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  1. /*
  2.  * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
  3.  *
  4.  * This program is free software; you can redistribute it and/or modify
  5.  * it under the terms of the GNU General Public License as published by
  6.  * the Free Software Foundation; either version 2 of the License, or
  7.  * (at your option) any later version.
  8.  *
  9.  * This program is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12.  * GNU General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU General Public License
  15.  * along with this program; if not, you can access it online at
  16.  * http://www.gnu.org/licenses/gpl-2.0.html.
  17.  *
  18.  * Copyright IBM Corporation, 2008
  19.  *
  20.  * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
  21.  *
  22.  * For detailed explanation of Read-Copy Update mechanism see -
  23.  *              Documentation/RCU
  24.  */
  25. #ifndef __LINUX_TINY_H
  26. #define __LINUX_TINY_H
  27.  
  28. #include <linux/cache.h>
  29.  
  30. static inline unsigned long get_state_synchronize_rcu(void)
  31. {
  32.         return 0;
  33. }
  34.  
  35. static inline void cond_synchronize_rcu(unsigned long oldstate)
  36. {
  37.         might_sleep();
  38. }
  39.  
  40. static inline void rcu_barrier_bh(void)
  41. {
  42.         wait_rcu_gp(call_rcu_bh);
  43. }
  44.  
  45. static inline void rcu_barrier_sched(void)
  46. {
  47.         wait_rcu_gp(call_rcu_sched);
  48. }
  49.  
  50. static inline void synchronize_rcu_expedited(void)
  51. {
  52.         synchronize_sched();    /* Only one CPU, so pretty fast anyway!!! */
  53. }
  54.  
  55. static inline void rcu_barrier(void)
  56. {
  57.         rcu_barrier_sched();  /* Only one CPU, so only one list of callbacks! */
  58. }
  59.  
  60. static inline void synchronize_rcu_bh(void)
  61. {
  62.         synchronize_sched();
  63. }
  64.  
  65. static inline void synchronize_rcu_bh_expedited(void)
  66. {
  67.         synchronize_sched();
  68. }
  69.  
  70. static inline void synchronize_sched_expedited(void)
  71. {
  72.         synchronize_sched();
  73. }
  74.  
  75. static inline void kfree_call_rcu(struct rcu_head *head,
  76.                                   void (*func)(struct rcu_head *rcu))
  77. {
  78.         call_rcu(head, func);
  79. }
  80.  
  81. static inline void rcu_note_context_switch(void)
  82. {
  83.         rcu_sched_qs();
  84. }
  85.  
  86. /*
  87.  * Take advantage of the fact that there is only one CPU, which
  88.  * allows us to ignore virtualization-based context switches.
  89.  */
  90. static inline void rcu_virt_note_context_switch(int cpu)
  91. {
  92. }
  93.  
  94. /*
  95.  * Return the number of grace periods.
  96.  */
  97. static inline long rcu_batches_completed(void)
  98. {
  99.         return 0;
  100. }
  101.  
  102. /*
  103.  * Return the number of bottom-half grace periods.
  104.  */
  105. static inline long rcu_batches_completed_bh(void)
  106. {
  107.         return 0;
  108. }
  109.  
  110. static inline void rcu_force_quiescent_state(void)
  111. {
  112. }
  113.  
  114. static inline void rcu_bh_force_quiescent_state(void)
  115. {
  116. }
  117.  
  118. static inline void rcu_sched_force_quiescent_state(void)
  119. {
  120. }
  121.  
  122. static inline void show_rcu_gp_kthreads(void)
  123. {
  124. }
  125.  
  126. static inline void rcu_cpu_stall_reset(void)
  127. {
  128. }
  129.  
  130. static inline void exit_rcu(void)
  131. {
  132. }
  133.  
  134. #ifdef CONFIG_DEBUG_LOCK_ALLOC
  135. extern int rcu_scheduler_active __read_mostly;
  136. void rcu_scheduler_starting(void);
  137. #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
  138. static inline void rcu_scheduler_starting(void)
  139. {
  140. }
  141. #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
  142.  
  143. #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE)
  144.  
  145. static inline bool rcu_is_watching(void)
  146. {
  147.         return __rcu_is_watching();
  148. }
  149.  
  150. #else /* defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */
  151.  
  152. static inline bool rcu_is_watching(void)
  153. {
  154.         return true;
  155. }
  156.  
  157.  
  158. #endif /* #else defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */
  159.  
  160. #endif /* __LINUX_RCUTINY_H */
  161.