powerpc boot regression

[Tony Breeds]

On Tue, Apr 29, 2008 at 11:12:41PM -0700, David Miller wrote:
> 
> This commit causes bootup failures on sparc64:
> 
> commit 86f6dae1377523689bd8468fed2f2dd180fc0560
> Author: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>
> Date:   Mon Apr 28 02:13:33 2008 -0700
> 
>     memory hotplug: allocate usemap on the section with pgdat


<snip>

We're seeing a boot failure on powerpc.  git bisect points the problem
at this commit.   However reverting just this one comitt doesn't fix the
regression.  I also needed to revert
04753278769f3b6c3b79a080edb52f21d83bf6e2 (memory hotplug: register
section/node id to free")

Problem seen on power4, power5 and ps3.

If the fix isn't trivial, can we get that patch series reverted?

FWIW a boot looks like:
zImage starting: loaded at 0x00400000 (sp: 0x02f5fea0)
Allocating 0xa2d4c8 bytes for kernel ...
OF version = 'IBM,SF240_332'
gunzipping (0x01400000 <- 0x00407000:0x0079aa5d)...done 0x9a8ee0 bytes

Linux/PowerPC load: root=/dev/sdc3 ro
Finalizing device tree... using OF tree (promptr=02039a68)
OF stdout device is: /vdevice/vty@30000000
Hypertas detected, assuming LPAR !
command line: root=/dev/sdc3 ro
memory layout at init:
  alloc_bottom : 0000000001e32000
  alloc_top    : 0000000008000000
  alloc_top_hi : 0000000080000000
  rmo_top      : 0000000008000000
  ram_top      : 0000000080000000
Looking for displays
instantiating rtas at 0x00000000076a1000 ... done
0000000000000000 : boot cpu     0000000000000000
copying OF device tree ...
Building dt strings...
Building dt structure...
Device tree strings 0x0000000001e33000 -> 0x0000000001e3417c
Device tree struct  0x0000000001e35000 -> 0x0000000001e3d000
Calling quiesce ...
returning from prom_init
Crash kernel location must be 0x2000000
Reserving 0MB of memory at 32MB for crashkernel (System RAM: 2048MB)
Using pSeries machine description
console [udbg0] enabled
Partition configured for 20 cpus.
CPU maps initialized for 2 threads per core
Starting Linux PPC64 #52 SMP Thu May 1 14:04:46 EST 2008
-----------------------------------------------------
ppc64_pft_size                = 0x19
physicalMemorySize            = 0x80000000
htab_hash_mask                = 0x3ffff
-----------------------------------------------------
Initializing cgroup subsys cpuset
Linux version 2.6.25 (tony@Sprygo) (gcc version 4.0.4 20060507 (prerelease) (Debian 4.0.3-3)) #52 SMP Thu May 1 14:04:46 EST 2008
[boot]0012 Setup Arch
sparse_early_usemap_alloc: allocation failed
<snip 127 more>
EEH: No capable adapters found
PPC64 nvram contains 7168 bytes
Zone PFN ranges:
  DMA             0 ->   524288
  Normal     524288 ->   524288
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
    0:        0 ->   524288
[boot]0015 Setup Done
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 517120
Kernel command line: root=/dev/sdc3 ro
[boot]0020 XICS Init
[boot]0021 XICS Done
PID hash table entries: 4096 (order: 12, 32768 bytes)
clocksource: timebase mult[1545815] shift[22] registered
Console: colour dummy device 80x25
console handover: boot [udbg0] -> real [hvc0]
Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
Unable to handle kernel paging request for data at address 0xcf00000000030858
Faulting instruction address: 0xc0000000000c4530
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=32 pSeries
Modules linked in:
NIP: c0000000000c4530 LR: c0000000007e8790 CTR: 80000000001af404
REGS: c000000000987ae0 TRAP: 0300   Not tainted  (2.6.25)
MSR: 8000000000009032 <EE,ME,IR,DR>  CR: 24000088  XER: 20000002
DAR: cf00000000030858, DSISR: 0000000040010000
TASK = c000000000862650[0] 'swapper' THREAD: c000000000984000 CPU: 0
GPR00: 0000000020000000 c000000000987d60 c000000000981f18 cf00000000030858 
GPR04: 0000000000000000 0000000000000001 0000000000000000 c0000000009f2a68 
GPR08: c0000000009f2a58 00000000000001b8 0000000000000000 cf00000000030858 
GPR12: 0000000000004000 c0000000009ae400 0000000000000000 0000000000000000 
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000001 
GPR20: c00000007ffe8000 0000000000080000 0000000000000001 c0000000009f2848 
GPR24: cf00000000030200 0000000040000000 0000000000000dc0 000000000000001d 
GPR28: ffffffffe0000000 cf00000000030890 c0000000008e5088 0000000000000dde 
NIP [c0000000000c4530] .__free_pages_bootmem+0xc/0xa8
LR [c0000000007e8790] .free_all_bootmem_core+0x140/0x218
Call Trace:
[c000000000987d60] [0000000001c0a438] 0x1c0a438 (unreliable)
[c000000000987e40] [c0000000007d29c8] .mem_init+0x68/0x1b0
[c000000000987ed0] [c0000000007c091c] .start_kernel+0x34c/0x45c
[c000000000987f90] [c00000000000859c] .start_here_common+0x4c/0xb0
Instruction dump:
780007c6 792907c6 7c630214 38000038 7863a302 7c6301d2 4d820020 7c634a14 
4bffffa0 7c862379 7c6b1b78 40820028 <e8030000> 39200000 7800a842 78005800 
---[ end trace 8640abe69a316dee ]---
Kernel panic - not syncing: Attempted to kill the idle task!
Rebooting in 180 seconds..

Yours Tony

  linux.conf.au    http://www.marchsouth.org/
  Jan 19 - 24 2009 The Australian Linux Technical Conference!

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