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From: Davide Italiano <davide@FreeBSD.org>
Date: Thu, 28 Feb 2013 11:27:02 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r247460 - head/sys/dev/acpica
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Author: davide
Date: Thu Feb 28 11:27:01 2013
New Revision: 247460
URL: http://svnweb.freebsd.org/changeset/base/247460

Log:
  MFcalloutng (r247427 by mav):
  We don't need any precision here. Let it be fast and dirty shift then
  slow and excessively precise 64-bit division.

Modified:
  head/sys/dev/acpica/acpi_cpu.c

Modified: head/sys/dev/acpica/acpi_cpu.c
==============================================================================
--- head/sys/dev/acpica/acpi_cpu.c	Thu Feb 28 10:59:40 2013	(r247459)
+++ head/sys/dev/acpica/acpi_cpu.c	Thu Feb 28 11:27:01 2013	(r247460)
@@ -981,8 +981,8 @@ acpi_cpu_idle(sbintime_t sbt)
 
     /* Find the lowest state that has small enough latency. */
     us = sc->cpu_prev_sleep;
-    if (sbt >= 0 && us > sbt / SBT_1US)
-	us = sbt / SBT_1US;
+    if (sbt >= 0 && us > (sbt >> 12))
+	us = (sbt >> 12);
     cx_next_idx = 0;
     if (cpu_disable_deep_sleep)
 	i = min(sc->cpu_cx_lowest, sc->cpu_non_c3);