/*
   * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
   *
   * 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, you can access it online at
   * http://www.gnu.org/licenses/gpl-2.0.html.

   *
   * Copyright IBM Corporation, 2008
   *
   * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
   *
   * For detailed explanation of Read-Copy Update mechanism see -

   *		Documentation/RCU

   */

  #ifndef __LINUX_TINY_H
  #define __LINUX_TINY_H
  
  #include <linux/cache.h>

  static inline unsigned long get_state_synchronize_rcu(void)
  {
  	return 0;
  }
  
  static inline void cond_synchronize_rcu(unsigned long oldstate)
  {
  	might_sleep();
  }

  static inline unsigned long get_state_synchronize_sched(void)
  {
  	return 0;
  }
  
  static inline void cond_synchronize_sched(unsigned long oldstate)
  {
  	might_sleep();
  }

  static inline void rcu_barrier_bh(void)
  {
  	wait_rcu_gp(call_rcu_bh);
  }
  
  static inline void rcu_barrier_sched(void)
  {
  	wait_rcu_gp(call_rcu_sched);
  }

  static inline void synchronize_rcu_expedited(void)

  {

  	synchronize_sched();	/* Only one CPU, so pretty fast anyway!!! */

  }

  static inline void rcu_barrier(void)

  {

  	rcu_barrier_sched();  /* Only one CPU, so only one list of callbacks! */

  }

  static inline void synchronize_rcu_bh(void)

  {
  	synchronize_sched();
  }
  
  static inline void synchronize_rcu_bh_expedited(void)
  {
  	synchronize_sched();
  }

  static inline void synchronize_sched_expedited(void)
  {
  	synchronize_sched();
  }

  static inline void kfree_call_rcu(struct rcu_head *head,

  				  rcu_callback_t func)

  {
  	call_rcu(head, func);
  }

  static inline void rcu_note_context_switch(void)

  {

  	rcu_sched_qs();

  }

  /*

   * Take advantage of the fact that there is only one CPU, which
   * allows us to ignore virtualization-based context switches.
   */
  static inline void rcu_virt_note_context_switch(int cpu)
  {
  }
  
  /*

   * Return the number of grace periods started.

   */

  static inline unsigned long rcu_batches_started(void)

  {
  	return 0;
  }
  
  /*

   * Return the number of bottom-half grace periods started.

   */

  static inline unsigned long rcu_batches_started_bh(void)
  {
  	return 0;
  }
  
  /*
   * Return the number of sched grace periods started.
   */
  static inline unsigned long rcu_batches_started_sched(void)
  {
  	return 0;
  }
  
  /*
   * Return the number of grace periods completed.

   */

  static inline unsigned long rcu_batches_completed(void)

  {
  	return 0;
  }
  
  /*

   * Return the number of bottom-half grace periods completed.

   */

  static inline unsigned long rcu_batches_completed_bh(void)

  {
  	return 0;
  }

  /*

   * Return the number of sched grace periods completed.

   */
  static inline unsigned long rcu_batches_completed_sched(void)

  {
  	return 0;
  }
  
  static inline void rcu_force_quiescent_state(void)
  {
  }
  
  static inline void rcu_bh_force_quiescent_state(void)
  {
  }
  
  static inline void rcu_sched_force_quiescent_state(void)
  {
  }

  static inline void show_rcu_gp_kthreads(void)
  {
  }

  static inline void rcu_cpu_stall_reset(void)
  {
  }

  static inline void rcu_idle_enter(void)
  {
  }
  
  static inline void rcu_idle_exit(void)
  {
  }
  
  static inline void rcu_irq_enter(void)
  {
  }
  
  static inline void rcu_irq_exit(void)
  {
  }

  static inline void exit_rcu(void)
  {
  }

  #ifdef CONFIG_DEBUG_LOCK_ALLOC

  extern int rcu_scheduler_active __read_mostly;

  void rcu_scheduler_starting(void);

  #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */

  static inline void rcu_scheduler_starting(void)
  {
  }

  #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */

  #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE)

  static inline bool rcu_is_watching(void)

  {

  	return __rcu_is_watching();

  }

  #else /* defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */
  
  static inline bool rcu_is_watching(void)
  {
  	return true;
  }

  #endif /* #else defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */

  static inline void rcu_all_qs(void)
  {

  	barrier(); /* Avoid RCU read-side critical sections leaking across. */

  }

  #endif /* __LINUX_RCUTINY_H */