From: Bjorn Helgaas <bjorn.helgaas@hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: BUG 2.6.7 hangs on boot (rx2600)
Date: Wed, 23 Jun 2004 22:50:43 +0000 [thread overview]
Message-ID: <200406231650.43664.bjorn.helgaas@hp.com> (raw)
In-Reply-To: <20040622061505.GA23075@cup.hp.com>
On Wednesday 23 June 2004 8:26 am, Tian, Kevin wrote:
> I'm suspecting line in ia64_switch_to:
> /*
> * If we've already mapped this task's page, we can skip doing it
> again.
> */
> (p6) cmp.eq p7,p6=r27,r27 <----- Should here cmp.eq.unc be used
> instead? No time to test it now...
Your change evidently solves the problem, but I don't understand
how. Can you enlighten me? Here's the essence of the code:
cmp.eq p7,p6=r25,in0
(p6) cmp.eq p7,p6=r26,r27
(p6) br.cond.dpnt .map
As I understand it, adding ".unc" to the second cmp instruction
should only make a difference when p6=0. In that case, after
the old cmp (no ".unc") we'd have p6=0 and p7=1, while after
the new cmp (with ".unc") we'd have p6=0 and p7=0. But we
never test p7, so I don't see what difference it makes.
next prev parent reply other threads:[~2004-06-23 22:50 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-22 6:15 BUG 2.6.7 hangs on boot (rx2600) Grant Grundler
2004-06-22 13:50 ` Jesse Barnes
2004-06-22 14:51 ` Grant Grundler
2004-06-22 15:59 ` Bjorn Helgaas
2004-06-22 21:16 ` Grant Grundler
2004-06-22 21:23 ` Bjorn Helgaas
2004-06-22 22:28 ` Grant Grundler
2004-06-22 22:30 ` Grant Grundler
2004-06-22 22:38 ` Arun Sharma
2004-06-23 14:26 ` Tian, Kevin
2004-06-23 17:03 ` Jesse Barnes
2004-06-23 22:50 ` Bjorn Helgaas [this message]
2004-06-24 2:57 ` Tian, Kevin
2004-06-25 0:36 ` Chen, Kenneth W
2004-06-25 16:31 ` Chen, Kenneth W
2004-06-26 5:29 ` David Mosberger
2004-06-26 5:48 ` Chen, Kenneth W
2004-06-26 5:55 ` David Mosberger
2004-06-29 15:09 ` Chen, Kenneth W
2004-06-29 15:34 ` Chen, Kenneth W
2004-06-29 17:32 ` Jesse Barnes
2004-06-29 17:40 ` Chen, Kenneth W
2004-06-29 17:45 ` Jesse Barnes
2004-06-29 18:03 ` Chen, Kenneth W
2004-06-29 18:13 ` Jesse Barnes
2004-06-29 18:19 ` Chen, Kenneth W
2004-06-29 21:19 ` David Mosberger
2004-06-29 23:18 ` David Mosberger
2004-06-30 16:17 ` Jesse Barnes
2004-06-30 18:11 ` Jesse Barnes
2004-07-06 23:43 ` David Mosberger
2004-07-06 23:45 ` David Mosberger
2004-07-07 16:20 ` Jesse Barnes
2004-07-07 23:56 ` Jesse Barnes
2004-07-08 18:13 ` Jesse Barnes
2004-07-08 18:31 ` Chen, Kenneth W
2004-07-08 18:39 ` Jesse Barnes
2004-07-08 18:43 ` David Mosberger
2004-07-08 18:46 ` Jesse Barnes
2004-07-12 17:59 ` Jesse Barnes
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