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

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 ---

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

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