linux-kernel - Re: irq_work: WARNING: at kernel/irq_work.c:98 irq_work_needs

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Date:	Sun, 10 Mar 2013 14:48:08 -0400
From:	Sasha Levin <levinsasha928@...il.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	Sasha Levin <sasha.levin@...cle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	paul.gortmaker@...driver.com, Dave Jones <davej@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: irq_work: WARNING: at kernel/irq_work.c:98 irq_work_needs_cpu+0x8a/0xb0()

On 03/08/2013 05:20 PM, Paul E. McKenney wrote:
> Alternatively, given that this is a debug option, how about replacing
> the schedule_timeout_uninterruptible() with something like the following:
> 
> 	{
> 		unsigned long starttime = jiffies + 2;
> 
> 		while (ULONG_CMP_LT(jiffies, starttime))
> 			cpu_relax();
> 	}
> 
> That way the RCU GP kthread would never go to sleep, and thus would not
> have to wait for the timer to wake it up.  If this works, then my next
> thought would be to try to get at the timer state for the wakeup fo
> schedule_timeout_uninterruptible().

It did the trick, I still see those IRQ warnings but the RCU lockup
is gone.


Thanks,
Sasha
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