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authorTejun Heo <tj@kernel.org>2010-06-29 10:07:09 +0200
committerTejun Heo <tj@kernel.org>2010-06-29 10:07:09 +0200
commit82805ab77d25643f579d90397dcd34f05d1b750a (patch)
tree4e5fd250d8625e032250fd02101c3b6ce595cbbf
parent7bc465605ffa90b281d6b774fcb13911636a6d45 (diff)
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>
-rw-r--r--include/linux/kthread.h1
-rw-r--r--kernel/kthread.c15
2 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index f93cb6979edc..685ea65eb803 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -30,6 +30,7 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
void kthread_bind(struct task_struct *k, unsigned int cpu);
int kthread_stop(struct task_struct *k);
int kthread_should_stop(void);
+void *kthread_data(struct task_struct *k);
int kthreadd(void *unused);
extern struct task_struct *kthreadd_task;
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 8b63c7fee73b..2dc3786349d1 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -37,6 +37,7 @@ struct kthread_create_info
struct kthread {
int should_stop;
+ void *data;
struct completion exited;
};
@@ -56,6 +57,19 @@ int kthread_should_stop(void)
}
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 @@ static int kthread(void *_create)
int ret;
self.should_stop = 0;
+ self.data = data;
init_completion(&self.exited);
current->vfork_done = &self.exited;