From: Hannes Reinecke <Hannes.Reinecke@suse.de>
To: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Dumb question: BKL on reboot ?
Date: Wed, 20 Aug 2003 12:22:09 +0200 [thread overview]
Message-ID: <3F434BD1.9050704@suse.de> (raw)
Hiya,
I've got a dumb question: Why is the BKL held on entering sys_reboot()
in kernel/sys.c:405 ?
It is getting especially interesting on SMP, when one cpu is entering
sys_reboot, acquires the BKL and then waits (via machine_restart) for
all other cpus to shut down. If any of the other cpus is executing a
task which also needs the BKL, we have a nice deadlock.
We've seen this here on 2-way s390, where the other cpu tried to execute
kupdated() (what did it try that for? Anyway...), which of course
resulted in a deadlock.
Any enlightenment welcome.
Cheers,
Hannes
P.S.: Please cc me directly, I'm not subscribed.
--
Dr. Hannes Reinecke hare@suse.de
SuSE Linux AG S390 & zSeries
Deutschherrnstr. 15-19 +49 911 74053 688
90429 Nürnberg http://www.suse.de
next reply other threads:[~2003-08-20 10:22 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-20 10:22 Hannes Reinecke [this message]
2003-08-20 18:29 ` Dumb question: BKL on reboot ? Andrew Morton
2003-08-20 18:35 ` David S. Miller
2003-08-20 20:23 ` Dave Hansen
2003-08-21 8:05 ` Hannes Reinecke
2003-08-21 15:41 ` Andrea Arcangeli
2003-08-21 15:55 ` Hannes Reinecke
2003-08-21 16:39 ` Andrea Arcangeli
2003-08-21 16:58 ` Andrea Arcangeli
2003-08-22 6:39 ` Hannes Reinecke
2003-08-22 13:57 ` Andrea Arcangeli
2003-08-24 21:43 ` Andrea Arcangeli
2003-08-21 15:33 ` Andrea Arcangeli
[not found] <3F434BD1.9050704@suse.de.suse.lists.linux.kernel>
2003-08-20 10:49 ` Andi Kleen
2003-08-20 11:51 ` Hannes Reinecke
2003-08-20 12:03 ` Andi Kleen
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