linux-kernel - Re: [RFC][PATCH 03/11] sched: Robustify preemption leak checks

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Message-ID: <20150929142400.GK3816@twins.programming.kicks-ass.net>
Date:	Tue, 29 Sep 2015 16:24:00 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, oleg@...hat.com,
	umgwanakikbuti@...il.com, tglx@...utronix.de, rostedt@...dmis.org
Subject: Re: [RFC][PATCH 03/11] sched: Robustify preemption leak checks

On Tue, Sep 29, 2015 at 03:25:53PM +0200, Frederic Weisbecker wrote:
> On Tue, Sep 29, 2015 at 11:28:28AM +0200, Peter Zijlstra wrote:

> > +	if (unlikely(in_atomic_preempt_off() && prev->state != TASK_DEAD)) {
> >  		__schedule_bug(prev);
> > +		preempt_count_set(PREEMPT_DISABLED);
> 
> That one would be a bit fragile if we kept PREEMPT_ACTIVE, but since we are removing
> it...

Right, let me move this patch after 7 (the one that stops setting
PREEMPT_ACTIVE).
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