linux-kernel - Re: [PATCH v2 -next 1/2] mm/slb: add is_kmalloc

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Date:   Wed, 23 Nov 2022 18:03:26 +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 v2 -next 1/2] mm/slb: add is_kmalloc_cache() helper
 function

Subject should say mm/slab

On 11/23/22 13:31, Feng Tang wrote:
> commit 6edf2576a6cc ("mm/slub: enable debugging memory wasting of
> kmalloc") introduces 'SLAB_KMALLOC' bit specifying whether a
> kmem_cache is a kmalloc cache for slab/slub (slob doesn't have
> dedicated kmalloc caches).
> 
> Add a helper inline function for other components like kasan to
> simplify code.
> 
> Signed-off-by: Feng Tang <feng.tang@...el.com>

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

Patch 2 seems to depend on patches in Andrew's tree so it's simpler if he
takes both of these too.

Thanks,
Vlastimil

> ---
> changlog:
>   
>   since v1:
>   * don't use macro for the helper (Andrew Morton)
>   * place the inline function in mm/slb.h to solve data structure
>     definition issue (Vlastimil Babka)
> 
>  mm/slab.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/mm/slab.h b/mm/slab.h
> index e3b3231af742..0d72fd62751a 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -325,6 +325,14 @@ static inline slab_flags_t kmem_cache_flags(unsigned int object_size,
>  }
>  #endif
>  
> +static inline bool is_kmalloc_cache(struct kmem_cache *s)
> +{
> +#ifndef CONFIG_SLOB
> +	return (s->flags & SLAB_KMALLOC);
> +#else
> +	return false;
> +#endif
> +}
>  
>  /* Legal flag mask for kmem_cache_create(), for various configurations */
>  #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \