On Tue, Apr 30, 2013 at 05:30:48PM +0100, Steve Capper wrote: > Bring Transparent HugePage support to ARM. The size of a > transparent huge page depends on the normal page size. A > transparent huge page is always represented as a pmd. > > If PAGE_SIZE is 4K, THPs are 2MB. > If PAGE_SIZE is 64K, THPs are 512MB. > > Signed-off-by: Steve Capper <steve.capper@xxxxxxxxxx> > --- > arch/arm64/Kconfig | 3 +++ > arch/arm64/include/asm/pgtable-hwdef.h | 1 + > arch/arm64/include/asm/pgtable.h | 47 ++++++++++++++++++++++++++++++++++ > arch/arm64/include/asm/tlb.h | 6 +++++ > arch/arm64/include/asm/tlbflush.h | 2 ++ > 5 files changed, 59 insertions(+) > [ ... ] > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index 4b7a058..06bfbd6 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h [ ... ] > +#define pmd_modify(pmd,newprot) (__pmd(pmd_val(pmd) | pgprot_val(newprot))) > +#define set_pmd_at(mm, addr, pmdp, pmd) set_pmd(pmdp, pmd) Apologies, I have over-simplified (and broke) pmd_modify whilst tidying up this patch. It should mask off certain bits. I will send out a correction once PROT_NONE support has been sorted as this will affect this code path too. -- Steve -- 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>