linux-kernel - Re: [Announce] 2.6.29-rt2

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Date:	Thu, 02 Apr 2009 11:02:25 -0500
From:	Will Schmidt <will_schmidt@...t.ibm.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Carsten Emde <ce@...g.ch>,
	Clark Williams <williams@...hat.com>,
	Frank Rowand <frank.rowand@...sony.com>,
	Robin Gareus <robin@...eus.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Philippe Reynes <philippe.reynes@...smpp.fr>,
	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
Subject: Re: [Announce] 2.6.29-rt2

On Thu, 2009-04-02 at 02:17 +0200, Thomas Gleixner wrote:
> We are pleased to announce the next update to our new preempt-rt
> series.
> 
>       - fix a fork/exit bug in the signal per task cache (/me puts on
>         a huge brown paper bag - Thanks to Phillipe Reynes and Will
>         Schmidt for reporting and testing)
> 
>       - fix a group scheduling migration accounting bug (decoded with
>         and fixed by Peter Zijlstra - reported by Robin Gareus)
> 
>       - tlb gather rework by Peter Zijlstra - Thanks Peter !
> 
>       - the usual fixlets
> 
> The tlb rework might be incomplete on some of the uncountable
> incarnations of PowerPC and ARM platforms, so look out for wreckage
> and keep the usual tools (fire-extinguishers, brooms, buckets etc.)
> handy.

I can confirm that the tlb rework does appear to be missing some parts
for Power.  (Using 2.6.29-rt3 on pseries ppc64)

arch/powerpc/kernel/built-in.o:(.toc1+0x4d0): undefined reference to
`per_cpu__ppc64_tlb_batch'
<...>
mm/built-in.o:(.toc1+0xed0): more undefined references to
`per_cpu__ppc64_tlb_batch' follow

Not clear to me if this is just missing a "DEFINE_PER_CPU_LOCKED" to
replace the removed "DEFINE_PER_CPU", (similar to the prior RT patches),
or if the tlb rework is more involved.   So, I will patiently remain
tuned in.  :-)

Thanks, 
-Will


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