[PATCH] kthread: export park/unpark facility

[Jean Tourrilhes <jt@hpl.hp.com>]

	Hi,

	The kthread park/unpark facility is not used in the kernel, so
one would assume that it's made for kernel modules. This patch should
definitely help most modules.
	Patch untested, at your own risks...
	Regards,

	Jean

Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com>

diff -u -p linux-3.18.17/kernel/kthread.j2.c linux-3.18.17/kernel/kthread.c
--- linux-3.18.17/kernel/kthread.j2.c	2015-07-08 17:01:39.010554169 -0700
+++ linux-3.18.17/kernel/kthread.c	2015-07-08 17:09:13.016096189 -0700
@@ -97,6 +97,7 @@ bool kthread_should_park(void)
 {
 	return test_bit(KTHREAD_SHOULD_PARK, &to_kthread(current)->flags);
 }
+EXPORT_SYMBOL(kthread_should_park);
 
 /**
  * kthread_freezable_should_stop - should this freezable kthread return now?
@@ -171,6 +172,7 @@ void kthread_parkme(void)
 {
 	__kthread_parkme(to_kthread(current));
 }
+EXPORT_SYMBOL(kthread_parkme);
 
 static int kthread(void *_create)
 {
@@ -411,6 +413,7 @@ void kthread_unpark(struct task_struct *
 	if (kthread)
 		__kthread_unpark(k, kthread);
 }
+EXPORT_SYMBOL(kthread_unpark);
 
 /**
  * kthread_park - park a thread created by kthread_create().
@@ -441,6 +444,7 @@ int kthread_park(struct task_struct *k)
 	}
 	return ret;
 }
+EXPORT_SYMBOL(kthread_park);
 
 /**
  * kthread_stop - stop a thread created by kthread_create().