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

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Message-ID: <Y37HBTKnLVT03H5y@feng-clx>
Date:   Thu, 24 Nov 2022 09:21:09 +0800
From:   Feng Tang <feng.tang@...el.com>
To:     Vlastimil Babka <vbabka@...e.cz>
CC:     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>,
        <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

On Wed, Nov 23, 2022 at 06:03:26PM +0100, Vlastimil Babka wrote:
> Subject should say mm/slab

My bad, thanks for catching this.

> 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>

Thanks!

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

Yes, patch 2/2 change many places of kasan code.

Hi Andrew,

Could you consider taking these 2 patches to your tree? If you think
it's too close to the merge windown, I can respin after 6.2. thanks!

- Feng

> 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 | \
>