From: Jan Beulich <jbeulich@novell.com>
Date: Tue, 30 May 2006 20:47:54 +0000 (+0200)
Subject: [PATCH] x86_64: fix last_tsc calculation of PM timer
X-Git-Tag: v2.6.17-rc6~78
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2468e525f29882f866cb0b832956e69328f9647;p=pandora-kernel.git

[PATCH] x86_64: fix last_tsc calculation of PM timer

From: "Jan Beulich" <jbeulich@novell.com>

The PM timer code updates vxtime.last_tsc, but this update was done
incorrectly in two ways:
- offset_delay being in microseconds requires multiplying with cpu_mhz
  rather than cpu_khz
- the multiplication of offset_delay and cpu_khz (both being 32-bit
  values) on most current CPUs would overflow (observed value of the
  delay was approximately 4000us, yielding an overflow for frequencies
  starting a little above 1GHz)

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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