linux-kernel - Re: [PATCH v4] slab: Ignore internal flags in cache creation

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Date:	Mon, 8 Oct 2012 14:28:37 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Glauber Costa <glommer@...allels.com>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH v4] slab: Ignore internal flags in cache creation

On Fri, 5 Oct 2012, Glauber Costa wrote:

> diff --git a/mm/slab.h b/mm/slab.h
> index 7deeb44..4c35c17 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -45,6 +45,31 @@ static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t siz
>  #endif
>  
>  
> +/* Legal flag mask for kmem_cache_create(), for various configurations */
> +#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \
> +			 SLAB_DESTROY_BY_RCU | SLAB_DEBUG_OBJECTS )
> +
> +#if defined(CONFIG_DEBUG_SLAB)
> +#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
> +#elif defined(CONFIG_SLUB_DEBUG)
> +#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
> +			  SLAB_TRACE | SLAB_DEBUG_FREE)
> +#else
> +#define SLAB_DEBUG_FLAGS (0)
> +#endif
> +
> +#if defined(CONFIG_SLAB)
> +#define SLAB_CACHE_FLAGS (SLAB_MEMSPREAD | SLAB_NOLEAKTRACE | \

s/SLAB_MEMSPREAD/SLAB_MEM_SPREAD/

> +			  SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK)
> +#elif defined(CONFIG_SLUB)
> +#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
> +			  SLAB_TEMPORARY | SLAB_NOTRACK)
> +#else
> +#define SLAB_CACHE_FLAGS (0)
> +#endif
> +
> +#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
> +
>  int __kmem_cache_shutdown(struct kmem_cache *);
>  
>  #endif
--
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