PGTBL_PMD_MODIFIED
#define ARCH_PAGE_TABLE_SYNC_MASK PGTBL_PMD_MODIFIED
#define ARCH_PAGE_TABLE_SYNC_MASK PGTBL_PMD_MODIFIED
#define ARCH_PAGE_TABLE_SYNC_MASK PGTBL_PMD_MODIFIED
(__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
*mask |= PGTBL_PMD_MODIFIED;
*mask |= PGTBL_PMD_MODIFIED;