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

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Message-ID: <20110427125930.GB2936@mgebm.net>
Date:	Wed, 27 Apr 2011 08:59:31 -0400
From:	Eric B Munson <emunson@...bm.net>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	benh@...nel.crashing.org, a.p.zijlstra@...llo.nl, paulus@...ba.org,
	mingo@...e.hu, acme@...stprotocols.net,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	anton@...ba.org, stable@...nel.org
Subject: Re: [PATCH V4] POWER: perf_event: Skip updating kernel counters if
 register value shrinks

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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