Commit ee84b824 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatar"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 */

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