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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-07-01 07:40:52 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-08-30 16:02:40 -0700
commit65cfe3583b612a22e12fba9a7bbd2d37ca5ad941 (patch)
tree66dcbed4b0f96f008ffdacd63f717ca4653f6b02 /include/linux/rcupdate.h
parentba1c64c27239373be1b3d88cf0a9ac1b10fa871f (diff)
rcu: Define RCU-bh update API in terms of RCU
Now that the main RCU API knows about softirq disabling and softirq's quiescent states, the RCU-bh update code can be dispensed with. This commit therefore removes the RCU-bh update-side implementation and defines RCU-bh's update-side API in terms of that of either RCU-preempt or RCU-sched, depending on the setting of the CONFIG_PREEMPT Kconfig option. In kernels built with CONFIG_RCU_NOCB_CPU=y this has the knock-on effect of reducing by one the number of rcuo kthreads per CPU. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 75e5b393cf44..9ebfd436cec7 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -55,11 +55,15 @@ void call_rcu(struct rcu_head *head, rcu_callback_t func);
#define call_rcu call_rcu_sched
#endif /* #else #ifdef CONFIG_PREEMPT_RCU */
-void call_rcu_bh(struct rcu_head *head, rcu_callback_t func);
void call_rcu_sched(struct rcu_head *head, rcu_callback_t func);
void synchronize_sched(void);
void rcu_barrier_tasks(void);
+static inline void call_rcu_bh(struct rcu_head *head, rcu_callback_t func)
+{
+ call_rcu(head, func);
+}
+
#ifdef CONFIG_PREEMPT_RCU
void __rcu_read_lock(void);
@@ -104,7 +108,6 @@ static inline int rcu_preempt_depth(void)
void rcu_init(void);
extern int rcu_scheduler_active __read_mostly;
void rcu_sched_qs(void);
-void rcu_bh_qs(void);
void rcu_check_callbacks(int user);
void rcu_report_dead(unsigned int cpu);
void rcutree_migrate_callbacks(int cpu);
@@ -326,8 +329,7 @@ static inline void rcu_preempt_sleep_check(void) { }
* and rcu_assign_pointer(). Some of these could be folded into their
* callers, but they are left separate in order to ease introduction of
* multiple flavors of pointers to match the multiple flavors of RCU
- * (e.g., __rcu_bh, * __rcu_sched, and __srcu), should this make sense in
- * the future.
+ * (e.g., __rcu_sched, and __srcu), should this make sense in the future.
*/
#ifdef __CHECKER__