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    Subject[PATCH v17 3/7] sparc: add pmd_[dirty|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_dirty and pmd_mkclean for THP page MADV_FREE
    support.

    Acked-by: David S. Miller <davem@davemloft.net>
    Cc: sparclinux@vger.kernel.org
    Signed-off-by: Minchan Kim <minchan@kernel.org>
    ---
    arch/sparc/include/asm/pgtable_64.h | 16 ++++++++++++++++
    1 file changed, 16 insertions(+)

    diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
    index 3770bf5c6e1b..b80a309d7e00 100644
    --- a/arch/sparc/include/asm/pgtable_64.h
    +++ b/arch/sparc/include/asm/pgtable_64.h
    @@ -666,6 +666,13 @@ static inline unsigned long pmd_young(pmd_t pmd)
    return pte_young(pte);
    }

    +static inline int pmd_dirty(pmd_t pmd)
    +{
    + pte_t pte = __pte(pmd_val(pmd));
    +
    + return pte_dirty(pte);
    +}
    +
    static inline unsigned long pmd_write(pmd_t pmd)
    {
    pte_t pte = __pte(pmd_val(pmd));
    @@ -723,6 +730,15 @@ static inline pmd_t pmd_mkdirty(pmd_t pmd)
    return __pmd(pte_val(pte));
    }

    +static inline pmd_t pmd_mkclean(pmd_t pmd)
    +{
    + pte_t pte = __pte(pmd_val(pmd));
    +
    + pte = pte_mkclean(pte);
    +
    + return __pmd(pte_val(pte));
    +}
    +
    static inline pmd_t pmd_mkyoung(pmd_t pmd)
    {
    pte_t pte = __pte(pmd_val(pmd));
    --
    2.0.0


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