linux-kernel - [PATCH RFC] irq_work: Warn if there's still work on cpu

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Message-ID: <1353001964.18025.107.camel@gandalf.local.home>
Date:	Thu, 15 Nov 2012 12:52:44 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [PATCH RFC] irq_work: Warn if there's still work on cpu_down

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@...dmis.org>

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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