linux-kernel - Re: [patch 6/6] slab: only define SLAB_CACHE_DMA for CONFIG_ZONE

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Date:	Wed, 25 May 2011 16:37:50 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch 6/6] slab: only define SLAB_CACHE_DMA for
 CONFIG_ZONE_DMA

On Wed, 25 May 2011, Heiko Carstens wrote:

> Ok, now I see what you want. But please let's don't add an
> #ifdef CONFIG_ZONE_DMA
> to the dasd driver. Instead just re-add ZONE_DMA to 31-bit s390. Everything
> would be in ZONE_DMA again and ZONE_NORMAL would be empty. Doesn't matter
> if we have an additional zone, since 31-bit support isn't important anymore.
> 

Ok, that's fine.  Many other architectures do not allow this to be 
disabled, so we can add s390 to the list.

> So I could add the following patch to the s390 tree, if wanted:
> 

Sure!  Please remove the CONFIG_ZONE_DMA from 
arch/s390/appldata/appldata_mem.c as well and then add my:

	Acked-by: David Rientjes <rientjes@...gle.com>

once you sign-it-off.

> ---
>  arch/s390/Kconfig   |    2 +-
>  arch/s390/mm/init.c |    2 --
>  2 files changed, 1 insertion(+), 3 deletions(-)
> 
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -2,7 +2,7 @@ config MMU
>  	def_bool y
>  
>  config ZONE_DMA
> -	def_bool y if 64BIT
> +	def_bool y
>  
>  config LOCKDEP_SUPPORT
>  	def_bool y
> --- a/arch/s390/mm/init.c
> +++ b/arch/s390/mm/init.c
> @@ -119,9 +119,7 @@ void __init paging_init(void)
>  	sparse_memory_present_with_active_regions(MAX_NUMNODES);
>  	sparse_init();
>  	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
> -#ifdef CONFIG_ZONE_DMA
>  	max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
> -#endif
>  	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
>  	free_area_init_nodes(max_zone_pfns);
>  	fault_init();
> 
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