[PATCH v7 02/10] mm: x86: move _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1

From: Naoya Horiguchi _PAGE_PSE is used to distinguish between a truly non-present (_PAGE_PRESENT=0) PMD, and a PMD which is undergoing a THP split and should be treated as present. But _PAGE_SWP_SOFT_DIRTY currently uses the _PAGE_PSE bit, which would cause confusion

[PATCH v7 02/10] mm: x86: move _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1

From: Naoya Horiguchi _PAGE_PSE is used to distinguish between a truly non-present (_PAGE_PRESENT=0) PMD, and a PMD which is undergoing a THP split and should be treated as present. But _PAGE_SWP_SOFT_DIRTY currently uses the _PAGE_PSE bit, which would cause confusion between one of those PMDs