LRU_REFS_FLAGS
set_mask_bits(&folio->flags.f, LRU_REFS_FLAGS | BIT(PG_workingset), 0);
new_flags = old_flags & ~(LRU_GEN_MASK | LRU_REFS_FLAGS);
new_flags = old_flags & ~(LRU_GEN_MASK | LRU_REFS_FLAGS);
set_mask_bits(&folio->flags.f, LRU_REFS_FLAGS, BIT(PG_active));
set_mask_bits(&folio->flags.f, LRU_REFS_FLAGS, BIT(PG_workingset));