Kernel Preemption patch

[brian.auld at adic.com]

Hello,

Has anyone successfully applied and run the linux kernel preemption patch on
a 2.4.20 kernel. I have the following:

- Latest Denx kernel (2_4_devel) running on 440GP ebony
- 'preempt-kernel-rml-2.4.20-1.patch' applied to my kernel source
  (I manually corrected a couple of fails and double checked a few
   'successfully applied with fuzz' instances when applying the patch).
- Kernel compiled with 'Kernel preemption =y' in make oldconfig

When I try to boot this kernel, I get the following error:

<------- snipped
Kernel command line: root=/dev/nfs rw
nfsroot=172.16.77.152:/opt/eldk/ppc_4xx
ip=172.16.77.155:172.16.77.152::255.255.255.0:EBONY-2::off
kernel BUG at irq.c:575!
Oops: Exception in kernel mode, sig: 4
NIP: C0002B04 XER: 00000000 LR: C0002B04 SP: C0125F50 REGS: c0125ea0 TRAP:
0700    Not tainted
MSR: 00001030 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 11
TASK = c0124060[0] 'swapper' Last syscall: 0
last math 00000000 last altivec 00000000
PLB0: bear= 0x00008000 acr=   0x9b000000 besr=  0x00000000

GPR00: C0002B04 C0125F50 C0124060 00000019 00001030 00000001 00000020
C0170000
GPR08: 000001D8 00000002 00000000 C0125E70 C012A8A8 71000000 07FE7300
007FFC73
GPR16: 00000000 00000001 007FFC00 FFFFFFFF 00001032 C0125F60 00000000
C00017CC
GPR24: C0002AA0 007FFB90 00000E00 007FFC73 007FFC00 00000000 00000000
007FFB90
Call backtrace:
C0002B04 C00017CC C0133504 C0000224
Kernel panic: Attempted to kill the idle task!
In idle task - not syncing
 <0>Rebooting in 180 seconds..
---------> the end

-- Brian

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