3.2-rc2 freezes on boot for AMD K6 - bisected to commit bcb80e53877c2045d9e52f4a71372c3fe6501f6f

[Larry Finger]

I have an ancient laptop with an AMD-K6 CPU that freezes on boot with 3.2-rc2. 
The problem was bisected to commit bcb80e53877c2.

The cpuinfo for this box is:

>> cpu.1: cpuinfo
----- /proc/cpuinfo -----
  processor     : 0
  vendor_id     : AuthenticAMD
  cpu family    : 5
  model         : 8
  model name    : AMD-K6(tm) 3D processor
  stepping      : 12
  cpu MHz               : 428.804
  cache size    : 64 KB
  fdiv_bug      : no
  hlt_bug               : no
  f00f_bug      : no
  coma_bug      : no
  fpu           : yes
  fpu_exception : yes
  cpuid level   : 1
  wp            : yes
  flags         : fpu vme de pse tsc msr cx8 pge mmx syscall 3dnow k6_mtrr up
  bogomips      : 857.60
  clflush size  : 32
  cache_alignment       : 32
  address sizes : 32 bits physical, 32 bits virtual
  power management:

----- /proc/cpuinfo end -----

This patch is quite simple, thus it appears that rdmsr() is OK, but that 
rdmsr_safe() is not.

I am happy to provide any other info regarding this box.

Larry

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