57fb188 Bring in build fixes for perf on non-x86 machines

Authored and Committed by jwboyer 8 years ago
    Bring in build fixes for perf on non-x86 machines
    
    This is literally Ingo's perf-urgent-for-linus branch right now.  I guess we
    need it more urgently than he wants to push it to Linus
    
        
file modified
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