[PATCH v2 08/13] x86: add pmd_[dirty|mkclean] for THP

From: Minchan Kim
Date: Tue Nov 03 2015 - 20:26:52 EST

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

Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
arch/x86/include/asm/pgtable.h | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 867da5bbb4a3..b964d54300e1 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -267,6 +267,11 @@ static inline pmd_t pmd_mkold(pmd_t pmd)
return pmd_clear_flags(pmd, _PAGE_ACCESSED);

+static inline pmd_t pmd_mkclean(pmd_t pmd)
+ return pmd_clear_flags(pmd, _PAGE_DIRTY);
static inline pmd_t pmd_wrprotect(pmd_t pmd)
return pmd_clear_flags(pmd, _PAGE_RW);

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/