DM_CLONE_HYDRATION_SUSPENDED
while (likely(!test_bit(DM_CLONE_HYDRATION_SUSPENDED, &clone->flags)) &&
__set_bit(DM_CLONE_HYDRATION_SUSPENDED, &clone->flags);
set_bit(DM_CLONE_HYDRATION_SUSPENDED, &clone->flags);
clear_bit(DM_CLONE_HYDRATION_SUSPENDED, &clone->flags);