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

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Date:	Wed, 27 Apr 2011 13:34:58 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Eric B Munson" <emunson@...bm.net>
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

> But it isn't, and it doesn't have trouble with 2^32 - 1.  

what about:
prev = 0x00000001
val  = 0xffffffff

	David


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