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rcu: create rcu_my_thread_group_empty() wrapper

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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>
This commit is contained in:
Paul E. McKenney 2010-05-06 09:28:41 -07:00
parent ad4ba37537
commit ee84b8243b
2 changed files with 13 additions and 0 deletions
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2
include/linux/rcupdate.h
View file

@ -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

11
kernel/rcupdate.c
View file

@ -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 */