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rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds

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Now that RCU-preempt knows about preemption disabling, its implementation
of synchronize_rcu() works for synchronize_sched(), and likewise for the
other RCU-sched update-side API members.  This commit therefore confines
the RCU-sched update-side code to CONFIG_PREEMPT=n builds, and defines
RCU-sched's update-side API members in terms of those of RCU-preempt.

This means that any given build of the Linux kernel has only one
update-side flavor of RCU, namely RCU-preempt for CONFIG_PREEMPT=y builds
and RCU-sched for CONFIG_PREEMPT=n builds.  This in turn means that kernels
built with CONFIG_RCU_NOCB_CPU=y have only one rcuo kthread per CPU.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Paul E. McKenney 2018-07-02 14:30:37 -07:00
parent 4cf439a200
commit 45975c7d21
7 changed files with 307 additions and 479 deletions
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14
include/linux/rcupdate.h
View file

@ -49,11 +49,11 @@
/* Exported common interfaces */
#ifdef CONFIG_PREEMPT_RCU
void call_rcu(struct rcu_head *head, rcu_callback_t func);
#else /* #ifdef CONFIG_PREEMPT_RCU */
#ifdef CONFIG_TINY_RCU
#define call_rcu call_rcu_sched
#endif /* #else #ifdef CONFIG_PREEMPT_RCU */
#else
void call_rcu(struct rcu_head *head, rcu_callback_t func);
#endif
void call_rcu_sched(struct rcu_head *head, rcu_callback_t func);
void synchronize_sched(void);
@ -92,11 +92,6 @@ static inline void __rcu_read_unlock(void)
preempt_enable();
}
static inline void synchronize_rcu(void)
{
synchronize_sched();
}
static inline int rcu_preempt_depth(void)
{
return 0;
@ -107,7 +102,6 @@ static inline int rcu_preempt_depth(void)
/* Internal to kernel */
void rcu_init(void);
extern int rcu_scheduler_active __read_mostly;
void rcu_sched_qs(void);
void rcu_check_callbacks(int user);
void rcu_report_dead(unsigned int cpu);
void rcutree_migrate_callbacks(int cpu);