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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-07-03 00:30:37 +0300
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-08-31 02:02:45 +0300
commit45975c7d21a1c0aba97e3d8007e2a7c123145748 (patch)
tree2fb06e198ccf2f551f0dc5f25b5c683076baaf1f /include/linux/rcutiny.h
parent4cf439a200fd621f838270c36c853407a934bcb5 (diff)
downloadlinux-45975c7d21a1c0aba97e3d8007e2a7c123145748.tar.xz
rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds
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>
Diffstat (limited to 'include/linux/rcutiny.h')
-rw-r--r--include/linux/rcutiny.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
index ac26c27ccde8..df2c0895c5e7 100644
--- a/include/linux/rcutiny.h
+++ b/include/linux/rcutiny.h
@@ -36,6 +36,11 @@ static inline int rcu_dynticks_snap(struct rcu_dynticks *rdtp)
/* Never flag non-existent other CPUs! */
static inline bool rcu_eqs_special_set(int cpu) { return false; }
+static inline void synchronize_rcu(void)
+{
+ synchronize_sched();
+}
+
static inline unsigned long get_state_synchronize_rcu(void)
{
return 0;
@@ -94,6 +99,8 @@ static inline void kfree_call_rcu(struct rcu_head *head,
call_rcu(head, func);
}
+void rcu_sched_qs(void);
+
static inline void rcu_softirq_qs(void)
{
rcu_sched_qs();