoph Lameter <cl@...ux.com>
To: Laura Abbott <labbott@...oraproject.org>
cc: Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <js1304@...il.com>, Andrew Morton <akpm@...ux-foundation.org>,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com, Kees Cook <keescook@...omium.org>
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 <cl@...ux.com>
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