From: Ingo Molnar <mingo@elte.hu>
To: Andrew Morton <akpm@osdl.org>
Cc: Dave C Boutcher <sleddog@us.ibm.com>,
serue@us.ibm.com, michael@ellerman.id.au,
linuxppc64-dev@ozlabs.org, paulus@au1.ibm.com, anton@au1.ibm.com,
linux-kernel@vger.kernel.org
Subject: Re: 2.6.15-mm4 failure on power5
Date: Tue, 17 Jan 2006 09:17:49 +0100 [thread overview]
Message-ID: <20060117081749.GA10135@elte.hu> (raw)
In-Reply-To: <20060116170907.60149236.akpm@osdl.org>
* Andrew Morton <akpm@osdl.org> wrote:
> > If I revert just that patch, mm4 boots fine. Its really not obvious to
> > me at all why that patch is breaking things though...
>
> Yes, that is strange. I do recall that if something accidentally
> enables interrupts too early in boot, ppc64 machines tend to go
> comatose. But if we'd been running that code under
> local_irq_disable(), down() would have spat a warning.
perhaps it was just luck it worked so far, and the bug could have had
worse incarnations that the current clear hang if a certain generic
codepath is touched in a perfectly valid way. Does CONFIG_DEBUG_MUTEXES
(or any of the other debugging options) make any noise?
Ingo
next prev parent reply other threads:[~2006-01-17 8:17 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-16 6:35 2.6.15-mm4 failure on power5 Serge E. Hallyn
2006-01-16 7:05 ` Andrew Morton
2006-01-16 13:00 ` Michael Ellerman
2006-01-16 15:37 ` Serge E. Hallyn
2006-01-16 21:52 ` Dave C Boutcher
2006-01-17 1:09 ` Andrew Morton
2006-01-17 8:17 ` Ingo Molnar [this message]
2006-01-17 8:47 ` Andrew Morton
2006-01-17 16:52 ` Dave C Boutcher
2006-01-17 16:55 ` Dave C Boutcher
2006-01-18 6:40 ` Nathan Lynch
2006-01-18 7:07 ` Ingo Molnar
2006-01-18 7:53 ` Nathan Lynch
2006-01-18 8:08 ` Nathan Lynch
2006-01-17 12:22 ` Serge E. Hallyn
2006-01-17 13:32 ` Michael Ellerman
2006-01-17 14:00 ` Ingo Molnar
2006-01-18 0:19 ` Michael Ellerman
2006-01-18 3:32 ` Dave C Boutcher
2006-01-18 6:37 ` Ingo Molnar
2006-01-18 6:53 ` Andrew Morton
2006-01-18 7:04 ` Ingo Molnar
2006-01-18 7:28 ` Nathan Lynch
2006-01-18 7:37 ` Andrew Morton
2006-01-18 8:08 ` Ingo Molnar
2006-01-18 8:24 ` Andrew Morton
2006-01-18 9:02 ` [patch] work around ppc64 bootup bug by making mutex-debugging save/restore irqs Ingo Molnar
2006-01-18 9:18 ` [patch] turn on might_sleep() in early bootup code too Ingo Molnar
2006-01-18 10:35 ` Andrew Morton
2006-01-18 10:43 ` Ingo Molnar
2006-01-18 11:15 ` [patch] make bug messages more consistent Ingo Molnar
2006-01-19 4:39 ` [patch] turn on might_sleep() in early bootup code too Zwane Mwaikambo
2006-01-18 10:46 ` Nick Piggin
2006-01-18 11:07 ` Ingo Molnar
2006-01-18 12:53 ` [patch] add trylock_kernel() Ingo Molnar
2006-01-18 7:38 ` 2.6.15-mm4 failure on power5 Arjan van de Ven
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