From: Krzysztof Helt (krzysztof.h1@wp.pl)

It adds a fallback for CPU cache size detection. According to Sun
documentation, it is possible to have SMP system with SM40 modules.
It counts only data cache after David Miller suggestion.

Signed-off-by: Krzysztof Helt (krzysztof.h1@wp.pl) 
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I don't think that counting only data cache is right but it does
not matter as scheduler do not use values lesser than 64KB (it
uses 64KB instead).

Regards,
Krzysztof

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