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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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7
include/linux/rcutree.h
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@ -45,14 +45,19 @@ static inline void rcu_virt_note_context_switch(int cpu)
rcu_note_context_switch(false);
}
void synchronize_rcu(void);
static inline void synchronize_rcu_bh(void)
{
synchronize_rcu();
}
void synchronize_sched_expedited(void);
void synchronize_rcu_expedited(void);
static inline void synchronize_sched_expedited(void)
{
synchronize_rcu_expedited();
}
void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
/**