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rcu: shrink rcutiny by making synchronize_rcu_bh() be inline

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Because synchronize_rcu_bh() is identical to synchronize_sched(),
make the former a static inline invoking the latter, saving the
overhead of an EXPORT_SYMBOL_GPL() and the duplicate code.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2010-03-30 15:46:01 -07:00
parent 32c141a0a1
commit da848c47bc
4 changed files with 15 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/rcupdate.h
View file

@ -56,8 +56,6 @@ struct rcu_head {
}; };
/* Exported common interfaces */ /* Exported common interfaces */
extern void synchronize_rcu_bh(void);
extern void synchronize_sched(void);
extern void rcu_barrier(void); extern void rcu_barrier(void);
extern void rcu_barrier_bh(void); extern void rcu_barrier_bh(void);
extern void rcu_barrier_sched(void); extern void rcu_barrier_sched(void);

12
include/linux/rcutiny.h
View file

@ -74,7 +74,17 @@ static inline void rcu_sched_force_quiescent_state(void)
{ {
} }
#define synchronize_rcu synchronize_sched extern void synchronize_sched(void);
static inline void synchronize_rcu(void)
{
synchronize_sched();
}
static inline void synchronize_rcu_bh(void)
{
synchronize_sched();
}
static inline void synchronize_rcu_expedited(void) static inline void synchronize_rcu_expedited(void)
{ {

2
include/linux/rcutree.h
View file

@ -86,6 +86,8 @@ static inline void __rcu_read_unlock_bh(void)
extern void call_rcu_sched(struct rcu_head *head, extern void call_rcu_sched(struct rcu_head *head,
void (*func)(struct rcu_head *rcu)); void (*func)(struct rcu_head *rcu));
extern void synchronize_rcu_bh(void);
extern void synchronize_sched(void);
extern void synchronize_rcu_expedited(void); extern void synchronize_rcu_expedited(void);
static inline void synchronize_rcu_bh_expedited(void) static inline void synchronize_rcu_bh_expedited(void)

9
kernel/rcutiny.c
View file

@ -187,7 +187,8 @@ static void rcu_process_callbacks(struct softirq_action *unused)
* *
* Cool, huh? (Due to Josh Triplett.) * Cool, huh? (Due to Josh Triplett.)
* *
* But we want to make this a static inline later. * But we want to make this a static inline later. The cond_resched()
* currently makes this problematic.
*/ */
void synchronize_sched(void) void synchronize_sched(void)
{ {
@ -195,12 +196,6 @@ void synchronize_sched(void)
} }
EXPORT_SYMBOL_GPL(synchronize_sched); EXPORT_SYMBOL_GPL(synchronize_sched);
void synchronize_rcu_bh(void)
{
synchronize_sched();
}
EXPORT_SYMBOL_GPL(synchronize_rcu_bh);
/* /*
* Helper function for call_rcu() and call_rcu_bh(). * Helper function for call_rcu() and call_rcu_bh().
*/ */