Patches needed in 3.2, 3.4, and 3.10 to fix mips problems

[Guenter Roeck]

Ben,
Greg,

please apply the following patches to the respective -stable branches.

I started seeing the problems fixed with those patches after updating
my qemu tests to also execute SMP builds. Patches apply cleanly to all
branches, and my tests pass with the patches applied.

Thanks,
Guenter
---------

3.2:
    6c37c9580409 MIPS: perf: Fix build error caused by unused 
counters_per_cpu_to_total()
    ff522058bd71 MIPS: Fix accessing to per-cpu data when flushing the cache

3.4:
    6c37c9580409 MIPS: perf: Fix build error caused by unused 
counters_per_cpu_to_total()
    ff522058bd71 MIPS: Fix accessing to per-cpu data when flushing the cache

3.10:
    ff522058bd71 MIPS: Fix accessing to per-cpu data when flushing the cache

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