linux_kernel/tools/lib/lockdep/uinclude/linux/rcu.h

#ifndef _LIBLOCKDEP_RCU_H_
#define _LIBLOCKDEP_RCU_H_

int rcu_scheduler_active;

static inline int rcu_lockdep_current_cpu_online(void)
{
	return 1;
}

static inline int rcu_is_cpu_idle(void)
{
	return 1;
}

static inline bool rcu_is_watching(void)
{
	return false;
}

#endif