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Commit ee84b824 authored May 06, 2010 by Paul E. McKenney

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>

parent ad4ba375

include/linux/rcupdate.h

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -190,6 +190,8 @@ static inline int rcu_read_lock_sched_held(void)

	#ifdef CONFIG_PROVE_RCU		#ifdef CONFIG_PROVE_RCU

			extern int rcu_my_thread_group_empty(void);

	/**		/**
	* rcu_dereference_check - rcu_dereference with debug checking		* rcu_dereference_check - rcu_dereference with debug checking
	* @p: The pointer to read, prior to dereferencing		* @p: The pointer to read, prior to dereferencing

kernel/rcupdate.c

+11 −0

Original line number	Original line	Diff line number	Diff line
	@@ -122,3 +122,14 @@ void wakeme_after_rcu(struct rcu_head *head)
	rcu = container_of(head, struct rcu_synchronize, head);		rcu = container_of(head, struct rcu_synchronize, head);
	complete(&rcu->completion);		complete(&rcu->completion);
	}		}

			#ifdef CONFIG_PROVE_RCU
			/*
			* wrapper function to avoid #include problems.
			*/
			int rcu_my_thread_group_empty(void)
			{
			return thread_group_empty(current);
			}
			EXPORT_SYMBOL_GPL(rcu_my_thread_group_empty);
			#endif /* #ifdef CONFIG_PROVE_RCU */