linux-kernel - [PATCH] kthread: Export kthread

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Message-Id: <1518187941-29275-1-git-send-email-longman@redhat.com>
Date:   Fri,  9 Feb 2018 09:52:21 -0500
From:   Waiman Long <longman@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Waiman Long <longman@...hat.com>
Subject: [PATCH] kthread: Export kthread_data()

When multiple kernel threads are created to cooperatively work on
a common task, we may need a convenient way to access data that are
specific to each kthread.

The kthread_data() function fits this need.  However, it was not
visible to kthreads started in a kernel module. To solve this problem,
the kthread_data() function is now exported allowing kthreads from
kernel modules to use it.

Signed-off-by: Waiman Long <longman@...hat.com>
---
 kernel/kthread.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/kthread.c b/kernel/kthread.c
index cd50e99..a71d461 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -156,6 +156,7 @@ void *kthread_data(struct task_struct *task)
 {
 	return to_kthread(task)->data;
 }
+EXPORT_SYMBOL(kthread_data);

 /**
  * kthread_probe_data - speculative version of kthread_data()
-- 
1.8.3.1