UP load_up_fpu crash (2.6.8-rc2)

[Nathan Lynch]

We seem to be broken with CONFIG_SMP=n on 2.6.8-rc2 and 2.6.8-rc1-mm1:

Freeing unused kernel memory: 280k freed
INIT: version 2.85 booting
Vector: 300 (Data Access) at [c00000003f043bb0]
    pc: c00000000000bab0: .load_up_fpu+0xb0/0x16c
    lr: 00000000400272b8
    sp: c00000003f043e30
   msr: 8000000000003032
   dar: 108
 dsisr: 40000000
  current = 0xc00000003f03d440
  paca    = 0xc0000000003cc000
    pid   = 327, comm = hotplug
enter ? for help
mon> t
[c00000003f043e30] c00000000000b4d8 .handle_page_fault+0x20/0x40
(unreliable)
--- Exception: 801 (FPU Unavailable) at 000000004000b908
SP (ffffe480) is in userspace


Any ideas?  I've seen this on pSeries lpar, haven't tried anything
else.  SMP kernels are fine.  I'll try to track down the version where
this first appeared as time permits.

Nathan


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