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Date: Sat, 16 Aug 2008 15:32:39 -0700
From: <gregkh@...e.de>
To: jdike@...toit.com, akpm@...ux-foundation.org, gregkh@...e.de,
jdike@...ux.intel.com, linux-kernel@...r.kernel.org,
torvalds@...ux-foundation.org,
user-mode-linux-devel@...ts.sourceforge.net,
xiyou.wangcong@...il.com
Cc: <stable@...nel.org>, <stable-commits@...r.kernel.org>
Subject: patch uml-fix-bad-ntp-interaction-with-clock.patch added to 2.6.25-stable tree
This is a note to let you know that we have just queued up the patch titled
Subject: uml: fix bad NTP interaction with clock
to the 2.6.25-stable tree. Its filename is
uml-fix-bad-ntp-interaction-with-clock.patch
A git repo of this tree can be found at
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>From stable-bounces@...ux.kernel.org Tue Aug 5 13:14:46 2008
From: Jeff Dike <jdike@...toit.com>
Date: Tue, 5 Aug 2008 16:14:03 -0400
Subject: uml: fix bad NTP interaction with clock
To: stable@...nel.org
Cc: LKML <linux-kernel@...r.kernel.org>, uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Message-ID: <20080805201403.GA11734@...user-mode-linux.org>
Content-Disposition: inline
From: Jeff Dike <jdike@...toit.com>
commit cfd28f6695d0fc047478480791a21bdd4967f98e upstream
UML's supposed nanosecond clock interacts badly with NTP when NTP
decides that the clock has drifted ahead and needs to be slowed down.
Slowing down the clock is done by decrementing the cycle-to-nanosecond
multiplier, which is 1. Decrementing that gives you 0 and time is
stopped.
This is fixed by switching to a microsecond clock, with a multiplier
of 1000.
Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
Cc: WANG Cong <xiyou.wangcong@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
arch/um/kernel/time.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -74,7 +74,7 @@ static irqreturn_t um_timer(int irq, voi
static cycle_t itimer_read(void)
{
- return os_nsecs();
+ return os_nsecs() / 1000;
}
static struct clocksource itimer_clocksource = {
@@ -82,7 +82,7 @@ static struct clocksource itimer_clockso
.rating = 300,
.read = itimer_read,
.mask = CLOCKSOURCE_MASK(64),
- .mult = 1,
+ .mult = 1000,
.shift = 0,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
Patches currently in stable-queue which might be from jdike@...toit.com are
queue-2.6.25/uml-fix-build-when-slob-is-enabled.patch
queue-2.6.25/uml-fix-bad-ntp-interaction-with-clock.patch
queue-2.6.25/uml-physical-memory-shouldn-t-include-initial-stack.patch
queue-2.6.25/uml-track-and-make-up-lost-ticks.patch
queue-2.6.25/uml-missed-kmalloc-in-pcap_user.c.patch
queue-2.6.25/uml-deal-with-host-time-going-backwards.patch
queue-2.6.25/uml-deal-with-inaccessible-address-space-start.patch
queue-2.6.25/uml-missing-export-of-csum_partial-on-uml-amd64.patch
queue-2.6.25/uml-memcpy-export-needs-to-follow-host-declaration.patch
queue-2.6.25/uml-stub-needs-to-tolerate-sigwinch.patch
queue-2.6.25/uml-work-around-broken-host-ptrace_sysemu.patch
queue-2.6.25/uml-fix-gcc-ices-and-unresolved-externs.patch
queue-2.6.25/uml-fix-boot-crash.patch
--
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