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

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Date:	Thu, 02 Apr 2009 12:24:13 -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 18:45 +0200, Thomas Gleixner wrote:
> On Thu, 2 Apr 2009, Will Schmidt wrote:
> 
> > 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.  :-)
> 
> No, the DEFINE_PER_CPU was removed accidentaly. Should have stayed there
> 
> Thanks,
> 
> 	tglx

Thanks for the quick respin. 

Panic during boot:
<snip>
Uniform Multi-Platform E-IDE driver
ide-gd driver 1.18
ide-cd driver 5.00
mice: PS/2 mouse device common for all mice
TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 17
Freeing unused kernel memory: 292k freed
Red Hat nash version 5.1.19.6 starting
Mounting proc filesystem
Mounting sysfs filesystem
Creating /dev
Unable to handle kernel paging request for instruction fetch
Faulting instruction address: 0x00000c30
cpu 0x3: Vector: 400 (Instruction Access) at [c0000000e8203b00]
    pc: 0000000000000c30
    lr: c0000000000b7d24: .rcu_process_callbacks+0xc0/0xec
    sp: c0000000e8203d80
   msr: 8000000040009032
  current = 0xc0000000e81ff0f0
  paca    = 0xc000000000663800
    pid   = 53, comm = sirq-rcu/3
enter ? for help
[c0000000e8203d80] c0000000000b7d24 .rcu_process_callbacks+0xc0/0xec
(unreliable)
[c0000000e8203e10] c000000000070f48 .ksoftirqd+0x208/0x39c
[c0000000e8203f00] c000000000085a34 .kthread+0x78/0xc4
[c0000000e8203f90] c000000000029818 .kernel_thread+0x54/0x70
3:mon>                
3:mon> r
R00 = c0000000e8480100   R16 = c000000000467280
R01 = c0000000e8203d80   R17 = c000000000465980
R02 = 000000000014ff97   R18 = 0000000000000000
R03 = c0000000e6b6b880   R19 = c0000000e8200000
R04 = 0000000000000001   R20 = c00000000065be58
R05 = c000000000663800   R21 = 0000000000000000
R06 = c0000000e8203cc8   R22 = 0000000000000003
R07 = 0000000000200200   R23 = 0000000000000003
R08 = 0000000000000001   R24 = c000000000663800
R09 = c0000000e6b60eb0   R25 = c000000000696f00
R10 = c000000000538280   R26 = c00000000079e620
R11 = 0000000000000001   R27 = 0000000000000100
R12 = 0000000084000082   R28 = 0000000000000001
R13 = c000000000663800   R29 = c00000000079ea28
R14 = 0000000000000000   R30 = c0000000005d1538
R15 = 0000000002100000   R31 = c0000000e8480100
pc  = 0000000000000c30
lr  = c0000000000b7d24 .rcu_process_callbacks+0xc0/0xec
msr = 8000000040009032   cr  = 24000088
ctr = 0000000000000c31   xer = 0000000020000004   trap =  400




> 
> --------
> 
> Index: linux-2.6-tip/arch/powerpc/mm/tlb_hash64.c
> ===================================================================
> --- linux-2.6-tip.orig/arch/powerpc/mm/tlb_hash64.c
> +++ linux-2.6-tip/arch/powerpc/mm/tlb_hash64.c
> @@ -32,6 +32,8 @@
>  #include <asm/bug.h>
>  #include <asm/machdep.h>
> 
> +DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
> +
>  /*
>   * A linux PTE was changed and the corresponding hash table entry
>   * neesd to be flushed. This function will either perform the flush

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