linux-kernel - Re: [PATCH 1/2] hrtimers: extend hrtimer base code to handle more then 2 clockids

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Date:	Tue, 1 Feb 2011 19:47:36 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	John Stultz <john.stultz@...aro.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Jamie Lokier <jamie@...reable.org>,
	Alexander Shishkin <virtuoso@...nd.org>,
	Arve Hjønnevåg <arve@...roid.com>
Subject: Re: [PATCH 1/2] hrtimers: extend hrtimer base code to handle more
 then 2 clockids

On Tue, 1 Feb 2011, John Stultz wrote:
> On Tue, 2011-02-01 at 15:10 +0100, Thomas Gleixner wrote:
> > On Mon, 31 Jan 2011, John Stultz wrote:
> > > +static inline int hrtimer_clockid_to_base(clockid_t clock_id)
> > > +{
> > > +	int ret = hrtimer_clock_to_base_table[clock_id];
> > > +
> > > +	if(ret == -1) {
> > > +		WARN_ON(1);
> > > +		/* We just hit an invalid clock base,
> > > +		 * but returning -1 isn't safe, so
> > > +		 * return the _REALTIME base
> > > +		 */
> > 
> >   How can this happen ?
> 
> It can't right now. I'm just worried someone will try to put a clockid
> that doesn't have an hrtimer base into that function sometime in the
> future. We can wrap it in a debug config maybe?

Hmm. That would have exploded the current code as well. So I won't
worry too much about.

Thanks,

	tglx
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