Commit b3d73156 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 07e10515

include/linux/rcupdate_wait.h

+19 −0
Original line number Diff line number Diff line
@@ -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 */

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