[PATCH V4] POWER: perf_event: Skip updating kernel counters if register value shrinks

[Eric B Munson]

On Wed, 27 Apr 2011, David Laight wrote:

> > But it isn't, and it doesn't have trouble with 2^32 - 1.  
> 
> what about:
> prev = 0x00000001
> val  = 0xffffffff

Result is 0xfffffffe and we are fine.
> 
> 	David
> 
> 
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