arch/x86/include/asm/rcu.h

#ifndef _ASM_X86_RCU_H
#define _ASM_X86_RCU_H

#ifndef __ASSEMBLY__

#include <linux/rcupdate.h>
#include <asm/ptrace.h>

static inline void exception_enter(struct pt_regs *regs)
{
	rcu_user_exit();
}

static inline void exception_exit(struct pt_regs *regs)
{
#ifdef CONFIG_RCU_USER_QS
	if (user_mode(regs))
		rcu_user_enter();
#endif
}

#else /* __ASSEMBLY__ */

#ifdef CONFIG_RCU_USER_QS
# define SCHEDULE_USER call schedule_user
#else
# define SCHEDULE_USER call schedule
#endif

#endif /* !__ASSEMBLY__ */

#endif