linux-kernel - Re: [PATCH v3] slab: Ignore internal flags in cache creation

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Date:	Tue, 2 Oct 2012 12:54:17 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Glauber Costa <glommer@...allels.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH v3] slab: Ignore internal flags in cache creation

On Tue, 2 Oct 2012, Glauber Costa wrote:

> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index 9c21725..79be32e 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -107,6 +107,13 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align
>  	if (!kmem_cache_sanity_check(name, size) == 0)
>  		goto out_locked;
>  
> +	/*
> +	 * Some allocators will constraint the set of valid flags to a subset
> +	 * of all flags. We expect them to define CACHE_CREATE_MASK in this

s/CACHE_CREATE_MASK/SLAB_AVAILABLE_FLAGS/

I don't think SLAB_AVAILABLE_FLAGS is the best name we can come up with, I 
think it should be at least something like CACHE_ALLOWED_FLAGS, but I'm 
fine with whatever it turns out to be.

> +	 * case, and we'll just provide them with a sanitized version of the
> +	 * passed flags.
> +	 */
> +	flags &= SLAB_AVAILABLE_FLAGS;
>  
>  	s = __kmem_cache_alias(name, size, align, flags, ctor);
>  	if (s)
--
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