Re: [PATCH v10 6/7] ARM: add pmd_[dirty|mkclean] for THP
From: Steve Capper <hidden>
Date: 2014-07-07 09:23:03
Also in:
linux-arm-kernel, linux-mm, lkml
On Mon, Jul 07, 2014 at 09:53:57AM +0900, Minchan Kim wrote:
quoted hunk ↗ jump to hunk
MADV_FREE needs pmd_dirty and pmd_mkclean for detecting recent overwrite of the contents since MADV_FREE syscall is called for THP page. This patch adds pmd_dirty and pmd_mkclean for THP page MADV_FREE support. Cc: Catalin Marinas <redacted> Cc: Will Deacon <redacted> Cc: Steve Capper <redacted> Cc: Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org> Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Signed-off-by: Minchan Kim <redacted> --- arch/arm64/include/asm/pgtable.h | 2 ++ 1 file changed, 2 insertions(+)diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 579702086488..f3ec01cef04f 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h@@ -240,10 +240,12 @@ static inline pmd_t pte_pmd(pte_t pte) #endif #define pmd_young(pmd) pte_young(pmd_pte(pmd)) +#define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd)) #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd))) #define pmd_mksplitting(pmd) pte_pmd(pte_mkspecial(pmd_pte(pmd))) #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd))) #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd))) +#define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd))) #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd))) #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd))) #define pmd_mknotpresent(pmd) (__pmd(pmd_val(pmd) & ~PMD_TYPE_MASK))-- 2.0.0
Hi Minchan, This looks good to me too. As Will said this applies to arm64, we will also need a version for: arch/arm/include/asm/pgtable-3level.h. Is there a testcase we can run to check that this patch set is working well for arm/arm64? Cheers, -- Steve