linux-kernel - Re: 2.6.18-rt1

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Date:	Wed, 27 Sep 2006 10:36:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Gene Heskett <gene.heskett@...izon.net>,
	linux-kernel@...r.kernel.org, paulmck@...ibm.com,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: 2.6.18-rt1


* Daniel Walker <dwalker@...sta.com> wrote:

> On closer inspection I still think this is wrong. (Although it looks 
> really nice..) find below speaking only in term of !PREEMPT_RT ,

> > -	} else if (oops_in_progress) {
> > -		locked = spin_trylock(&up->port.lock);
> > -	} else
> > -		spin_lock(&up->port.lock);
> > +	if (up->port.sysrq || oops_in_progress)
> > +		locked = spin_trylock_irqsave(&up->port.lock, flags);
> 
> Now in the new version interrupts are only off if you _get the lock_. 
> Presumably the lock is taken in the calling function, but interrupts 
> aren't disabled.
> 
> I'm assuming the code is disabling interrupts for a good reason, I 
> don't know enough about the code to say it isn't.

yeah, agreed - behavior now changed due to my patch. This is really 
twisted code...

	Ingo
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