linux-kernel - Re: 2.6.18-rc4-mm1 - time moving at 3x speed, bisect finished

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Message-ID: <Pine.LNX.4.64.0608201859130.6762@scrub.home>
Date:	Sun, 20 Aug 2006 19:06:21 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Helge Hafting <helgehaf@...el.hist.no>
cc:	Andi Kleen <ak@...e.de>,
	Helge Hafting <helge.hafting@...el.hist.no>,
	john stultz <johnstul@...ibm.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	thunder7@...all.nl
Subject: Re: 2.6.18-rc4-mm1 - time moving at 3x speed, bisect finished

Hi,

On Sat, 19 Aug 2006, Helge Hafting wrote:

> > Can you narrow it down to a specific patch in -mm? 
> >
> The guilty patch is:
> ntp-add-ntp_update_frequency.patch

That's really weird, I don't really have an idea why it should go wrong 
there, could you please try the patch below and send me the kernel output?
Thanks.

bye, Roman

---
 kernel/time/ntp.c |    9 +++++++++
 1 file changed, 9 insertions(+)

Index: linux-2.6-mm/kernel/time/ntp.c
===================================================================
--- linux-2.6-mm.orig/kernel/time/ntp.c
+++ linux-2.6-mm/kernel/time/ntp.c
@@ -46,12 +46,21 @@ long time_adjust;
 static void ntp_update_frequency(void)
 {
 	tick_length_base = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) << TICK_LENGTH_SHIFT;
+	printk("%Lx,", tick_length_base);
 	tick_length_base += (s64)CLOCK_TICK_ADJUST << TICK_LENGTH_SHIFT;
+	printk("%Lx,", tick_length_base);
 	tick_length_base += (s64)time_freq << (TICK_LENGTH_SHIFT - SHIFT_NSEC);
+	printk("%Lx,", tick_length_base);
 
 	do_div(tick_length_base, HZ);
+	printk("%Lx\n", tick_length_base);
 
 	tick_nsec = tick_length_base >> TICK_LENGTH_SHIFT;
+	printk("u: %u.%06u, %ld.%04lu\n",
+		(u32)(tick_length_base >> TICK_LENGTH_SHIFT),
+		(u32)(((tick_length_base & ((1ll << TICK_LENGTH_SHIFT) - 1)) * 1000000) >> TICK_LENGTH_SHIFT),
+		time_offset >> SHIFT_UPDATE,
+		((time_offset & ((1 << SHIFT_UPDATE) - 1)) * 1000) >> SHIFT_UPDATE);
 }
 
 /**
-
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