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    Subject[PATCH v5 11/12] arm64: add pmd_mkclean for THP
    Date
    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_mkclean for THP page MADV_FREE support.

    Signed-off-by: Minchan Kim <minchan@kernel.org>
    ---
    arch/arm64/include/asm/pgtable.h | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
    index d2a1879b466b..fab3ddb30df7 100644
    --- a/arch/arm64/include/asm/pgtable.h
    +++ b/arch/arm64/include/asm/pgtable.h
    @@ -340,6 +340,7 @@ static inline pgprot_t mk_sect_prot(pgprot_t prot)
    #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(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))
    --
    1.9.1


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