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

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Date:	Thu, 13 Sep 2012 12:05:14 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Will Deacon <will.deacon@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, mhocko@...e.cz,
	Steve Capper <steve.capper@....com>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: Re: [PATCH 3/3] mm: Introduce HAVE_ARCH_TRANSPARENT_HUGEPAGE

On Tue, 11 Sep 2012 17:47:16 +0100
Will Deacon <will.deacon@....com> 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).
> 
> --- 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

We need to talk with Gerald concerning
http://ozlabs.org/~akpm/mmotm/broken-out/thp-x86-introduce-have_arch_transparent_hugepage.patch


I did this.  Please check.

From: Steve Capper <steve.capper@....com>
Subject: mm: introduce HAVE_ARCH_TRANSPARENT_HUGEPAGE

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>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Kirill A. Shutemov <kirill@...temov.name>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Gerald Schaefer <gerald.schaefer@...ibm.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 arch/x86/Kconfig |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff -puN arch/x86/Kconfig~mm-introduce-have_arch_transparent_hugepage arch/x86/Kconfig
--- a/arch/x86/Kconfig~mm-introduce-have_arch_transparent_hugepage
+++ a/arch/x86/Kconfig
@@ -83,7 +83,6 @@ config X86
 	select IRQ_FORCED_THREADING
 	select USE_GENERIC_SMP_HELPERS if SMP
 	select HAVE_BPF_JIT if X86_64
-	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	select CLKEVT_I8253
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select GENERIC_IOMAP
@@ -1330,6 +1329,10 @@ 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

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