On Tue, 11 Sep 2012 17:47:16 +0100 Will Deacon <will.deacon@xxxxxxx> wrote: > From: Steve Capper <steve.capper@xxxxxxx> > > 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@xxxxxxx> 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@xxxxxxx> Signed-off-by: Will Deacon <will.deacon@xxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxx> Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>