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Date:      Wed, 29 Oct 2008 21:08:34 +0000 (UTC)
From:      Maxim Sobolev <sobomax@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org
Subject:   svn commit: r184454 - in stable/7/sys: . amd64/amd64 i386/i386
Message-ID:  <200810292108.m9TL8YNR033085@svn.freebsd.org>
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Author: sobomax
Date: Wed Oct 29 21:08:34 2008
New Revision: 184454
URL: http://svn.freebsd.org/changeset/base/184454

Log:
  MFC: don't panic when HZ value is below 32. This change may need a bit
  of refinement later, as bde says that 4BSD expects stathz of 128, while
  in this case stathz would be in the range 40-128.
  
  Approved by:	re (kib, kensmith)

Modified:
  stable/7/sys/   (props changed)
  stable/7/sys/amd64/amd64/local_apic.c
  stable/7/sys/i386/i386/local_apic.c

Modified: stable/7/sys/amd64/amd64/local_apic.c
==============================================================================
--- stable/7/sys/amd64/amd64/local_apic.c	Wed Oct 29 20:19:54 2008	(r184453)
+++ stable/7/sys/amd64/amd64/local_apic.c	Wed Oct 29 21:08:34 2008	(r184454)
@@ -401,7 +401,10 @@ lapic_setup_clock(void)
 		lapic_timer_hz = hz * 2;
 	else
 		lapic_timer_hz = hz * 4;
-	stathz = lapic_timer_hz / (lapic_timer_hz / 128);
+	if (lapic_timer_hz < 128)
+		stathz = lapic_timer_hz;
+	else
+		stathz = lapic_timer_hz / (lapic_timer_hz / 128);
 	profhz = lapic_timer_hz;
 	lapic_timer_period = value / lapic_timer_hz;
 

Modified: stable/7/sys/i386/i386/local_apic.c
==============================================================================
--- stable/7/sys/i386/i386/local_apic.c	Wed Oct 29 20:19:54 2008	(r184453)
+++ stable/7/sys/i386/i386/local_apic.c	Wed Oct 29 21:08:34 2008	(r184454)
@@ -403,7 +403,10 @@ lapic_setup_clock(void)
 		lapic_timer_hz = hz * 2;
 	else
 		lapic_timer_hz = hz * 4;
-	stathz = lapic_timer_hz / (lapic_timer_hz / 128);
+	if (lapic_timer_hz < 128)
+		stathz = lapic_timer_hz;
+	else
+		stathz = lapic_timer_hz / (lapic_timer_hz / 128);
 	profhz = lapic_timer_hz;
 	lapic_timer_period = value / lapic_timer_hz;

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