linux-kernel - Re: [PATCH v10 04/17] mm: slub: introduce virt_to

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Message-Id: <20150129151234.a94bea44ae34bc90dcd148b0@linux-foundation.org>
Date:	Thu, 29 Jan 2015 15:12:34 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
Cc:	linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-mm@...ck.org, Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v10 04/17] mm: slub: introduce virt_to_obj function.

On Thu, 29 Jan 2015 18:11:48 +0300 Andrey Ryabinin <a.ryabinin@...sung.com> wrote:

> virt_to_obj takes kmem_cache address, address of slab page,
> address x pointing somewhere inside slab object,
> and returns address of the begging of object.

"beginning"

The above text may as well be placed into slub_def.h as a comment.

> Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com>
> Acked-by: Christoph Lameter <cl@...ux.com>
> ---
>  include/linux/slub_def.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
> index 9abf04e..eca3883 100644
> --- a/include/linux/slub_def.h
> +++ b/include/linux/slub_def.h
> @@ -110,4 +110,9 @@ static inline void sysfs_slab_remove(struct kmem_cache *s)
>  }
>  #endif
>  
> +static inline void *virt_to_obj(struct kmem_cache *s, void *slab_page, void *x)
> +{
> +	return x - ((x - slab_page) % s->size);
> +}

"const void *x" would be better.
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