linux-kernel - Re: [PATCH 3/3] mm: Introduce HAVE_ARCH_TRANSPARENT

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Date:	Wed, 12 Sep 2012 17:32:06 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Will Deacon <will.deacon@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, akpm@...ux-foundation.org,
	Steve Capper <steve.capper@....com>
Subject: Re: [PATCH 3/3] mm: Introduce HAVE_ARCH_TRANSPARENT_HUGEPAGE

On Tue 11-09-12 17:47:16, Will Deacon wrote:
> From: Steve Capper <steve.capper@....com>
> 
> Different architectures have slightly different pre-requisites for supporting
> Transparent Huge Pages. To simplify the layout of mm/Kconfig, a new option
> HAVE_ARCH_TRANSPARENT_HUGEPAGE is introduced and set in each architecture's
> Kconfig file (at the moment x86, with ARM being set in a future patch).
> 
> Signed-off-by: Steve Capper <steve.capper@....com>
> Signed-off-by: Will Deacon <will.deacon@....com>

Makes sense if there are going to be more archs to support THP.
Reviewed-by: Michal Hocko <mhocko@...e.cz>

> ---
>  arch/x86/Kconfig |    4 ++++
>  mm/Kconfig       |    2 +-
>  2 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 8ec3a1a..7decdcf 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1297,6 +1297,10 @@ config ILLEGAL_POINTER_VALUE
>         default 0 if X86_32
>         default 0xdead000000000000 if X86_64
>  
> +config HAVE_ARCH_TRANSPARENT_HUGEPAGE
> +       def_bool y
> +       depends on MMU
> +
>  source "mm/Kconfig"
>  
>  config HIGHPTE
> diff --git a/mm/Kconfig b/mm/Kconfig
> index d5c8019..3322342 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -318,7 +318,7 @@ config NOMMU_INITIAL_TRIM_EXCESS
>  
>  config TRANSPARENT_HUGEPAGE
>  	bool "Transparent Hugepage Support"
> -	depends on X86 && MMU
> +	depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE
>  	select COMPACTION
>  	help
>  	  Transparent Hugepages allows the kernel to use huge pages and
> -- 
> 1.7.4.1
> 

-- 
Michal Hocko
SUSE Labs
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