linux-kernel - Re: [RFC/PATCH RESEND -next 11/21] mm: slub: share slab_err and object

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Message-ID: <alpine.DEB.2.11.1407090928530.1384@gentwo.org>
Date:	Wed, 9 Jul 2014 09:29:22 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
cc:	linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Alexey Preobrazhensky <preobr@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Michal Marek <mmarek@...e.cz>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kbuild@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org, linux-mm@...ck.org
Subject: Re: [RFC/PATCH RESEND -next 11/21] mm: slub: share slab_err and
 object_err functions

On Wed, 9 Jul 2014, Andrey Ryabinin wrote:

> Remove static and add function declarations to mm/slab.h so they
> could be used by kernel address sanitizer.

Hmmm... This is allocator specific. At some future point it would be good
to move error reporting to slab_common.c and use those from all
allocators.

> Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com>
> ---
>  mm/slab.h | 5 +++++
>  mm/slub.c | 4 ++--
>  2 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/mm/slab.h b/mm/slab.h
> index 1257ade..912af7f 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -339,5 +339,10 @@ static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
>
>  void *slab_next(struct seq_file *m, void *p, loff_t *pos);
>  void slab_stop(struct seq_file *m, void *p);
> +void slab_err(struct kmem_cache *s, struct page *page,
> +		const char *fmt, ...);
> +void object_err(struct kmem_cache *s, struct page *page,
> +		u8 *object, char *reason);
> +
>
>  #endif /* MM_SLAB_H */
> diff --git a/mm/slub.c b/mm/slub.c
> index 6641a8f..3bdd9ac 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -635,14 +635,14 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
>  	dump_stack();
>  }
>
> -static void object_err(struct kmem_cache *s, struct page *page,
> +void object_err(struct kmem_cache *s, struct page *page,
>  			u8 *object, char *reason)
>  {
>  	slab_bug(s, "%s", reason);
>  	print_trailer(s, page, object);
>  }
>
> -static void slab_err(struct kmem_cache *s, struct page *page,
> +void slab_err(struct kmem_cache *s, struct page *page,
>  			const char *fmt, ...)
>  {
>  	va_list args;
>
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