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I noticed the following change.  The perf_event_open() syscall has various 
64-bit fields (that are 64-bit even on 32-bit machines) that I set with 
rand64().  Do I need to change something to get that to work?

Vince

commit c5bcbb108fe920851b853180849153ebcacb300a
Author: Dave Jones <davej@xxxxxxxxxx>
Date:   Fri Jul 12 16:09:54 2013 -0400

    limit rand64 to 32bits when building on 32bit.
    
    I might later change this to make this function return u64 if necessary,
    but for now, the rand64() consumers on 32bit don't care because
    they work on ulongs.


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