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.

Paul E. McKenney committed 16 years ago

Commit ee84b821 parent ad4ba372 files · +13 −0Browse files

Unified · Split

2 files

include/linux/rcupdate.h +2 −0
kernel/rcupdate.c +11 −0

include/linux/rcupdate.h+2−0

@@ -190,6 +190,8 @@ static inline int rcu_read_lock_sched_held(void) · 189 unmodified lines
190		190
191	#ifdef CONFIG_PROVE_RCU	191	#ifdef CONFIG_PROVE_RCU
192		192
		193	extern int rcu_my_thread_group_empty(void);
		194
193	/**	195	/**
194	* rcu_dereference_check - rcu_dereference with debug checking	196	* rcu_dereference_check - rcu_dereference with debug checking
195	* @p: The pointer to read, prior to dereferencing	197	* @p: The pointer to read, prior to dereferencing

kernel/rcupdate.c+11−0

@@ -122,3 +122,14 @@ void wakeme_after_rcu(struct rcu_head *head) · 121 unmodified lines
122	rcu = container_of(head, struct rcu_synchronize, head);	122	rcu = container_of(head, struct rcu_synchronize, head);
123	complete(&rcu->completion);	123	complete(&rcu->completion);
124	}	124	}
		125
		126	#ifdef CONFIG_PROVE_RCU
		127	/*
		128	* wrapper function to avoid #include problems.
		129	*/
		130	int rcu_my_thread_group_empty(void)
		131	{
		132	return thread_group_empty(current);
		133	}
		134	EXPORT_SYMBOL_GPL(rcu_my_thread_group_empty);
		135	#endif /* #ifdef CONFIG_PROVE_RCU */