MIGRATE_PFN_WRITE 2276 mm/migrate.c   				mpfn |= MIGRATE_PFN_WRITE;
MIGRATE_PFN_WRITE 2286 mm/migrate.c   			mpfn |= pte_write(pte) ? MIGRATE_PFN_WRITE : 0;
MIGRATE_PFN_WRITE 2320 mm/migrate.c   						     MIGRATE_PFN_WRITE);