linux-kernel - Re: [RFC][PATCH 02/11] sched: Create preempt

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Message-ID: <20150929104044.60172e41@gandalf.local.home>
Date:	Tue, 29 Sep 2015 10:40:44 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>, mingo@...nel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	oleg@...hat.com, umgwanakikbuti@...il.com, tglx@...utronix.de
Subject: Re: [RFC][PATCH 02/11] sched: Create preempt_count invariant

On Tue, 29 Sep 2015 15:02:01 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, Sep 29, 2015 at 02:55:13PM +0200, Frederic Weisbecker wrote:
> > On Tue, Sep 29, 2015 at 11:28:27AM +0200, Peter Zijlstra wrote:
> > >  #define init_task_preempt_count(p) do { \
> > > -	task_thread_info(p)->preempt_count = PREEMPT_DISABLED; \
> > > +	task_thread_info(p)->preempt_count = 2*PREEMPT_DISABLED; \
> > 
> > Since it's not quite obvious why we use this magic value without looking
> > at schedule_tail() details, maybe add a little comment? (Just "/* see schedule_tail() */").
> 
> Right, I fixed that in 12/11 v2. I'll change that around a bit.

I'll wait for v2 because this confused me too.

-- Steve
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