linux-kernel - Re: [PATCH, RFC] improved hacks to allow -rt to run kernbench on POWER

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Date:	Sun, 11 Nov 2007 09:45:46 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	tony@...eyournoodle.com, paulus@...ba.org, dino@...ibm.com,
	tytso@...ibm.com, dvhltc@...ibm.com, niv@...ibm.com,
	antonb@...ibm.com
Subject: Re: [PATCH, RFC] improved hacks to allow -rt to run kernbench on
 POWER


On Sun, 11 Nov 2007, Benjamin Herrenschmidt wrote:

>
> > Removed this as well, also seemed to work.  Please note, however, that
> > this is just running kernbench.  But this did seem to get rid of some
> > of the warnings as well.  ;-)  Now only have the xics_startup() warning.
> >
> > > Overall, looks fine !
> >
> > I bet that there are more gotchas lurking in there somewhere, but in
> > the meantime here is the updated patch.
> >
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > ---
>
> Well, I suppose the patch could go in, maybe with some ifdef's around
> the bits in _switch_to, there's little point in doing that on non-rt
> kernels.

As Nick Piggin already stated, and I'll even state it for the RT kernel,
we do not allow preemption in switch_to. So it is safe to remove those
"preempt_disable" bits from the patch.

-- Steve
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