linux-kernel - Re: [PATCH] mm/slab: Do not hash pointers when debugging slab

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Date:   Thu, 7 Dec 2017 14:15:27 -0600 (CST)
From:   Christopher Lameter <cl@...ux.com>
To:     Kees Cook <keescook@...omium.org>
cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Tobin C . Harding" <me@...in.cc>, Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
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
debugging.

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.