---

yaml
---
r: 22540
b: refs/heads/master
c: 1fa44ec
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ba3af0aff042caa1f41b5f7164cab37c717b8811
+refs/heads/master: 1fa44ecad2b86475e038aed81b0bf333fa484f8b

trunk/include/linux/workqueue.h

@@ -20,6 +20,10 @@ struct work_struct {
 	struct timer_list timer;
 };
 
+struct execute_work {
+	struct work_struct work;
+};
+
 #define __WORK_INITIALIZER(n, f, d) {				\
         .entry	= { &(n).entry, &(n).entry },			\
 	.func = (f),						\
@@ -74,6 +78,8 @@ extern void init_workqueues(void);
 void cancel_rearming_delayed_work(struct work_struct *work);
 void cancel_rearming_delayed_workqueue(struct workqueue_struct *,
 				       struct work_struct *);
+int execute_in_process_context(void (*fn)(void *), void *,
+			       struct execute_work *);
 
 /*
  * Kill off a pending schedule_delayed_work().  Note that the work callback

trunk/kernel/workqueue.c

@@ -27,6 +27,7 @@
 #include <linux/cpu.h>
 #include <linux/notifier.h>
 #include <linux/kthread.h>
+#include <linux/hardirq.h>
 
 /*
  * The per-CPU workqueue (if single thread, we always use the first
@@ -476,6 +477,34 @@ void cancel_rearming_delayed_work(struct work_struct *work)
 }
 EXPORT_SYMBOL(cancel_rearming_delayed_work);
 
+/**
+ * execute_in_process_context - reliably execute the routine with user context
+ * @fn:		the function to execute
+ * @data:	data to pass to the function
+ * @ew:		guaranteed storage for the execute work structure (must
+ *		be available when the work executes)
+ *
+ * Executes the function immediately if process context is available,
+ * otherwise schedules the function for delayed execution.
+ *
+ * Returns:	0 - function was executed
+ *		1 - function was scheduled for execution
+ */
+int execute_in_process_context(void (*fn)(void *data), void *data,
+			       struct execute_work *ew)
+{
+	if (!in_interrupt()) {
+		fn(data);
+		return 0;
+	}
+
+	INIT_WORK(&ew->work, fn, data);
+	schedule_work(&ew->work);
+
+	return 1;
+}
+EXPORT_SYMBOL_GPL(execute_in_process_context);
+
 int keventd_up(void)
 {
 	return keventd_wq != NULL;