rndsource_cpu
rs->state = percpu_alloc(sizeof(struct rndsource_cpu));
percpu_free(rs->state, sizeof(struct rndsource_cpu));
struct rndsource_cpu *rc;
struct rndsource_cpu *rc = percpu_getref(rs->state);
struct rndsource_cpu *rc = ptr;
struct rndsource_cpu *rc = ptr;
rs->state = percpu_alloc(sizeof(struct rndsource_cpu));