aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-05-06 09:28:41 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-05-06 09:28:41 -0700
commitee84b8243b07c33a5c8aed42b4b2da60cb16d1d2 (patch)
treea5b3cad55179fe8340c6422deaf6e11120222ad1
parentad4ba375373937817404fd92239ef4cadbded23b (diff)
downloadlinux-linaro-ee84b8243b07c33a5c8aed42b4b2da60cb16d1d2.tar.gz
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>
-rw-r--r--include/linux/rcupdate.h2
-rw-r--r--kernel/rcupdate.c11
2 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 07db2feb857..db266bbed23 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -190,6 +190,8 @@ static inline int rcu_read_lock_sched_held(void)
#ifdef CONFIG_PROVE_RCU
+extern int rcu_my_thread_group_empty(void);
+
/**
* rcu_dereference_check - rcu_dereference with debug checking
* @p: The pointer to read, prior to dereferencing
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 03a7ea1579f..49d808e833b 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -122,3 +122,14 @@ void wakeme_after_rcu(struct rcu_head *head)
rcu = container_of(head, struct rcu_synchronize, head);
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 */