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Date: Thu, 7 Dec 2017 14:15:27 -0600 (CST)
From: Christopher Lameter <cl@linux.com>
Subject: Re: [PATCH] mm/slab: Do not hash pointers when debugging slab
In-Reply-To: <CAGXu5j+9qWBM3G1ZtBXPi35UGkcfXnSbgZCBjXJM35X9+hS4ug@mail.gmail.com>
Message-ID: <alpine.DEB.2.20.1712071413470.29779@nuc-kabylake>
References: <1512641861-5113-1-git-send-email-geert+renesas@glider.be> <alpine.DEB.2.20.1712070512120.7218@nuc-kabylake> <CAGXu5j+9qWBM3G1ZtBXPi35UGkcfXnSbgZCBjXJM35X9+hS4ug@mail.gmail.com>
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Sender: owner-linux-mm@kvack.org
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To: Kees Cook <keescook@chromium.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>, Pekka Enberg <penberg@kernel.org>, David Rientjes <rientjes@google.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Andrew Morton <akpm@linux-foundation.org>, "Tobin C . Harding" <me@tobin.cc>, Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>

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.

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