[PATCH RFC] irq_work: Warn if there's still work on cpu_down

[Steven Rostedt]

If we are in nohz and there's still irq_work to be done when the idle
task is about to go offline. Give a nasty warning.

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>

Index: linux-rt.git/kernel/irq_work.c
===================================================================
--- linux-rt.git.orig/kernel/irq_work.c
+++ linux-rt.git/kernel/irq_work.c
@@ -103,6 +103,9 @@ bool irq_work_needs_cpu(void)
 	if (llist_empty(this_list))
 		return false;
 
+	/* All work should have been flushed before going offline */
+	WARN_ON_ONCE(cpu_is_offline(smp_processor_id()));
+
 	return true;
 }
 


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