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/*
* 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);
#ifdef CONFIG_TINY_RCU
#define __rcu_read_lock() preempt_disable()
#define __rcu_read_unlock() preempt_enable()
#else /* #ifdef CONFIG_TINY_RCU */
void __rcu_read_lock(void);
void __rcu_read_unlock(void);
#endif /* #else #ifdef CONFIG_TINY_RCU */
#define __rcu_read_lock_bh() local_bh_disable()
#define __rcu_read_unlock_bh() local_bh_enable()
extern void call_rcu_sched(struct rcu_head *head,
void (*func)(struct rcu_head *rcu));
#define rcu_init_sched() do { } while (0)
extern void synchronize_sched(void);
#ifdef CONFIG_TINY_RCU
#define call_rcu call_rcu_sched
static inline void synchronize_rcu(void)
{
synchronize_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! */
}
#else /* #ifdef CONFIG_TINY_RCU */
void synchronize_rcu(void);
void rcu_barrier(void);
void synchronize_rcu_expedited(void);
#endif /* #else #ifdef CONFIG_TINY_RCU */
static inline void synchronize_rcu_bh(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 */
#ifdef CONFIG_TINY_RCU
static inline void rcu_preempt_note_context_switch(void)
{
}
static inline void exit_rcu(void)
{
}
static inline int rcu_needs_cpu(int cpu)
{
return 0;
}
static inline int rcu_preempt_depth(void)
{
return 0;
}
#else /* #ifdef CONFIG_TINY_RCU */
void rcu_preempt_note_context_switch(void);
extern void exit_rcu(void);
int rcu_preempt_needs_cpu(void);
static inline int rcu_needs_cpu(int cpu)
{
return rcu_preempt_needs_cpu();
}
/*
* Defined as macro as it is a very low level header
* included from areas that don't even know about current
* FIXME: combine with include/linux/rcutree.h into rcupdate.h.
*/
#define rcu_preempt_depth() (current->rcu_read_lock_nesting)
#endif /* #else #ifdef CONFIG_TINY_RCU */
static inline void rcu_note_context_switch(int cpu)
{
rcu_sched_qs(cpu);
rcu_preempt_note_context_switch();
}
extern void rcu_check_callbacks(int cpu, int user);
/*
* 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)
{
}
#ifdef CONFIG_DEBUG_LOCK_ALLOC
extern int rcu_scheduler_active __read_mostly;
extern 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 */
#endif /* __LINUX_RCUTINY_H */
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