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authorPaul E. McKenney <paulmck@kernel.org>2020-03-06 13:58:27 -0800
committerPaul E. McKenney <paulmck@kernel.org>2020-04-27 11:03:51 -0700
commitb3d73156b075014ce5b2609f4f47723d6c0c23d6 (patch)
treed8808db8a53a8a481e060231cdd59949eaca326b /include/linux/rcupdate_wait.h
parent07e105158d97b4969891e844f318d16f6cef566c (diff)
rcu: Reinstate synchronize_rcu_mult()
With the advent and likely usage of synchronize_rcu_rude(), there is again a need to wait on multiple types of RCU grace periods, for example, call_rcu_tasks() and call_rcu_tasks_rude(). This commit therefore reinstates synchronize_rcu_mult() in order to allow these grace periods to be straightforwardly waited on concurrently. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'include/linux/rcupdate_wait.h')
-rw-r--r--include/linux/rcupdate_wait.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/rcupdate_wait.h b/include/linux/rcupdate_wait.h
index c0578ba23c1a..699b938358bf 100644
--- a/include/linux/rcupdate_wait.h
+++ b/include/linux/rcupdate_wait.h
@@ -31,4 +31,23 @@ do { \
#define wait_rcu_gp(...) _wait_rcu_gp(false, __VA_ARGS__)
+/**
+ * synchronize_rcu_mult - Wait concurrently for multiple grace periods
+ * @...: List of call_rcu() functions for different grace periods to wait on
+ *
+ * This macro waits concurrently for multiple types of RCU grace periods.
+ * For example, synchronize_rcu_mult(call_rcu, call_rcu_tasks) would wait
+ * on concurrent RCU and RCU-tasks grace periods. Waiting on a given SRCU
+ * domain requires you to write a wrapper function for that SRCU domain's
+ * call_srcu() function, with this wrapper supplying the pointer to the
+ * corresponding srcu_struct.
+ *
+ * The first argument tells Tiny RCU's _wait_rcu_gp() not to
+ * bother waiting for RCU. The reason for this is because anywhere
+ * synchronize_rcu_mult() can be called is automatically already a full
+ * grace period.
+ */
+#define synchronize_rcu_mult(...) \
+ _wait_rcu_gp(IS_ENABLED(CONFIG_TINY_RCU), __VA_ARGS__)
+
#endif /* _LINUX_SCHED_RCUPDATE_WAIT_H */