PVMW_MIGRATION
DEFINE_FOLIO_VMA_WALK(pvmw, rmap_walk_arg->folio, vma, addr, PVMW_SYNC | PVMW_MIGRATION);
if (pvmw->flags & PVMW_MIGRATION) {
!(pvmw->flags & PVMW_MIGRATION))
if (pvmw->flags & PVMW_MIGRATION)
is_migration = pvmw->flags & PVMW_MIGRATION;