linux-kernel - Re: rt-preempt: problem compiling rt-preempt 2.6.23.1-rt11 on MIPS

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Date:	Wed, 14 Nov 2007 21:24:20 -0500
From:	john cooper <john.cooper@...rd-harmonic.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Tim Bird <tim.bird@...sony.com>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	john cooper <john.cooper@...rd-harmonic.com>
Subject: Re: rt-preempt: problem compiling rt-preempt 2.6.23.1-rt11 on MIPS

Thomas Gleixner wrote:

> I fear you are the one who is in charge to get mips working again :)
> But as always, there are bad news and good news:  As far as I heard
> last week John Cooper is looking into this as well.

I'm not actively working on it but AFAIK I may have been
the last one to touch it when I did the mips version back
at Timesys.  Although I was able to get a functional port
of the work there were gremlins I never had sufficient
time to address.  That is a relatively minor issue.

The more daunting problem stems from limitations in the MIPS
ABI which makes the latency trace support problematic.
Rather than rehash the issue:

     http://lists.linuxcoding.com/kernel/2005-q4/msg10163.html

Until we have a usable instrumentation solution in place,
characterization, debug, and support of PREEMPT_RT for MIPS
is going to be a challenge.

-john

-- 
john.cooper@...rd-harmonic.com
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