[PATCH v5 07/11] mm: soft-dirty: keep soft-dirty bits over thp migration

From: Naoya Horiguchi Soft dirty bit is designed to keep tracked over page migration. This patch makes it work in the same manner for thp migration too. --- ChangeLog v1 -> v2: - separate diff moving _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1 - clear_soft_dirty_pmd can

[PATCH v5 07/11] mm: soft-dirty: keep soft-dirty bits over thp migration

From: Naoya Horiguchi Soft dirty bit is designed to keep tracked over page migration. This patch makes it work in the same manner for thp migration too. --- ChangeLog v1 -> v2: - separate diff moving _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1 - clear_soft_dirty_pmd can handle migration entry