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_PAGE_CHG_MASK is defined as the set of bits not updated by pte_modify(); specifically, the pfn itself, and the Accessed and Dirty bits (which are updated by hardware). Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Tested-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>