Kernel broken on processors without performance counters

[Mikulas Patocka]

Hi

I found out that the patch a66734297f78707ce39d756b656bfae861d53f62 breaks 
the kernel on processors without performance counters, such as AMD K6-3. 
Reverting the patch fixes the problem.

The static key rdpmc_always_available somehow gets set (I couldn't really 
find out what is setting it, the function set_attr_rdpmc is not executed), 
cr4_set_bits(X86_CR4_PCE) is executed and that results in a crash on boot 
when attempting to execute init, because the proecssor doesn't support 
that bit in CR4.

Mikulas
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