workqueue: implement current_is_async()
This function queries whether %current is an async worker executing an
async item. This will be used to implement warning on synchronous
request_module() from async workers.
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
index 02549fa0..cc35e7e 100644
--- a/kernel/workqueue_internal.h
+++ b/kernel/workqueue_internal.h
@@ -8,6 +8,7 @@
#define _KERNEL_WORKQUEUE_INTERNAL_H
#include <linux/workqueue.h>
+#include <linux/kthread.h>
struct global_cwq;
struct worker_pool;
@@ -44,6 +45,16 @@
struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */
};
+/**
+ * current_wq_worker - return struct worker if %current is a workqueue worker
+ */
+static inline struct worker *current_wq_worker(void)
+{
+ if (current->flags & PF_WQ_WORKER)
+ return kthread_data(current);
+ return NULL;
+}
+
/*
* Scheduler hooks for concurrency managed workqueue. Only to be used from
* sched.c and workqueue.c.