[RFC 02/11] mm: add pmd_mkclean()

[Ross Zwisler <ross.zwisler@linux.intel.com>]

Currently PMD pages can be dirtied via pmd_mkdirty(), but cannot be
cleaned.  For DAX mmap dirty page tracking we need to be able to clean PMD
pages when we flush them to media so that we get a new write fault the next
time the are written to.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
---
 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 867da5b..c548e4c 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -277,6 +277,11 @@ static inline pmd_t pmd_mkdirty(pmd_t pmd)
 	return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
 }
 
+static inline pmd_t pmd_mkclean(pmd_t pmd)
+{
+	return pmd_clear_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
+}
+
 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 {
 	return pmd_set_flags(pmd, _PAGE_PSE);
-- 
2.1.0

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