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rcu: Abstract common code for RCU grace-period-wait primitives

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Pull the code that waits for an RCU grace period into a single function,
which is then called by synchronize_rcu() and friends in the case of
TREE_RCU and TREE_PREEMPT_RCU, and from rcu_barrier() and friends in
the case of TINY_RCU and TINY_PREEMPT_RCU.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2011-05-26 22:14:36 -07:00
parent f039d1f188
commit 2c42818e96
8 changed files with 113 additions and 131 deletions
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kernel/rcupdate.c
+20 -1
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@@ -94,11 +94,16 @@ 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 +111,20 @@ 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.