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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>
alistair/sunxi64-5.8
Paul E. McKenney 2020-03-06 13:58:27 -08:00
parent 07e105158d
commit b3d73156b0
1 changed files with 19 additions and 0 deletions
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19
include/linux/rcupdate_wait.h
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@ -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 */