linux-kernel - [PATCH] kthread: Export kthread functions

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Message-ID: <1437777920-31156-1-git-send-email-david.kershner@unisys.com>
Date:	Fri, 24 Jul 2015 18:45:20 -0400
From:	David Kershner <david.kershner@...sys.com>
To:	<akpm@...ux-foundation.org>
CC:	<tj@...nel.org>, <laijs@...fujitsu.com>, <nacc@...ux.vnet.ibm.com>,
	<nhorman@...hat.com>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<linux-kernel@...r.kernel.org>, <jes.sorensen@...hat.com>,
	<sparmaintainer@...sys.com>,
	David Kershner <david.kershner@...sys.com>
Subject: [PATCH] kthread: Export kthread functions

The s-Par visornic driver, currently in staging, processes a queue
being serviced by the an s-Par service partition. We can get a message
that something has happened with the Service Partition, when that
happens, we must not access the channel until we get a message that the
service partition is back again.

The visornic driver has a thread for processing the channel, when we
get the message, we need to be able to park the thread and then resume
it when the problem clears.

We can do this with kthread_park and unpark but they are not exported
from the kernel, this patch exports the needed functions.

Signed-off-by: David Kershner <david.kershner@...sys.com>
---
 kernel/kthread.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 10e489c..bad80c1 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -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 *k)
 	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().
-- 
1.9.1

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