diff --git a/kernel/kthread.c b/kernel/kthread.c
index 24be714..4f9c60e 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -216,23 +216,6 @@
  */
 int kthread_stop(struct task_struct *k)
 {
-	return kthread_stop_sem(k, NULL);
-}
-EXPORT_SYMBOL(kthread_stop);
-
-/**
- * kthread_stop_sem - stop a thread created by kthread_create().
- * @k: thread created by kthread_create().
- * @s: semaphore that @k waits on while idle.
- *
- * Does essentially the same thing as kthread_stop() above, but wakes
- * @k by calling up(@s).
- *
- * Returns the result of threadfn(), or %-EINTR if wake_up_process()
- * was never called.
- */
-int kthread_stop_sem(struct task_struct *k, struct semaphore *s)
-{
 	int ret;
 
 	mutex_lock(&kthread_stop_lock);
@@ -246,10 +229,7 @@
 
 	/* Now set kthread_should_stop() to true, and wake it up. */
 	kthread_stop_info.k = k;
-	if (s)
-		up(s);
-	else
-		wake_up_process(k);
+	wake_up_process(k);
 	put_task_struct(k);
 
 	/* Once it dies, reset stop ptr, gather result and we're done. */
@@ -260,7 +240,7 @@
 
 	return ret;
 }
-EXPORT_SYMBOL(kthread_stop_sem);
+EXPORT_SYMBOL(kthread_stop);
 
 static __init int helper_init(void)
 {