| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_SCHED_RCUPDATE_WAIT_H |
| #define _LINUX_SCHED_RCUPDATE_WAIT_H |
| |
| /* |
| * RCU synchronization types and methods: |
| */ |
| |
| #include <linux/rcupdate.h> |
| #include <linux/completion.h> |
| |
| /* |
| * Structure allowing asynchronous waiting on RCU. |
| */ |
| struct rcu_synchronize { |
| struct rcu_head head; |
| struct completion completion; |
| }; |
| void wakeme_after_rcu(struct rcu_head *head); |
| |
| void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array, |
| struct rcu_synchronize *rs_array); |
| |
| #define _wait_rcu_gp(checktiny, ...) \ |
| do { \ |
| call_rcu_func_t __crcu_array[] = { __VA_ARGS__ }; \ |
| struct rcu_synchronize __rs_array[ARRAY_SIZE(__crcu_array)]; \ |
| __wait_rcu_gp(checktiny, ARRAY_SIZE(__crcu_array), \ |
| __crcu_array, __rs_array); \ |
| } while (0) |
| |
| #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 */ |