MBE_REUSABLE_B
set_bit(MBE_REUSABLE_B, &ce->e_flags);
clear_bit(MBE_REUSABLE_B, &ce->e_flags);
set_bit(MBE_REUSABLE_B, &entry->e_flags);
test_bit(MBE_REUSABLE_B, &entry->e_flags) &&