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Date:   Thu, 7 Dec 2017 14:15:27 -0600 (CST)
From:   Christopher Lameter <>
To:     Kees Cook <>
cc:     Geert Uytterhoeven <>,
        Pekka Enberg <>,
        David Rientjes <>,
        Joonsoo Kim <>,
        Andrew Morton <>,
        "Tobin C . Harding" <>, Linux-MM <>,
        LKML <>,
        Linus Torvalds <>
Subject: Re: [PATCH] mm/slab: Do not hash pointers when debugging slab

On Thu, 7 Dec 2017, Kees Cook wrote:

> > These SLAB config options are only used for testing so this is ok.
> Most systems use SLUB so I can't say how common CONFIG_DEBUG_SLAB is.
> (Though, FWIW with SLUB, CONFIG_SLUB_DEBUG is very common.)

CONFIG_SLUB_DEBUG is on by default because it compiles into the kernel the
runtime configurable debugging framework. It does not activate any

CONFIG_SLUB_DEBUG_ON is the equivalent to CONFIG_SLAB_DEBUG. The kernel
will boot with debugging on without any extra kernel options with these.

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