linux-kernel - Re: [PATCH v2 12/12] sched: Add preempt

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Message-ID: <20150930111512.GC2903@worktop.programming.kicks-ass.net>
Date:	Wed, 30 Sep 2015 13:15:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, fweisbec@...il.com, oleg@...hat.com,
	umgwanakikbuti@...il.com, tglx@...utronix.de
Subject: Re: [PATCH v2 12/12] sched: Add preempt_count invariant check

On Wed, Sep 30, 2015 at 05:38:10AM -0400, Steven Rostedt wrote:
> On Wed, 30 Sep 2015 09:10:47 +0200
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > Ingo requested I keep my debug check for the preempt_count invariant.
> > 
> > Requested-by: Ingo Molnar <mingo@...nel.org>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > ---
> >  kernel/sched/core.c |    4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -2514,6 +2514,10 @@ static struct rq *finish_task_switch(str
> >  	 *
> >  	 * Also, see FORK_PREEMPT_COUNT.
> >  	 */
> > +	if (unlikely(WARN_ONCE(preempt_count() != 2*PREEMPT_DISABLE_OFFSET,
> 
> Nuke the "unlikely" it's redundant with the WARN_ONCE().

Ah, indeed. *poof*
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