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authorIngo Molnar <mingo@elte.hu>2008-05-12 21:20:52 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-05-23 21:05:02 +0200
commit017730c11241e26577673eb9d957cfc66172ea91 (patch)
tree3585323be944d23814b3e28b50042b7477cc9206 /kernel/sched.c
parent24cd5d111e8c713e62cda7ca1d01232402e3d3c9 (diff)
downloadop-kernel-dev-017730c11241e26577673eb9d957cfc66172ea91.zip
op-kernel-dev-017730c11241e26577673eb9d957cfc66172ea91.tar.gz
ftrace: fix wakeups
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 673b588..9ca4a2e 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -642,6 +642,24 @@ static inline void update_rq_clock(struct rq *rq)
# define const_debug static const
#endif
+/**
+ * runqueue_is_locked
+ *
+ * Returns true if the current cpu runqueue is locked.
+ * This interface allows printk to be called with the runqueue lock
+ * held and know whether or not it is OK to wake up the klogd.
+ */
+int runqueue_is_locked(void)
+{
+ int cpu = get_cpu();
+ struct rq *rq = cpu_rq(cpu);
+ int ret;
+
+ ret = spin_is_locked(&rq->lock);
+ put_cpu();
+ return ret;
+}
+
/*
* Debugging: various feature bits
*/
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