From 65cfe3583b612a22e12fba9a7bbd2d37ca5ad941 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Sun, 1 Jul 2018 07:40:52 -0700 Subject: 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 --- include/linux/rcutiny.h | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'include/linux/rcutiny.h') diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h index bcfbc40a7239..ac26c27ccde8 100644 --- a/include/linux/rcutiny.h +++ b/include/linux/rcutiny.h @@ -56,19 +56,23 @@ static inline void cond_synchronize_sched(unsigned long oldstate) might_sleep(); } -extern void rcu_barrier_bh(void); -extern void rcu_barrier_sched(void); - static inline void synchronize_rcu_expedited(void) { synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ } +extern void rcu_barrier_sched(void); + static inline void rcu_barrier(void) { rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ } +static inline void rcu_barrier_bh(void) +{ + rcu_barrier(); +} + static inline void synchronize_rcu_bh(void) { synchronize_sched(); -- cgit v1.2.3