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rcu: Define RCU-bh update API in terms of RCU

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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>
This commit is contained in:
Paul E. McKenney 2018-07-01 07:40:52 -07:00
parent ba1c64c272
commit 65cfe3583b
7 changed files with 48 additions and 194 deletions
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10
include/linux/rcutiny.h
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@ -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();