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Merge branches 'barrier.2012.05.09a', 'fixes.2012.04.26a', 'inline.2012.05.02b' and 'srcu.2012.05.07b' into HEAD

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barrier:  Reduce the amount of disturbance by rcu_barrier() to the rest of
    	the system.  This branch also includes improvements to
    	RCU_FAST_NO_HZ, which are included here due to conflicts.
fixes:  Miscellaneous fixes.
inline:  Remaining changes from an abortive attempt to inline
    	preemptible RCU's __rcu_read_lock().  These are (1) making
    	exit_rcu() avoid unnecessary work and (2) avoiding having
    	preemptible RCU record a blocked thread when the scheduler
    	declines to do a context switch.
srcu:	Lai Jiangshan's algorithmic implementation of SRCU, including
    	call_srcu().
This commit is contained in:
Paul E. McKenney 2012-05-11 10:14:09 -07:00
commit dc36be4419
21 changed files with 1035 additions and 237 deletions
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19
include/linux/rcutree.h
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@ -45,18 +45,6 @@ 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);
@ -98,13 +86,6 @@ 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)
{
might_sleep(); /* Check for RCU read-side critical section. */
return num_online_cpus() == 1;
}
extern void rcu_scheduler_starting(void);
extern int rcu_scheduler_active __read_mostly;