Re: irq_work: WARNING: at kernel/irq_work.c:98 irq_work_needs_cpu+0x8a/0xb0()

[Sasha Levin <levinsasha928@gmail.com>]

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