rcu: create rcu_my_thread_group_empty() wrapper
Some RCU-lockdep splat repairs need to know whether they are running in a single-threaded process. Unfortunately, the thread_group_empty() primitive is defined in sched.h, and can induce #include hell. This commit therefore introduces a rcu_my_thread_group_empty() wrapper that is defined in rcupdate.c, thus avoiding the need to include sched.h everywhere. Signed-off-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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@ -190,6 +190,8 @@ static inline int rcu_read_lock_sched_held(void)
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#ifdef CONFIG_PROVE_RCU
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extern int rcu_my_thread_group_empty(void);
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/**
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* rcu_dereference_check - rcu_dereference with debug checking
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* @p: The pointer to read, prior to dereferencing
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@ -122,3 +122,14 @@ void wakeme_after_rcu(struct rcu_head *head)
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rcu = container_of(head, struct rcu_synchronize, head);
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complete(&rcu->completion);
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}
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#ifdef CONFIG_PROVE_RCU
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/*
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* wrapper function to avoid #include problems.
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*/
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int rcu_my_thread_group_empty(void)
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{
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return thread_group_empty(current);
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}
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EXPORT_SYMBOL_GPL(rcu_my_thread_group_empty);
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#endif /* #ifdef CONFIG_PROVE_RCU */
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