[RFC PATCH 9/9] ARM64: mm: THP support.
From: Steve Capper <hidden>
Date: 2013-05-01 14:16:22
Also in:
linux-arch, linux-mm
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 <redacted> --- 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(+)
[ ... ]
quoted hunk ↗ jump to hunk
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