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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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8
include/linux/rcutree.h
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@ -45,7 +45,11 @@ static inline void rcu_virt_note_context_switch(int cpu)
rcu_note_context_switch(false);
}
void synchronize_rcu_bh(void);
static inline void synchronize_rcu_bh(void)
{
synchronize_rcu();
}
void synchronize_sched_expedited(void);
void synchronize_rcu_expedited(void);
@ -69,7 +73,7 @@ void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
*/
static inline void synchronize_rcu_bh_expedited(void)
{
synchronize_sched_expedited();
synchronize_rcu_expedited();
}
void rcu_barrier(void);