| /* |
| * 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, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| * 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> |
| |
| void rcu_sched_qs(int cpu); |
| void rcu_bh_qs(int cpu); |
| |
| #define __rcu_read_lock() preempt_disable() |
| #define __rcu_read_unlock() preempt_enable() |
| #define __rcu_read_lock_bh() local_bh_disable() |
| #define __rcu_read_unlock_bh() local_bh_enable() |
| #define call_rcu_sched call_rcu |
| |
| #define rcu_init_sched() do { } while (0) |
| extern void rcu_check_callbacks(int cpu, int user); |
| |
| static inline int rcu_needs_cpu(int cpu) |
| { |
| return 0; |
| } |
| |
| /* |
| * Return the number of grace periods. |
| */ |
| static inline long rcu_batches_completed(void) |
| { |
| return 0; |
| } |
| |
| /* |
| * Return the number of bottom-half grace periods. |
| */ |
| static inline long rcu_batches_completed_bh(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) |
| { |
| } |
| |
| #define synchronize_rcu synchronize_sched |
| |
| static inline void synchronize_rcu_expedited(void) |
| { |
| synchronize_sched(); |
| } |
| |
| static inline void synchronize_rcu_bh_expedited(void) |
| { |
| synchronize_sched(); |
| } |
| |
| struct notifier_block; |
| |
| #ifdef CONFIG_NO_HZ |
| |
| extern void rcu_enter_nohz(void); |
| extern void rcu_exit_nohz(void); |
| |
| #else /* #ifdef CONFIG_NO_HZ */ |
| |
| static inline void rcu_enter_nohz(void) |
| { |
| } |
| |
| static inline void rcu_exit_nohz(void) |
| { |
| } |
| |
| #endif /* #else #ifdef CONFIG_NO_HZ */ |
| |
| static inline void exit_rcu(void) |
| { |
| } |
| |
| static inline int rcu_preempt_depth(void) |
| { |
| return 0; |
| } |
| |
| #endif /* __LINUX_RCUTINY_H */ |