From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Wed, 13 May 2009 07:45:19 +0000 (+0200)
Subject: perf_counter: x86: More accurate counter update
X-Git-Tag: v2.6.31-rc1~383^2~281
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ec3232bdf8518bea8410f0027f870b24d3aa8753;p=pandora-kernel.git

perf_counter: x86: More accurate counter update

Take the counter width into account instead of assuming 32 bits.

In particular Nehalem has 44 bit wide counters, and all
arithmetics should happen on a 44-bit signed integer basis.

[ Impact: fix rare event imprecision, warning message on Nehalem ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

Reading git-diff-tree failed