Kernel  |  3.3

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 * Read-Copy Update mechanism for mutual exclusion (tree-based version)
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * Copyright IBM Corporation, 2008
 * Author: Dipankar Sarma <>
 *	   Paul E. McKenney <> Hierarchical algorithm
 * Based on the original work by Paul McKenney <>
 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
 * For detailed explanation of Read-Copy Update mechanism see -
 *	Documentation/RCU


extern void rcu_init(void);
extern void rcu_note_context_switch(int cpu);
extern int rcu_needs_cpu(int cpu);
extern void rcu_cpu_stall_reset(void);

 * Note a virtualization-based context switch.  This is simply a
 * wrapper around rcu_note_context_switch(), which allows TINY_RCU
 * to save a few bytes.
static inline void rcu_virt_note_context_switch(int cpu)


extern void exit_rcu(void);

#else /* #ifdef CONFIG_TREE_PREEMPT_RCU */

static inline void exit_rcu(void)

#endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */

extern void synchronize_rcu_bh(void);
extern void synchronize_sched_expedited(void);
extern void synchronize_rcu_expedited(void);

static inline void synchronize_rcu_bh_expedited(void)

extern void rcu_barrier(void);
extern void rcu_barrier_bh(void);
extern void rcu_barrier_sched(void);

extern unsigned long rcutorture_testseq;
extern unsigned long rcutorture_vernum;
extern long rcu_batches_completed(void);
extern long rcu_batches_completed_bh(void);
extern long rcu_batches_completed_sched(void);

extern void rcu_force_quiescent_state(void);
extern void rcu_bh_force_quiescent_state(void);
extern void rcu_sched_force_quiescent_state(void);

/* A context switch is a grace period for RCU-sched and RCU-bh. */
static inline int rcu_blocking_is_gp(void)
	return num_online_cpus() == 1;

extern void rcu_scheduler_starting(void);
extern int rcu_scheduler_active __read_mostly;

#endif /* __LINUX_RCUTREE_H */