kthread: implement kthread_data()
Implement kthread_data() which takes @task pointing to a kthread and
returns @data specified when creating the kthread. The caller is
responsible for ensuring the validity of @task when calling this
function.
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 8b63c7f..2dc3786 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -37,6 +37,7 @@
struct kthread {
int should_stop;
+ void *data;
struct completion exited;
};
@@ -56,6 +57,19 @@
}
EXPORT_SYMBOL(kthread_should_stop);
+/**
+ * kthread_data - return data value specified on kthread creation
+ * @task: kthread task in question
+ *
+ * Return the data value specified when kthread @task was created.
+ * The caller is responsible for ensuring the validity of @task when
+ * calling this function.
+ */
+void *kthread_data(struct task_struct *task)
+{
+ return to_kthread(task)->data;
+}
+
static int kthread(void *_create)
{
/* Copy data: it's on kthread's stack */
@@ -66,6 +80,7 @@
int ret;
self.should_stop = 0;
+ self.data = data;
init_completion(&self.exited);
current->vfork_done = &self.exited;