SRCU_SIZE_ALLOC
if (ss_state == SRCU_SIZE_ALLOC)
sup->srcu_size_state = SRCU_SIZE_ALLOC;
WRITE_ONCE(ssp->srcu_sup->srcu_size_state, SRCU_SIZE_ALLOC);
smp_store_release(&ssp->srcu_sup->srcu_size_state, SRCU_SIZE_ALLOC);