diff options
Diffstat (limited to 'kernel/rcupdate.c')
| -rw-r--r-- | kernel/rcupdate.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c index ddddb320be6..c5b98e565ae 100644 --- a/kernel/rcupdate.c +++ b/kernel/rcupdate.c @@ -43,9 +43,14 @@ #include <linux/notifier.h> #include <linux/cpu.h> #include <linux/mutex.h> -#include <linux/module.h> +#include <linux/export.h> #include <linux/hardirq.h> +#define CREATE_TRACE_POINTS +#include <trace/events/rcu.h> + +#include "rcu.h" + #ifdef CONFIG_DEBUG_LOCK_ALLOC static struct lock_class_key rcu_lock_key; struct lockdep_map rcu_lock_map = @@ -94,11 +99,16 @@ EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held); #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ +struct rcu_synchronize { + struct rcu_head head; + struct completion completion; +}; + /* * Awaken the corresponding synchronize_rcu() instance now that a * grace period has elapsed. */ -void wakeme_after_rcu(struct rcu_head *head) +static void wakeme_after_rcu(struct rcu_head *head) { struct rcu_synchronize *rcu; @@ -106,6 +116,20 @@ void wakeme_after_rcu(struct rcu_head *head) complete(&rcu->completion); } +void wait_rcu_gp(call_rcu_func_t crf) +{ + struct rcu_synchronize rcu; + + init_rcu_head_on_stack(&rcu.head); + init_completion(&rcu.completion); + /* Will wake me after RCU finished. */ + crf(&rcu.head, wakeme_after_rcu); + /* Wait for it. */ + wait_for_completion(&rcu.completion); + destroy_rcu_head_on_stack(&rcu.head); +} +EXPORT_SYMBOL_GPL(wait_rcu_gp); + #ifdef CONFIG_PROVE_RCU /* * wrapper function to avoid #include problems. |