linux-kernel - Re: [Patch v3 -mm 2/2] mm/kasan: simplify and refine kasan

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Date:   Wed, 4 Jan 2023 14:48:06 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Feng Tang <feng.tang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     linux-mm@...ck.org, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [Patch v3 -mm 2/2] mm/kasan: simplify and refine kasan_cache code

On 1/4/23 07:06, Feng Tang wrote:
> struct 'kasan_cache' has a member 'is_kmalloc' indicating whether
> its host kmem_cache is a kmalloc cache. With newly introduced
> is_kmalloc_cache() helper, 'is_kmalloc' and its related function can
> be replaced and removed.
> 
> Also 'kasan_cache' is only needed by KASAN generic mode, and not by
> SW/HW tag modes, so refine its protection macro accordingly, suggested
> by Andrey Konoval.
> 
> Signed-off-by: Feng Tang <feng.tang@...el.com>
> Reviewed-by: Andrey Konovalov <andreyknvl@...il.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
> Changlog:
> 
>   Since v2:
>   * Rebase latest -mm tree, fix a conflict with kasan changes

As it doesn't apply to 6.2-rc2, I assume (as with v2) the mm tree will be a
better route for both patches than slab. Thanks.

>   * Collect Reviewed-by tag
> 
>   Since v1
>   * Use CONFIG_KASAN_GENERIC instead of CONFIG_KASAN for 'kasan_cache',
>     as suggested by Andrey Konovalov
>