[PATCH v4 08/16] sparc: add pmd_[dirty|mkclean] for THP

Minchan Kim
2015-11-20T08:06:31Z

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.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/sparc/include/asm/pgtable_64.h | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 131d36fcd07a..5833dc5ee7d7 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -717,6 +717,15 @@ 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));
--
1.9.1