linux-kernel - Re: WARN_ON_ONCE(in_nmi()) hit in irq_work_queue

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Date:	Thu, 7 Aug 2014 15:15:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: WARN_ON_ONCE(in_nmi()) hit in irq_work_queue_on

On Thu, Aug 07, 2014 at 02:58:55PM +0200, Frederic Weisbecker wrote:
> On Thu, Aug 07, 2014 at 10:13:21AM +0200, Peter Zijlstra wrote:
> > On Thu, Aug 07, 2014 at 01:44:58AM +0200, Frederic Weisbecker wrote:
> > > In fact the problem has arised since the recent irq work patches I did.
> > 
> > No, those just added the WARN, previously we send the resched IPI, and
> > that's equally wrong from NMI context.
> 
> Well the scheduler IPI was rather used for remote kicks before we had remote irq
> work. This includes local kicks as well as the caller could need to kick
> anywhere. As in inc_nr_running().
> 
> But for strict local kicks, as in perf, we were using tick_nohz_full_kick() which has
> been using irq work for a while. But it got broken when we replaced it to call irq_work_queue_on
> instead of irq_work_queue.

OK, clearly I made a mess of things in my head ;-)

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