/*
   * 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
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * 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 <dipankar@in.ibm.com>
   *	   Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm
   *
   * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
   * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
   *
   * For detailed explanation of Read-Copy Update mechanism see -

   *	Documentation/RCU

   */
  
  #ifndef __LINUX_RCUTREE_H
  #define __LINUX_RCUTREE_H

  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)
  {
  	rcu_note_context_switch(cpu);
  }

  #ifdef CONFIG_TREE_PREEMPT_RCU

  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)

  {

  	synchronize_sched_expedited();

  }

  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 */