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SubjectRe: [PATCH 3/3] mm: Introduce HAVE_ARCH_TRANSPARENT_HUGEPAGE
On Tue, 11 Sep 2012 17:47:16 +0100
Will Deacon <will.deacon@arm.com> wrote:

> From: Steve Capper <steve.capper@arm.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@arm.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@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-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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