linux-kernel - Re: [PATCH 06/20] mm/slab: remove CONFIG

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Message-ID: <202311132024.80A0D5D58@keescook>
Date:   Mon, 13 Nov 2023 20:30:13 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     David Rientjes <rientjes@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marco Elver <elver@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        kasan-dev@...glegroups.com, cgroups@...r.kernel.org
Subject: Re: [PATCH 06/20] mm/slab: remove CONFIG_SLAB code from slab common
 code

On Mon, Nov 13, 2023 at 08:13:47PM +0100, Vlastimil Babka wrote:
> In slab_common.c and slab.h headers, we can now remove all code behind
> CONFIG_SLAB and CONFIG_DEBUG_SLAB ifdefs, and remove all CONFIG_SLUB
> ifdefs.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---
>  include/linux/slab.h | 13 +--------
>  mm/slab.h            | 69 ++++----------------------------------------
>  mm/slab_common.c     | 22 ++------------
>  3 files changed, 8 insertions(+), 96 deletions(-)
> 
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 34e43cddc520..90fb1f0d843a 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -24,7 +24,6 @@
>  
>  /*
>   * Flags to pass to kmem_cache_create().
> - * The ones marked DEBUG are only valid if CONFIG_DEBUG_SLAB is set.

I think this comment was wrong, yes? i.e. the "DEBUG" flags are also
used in SLUB?

Regardless:

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook