From: Yann.LEPROVOST@wavecom.fr
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Daniel Walker <dwalker@mvista.com>,
linux-kernel@vger.kernel.org, linux-kernel-owner@vger.kernel.org,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Ingo's realtime_preempt patch causes kernel oops
Date: Tue, 23 May 2006 19:10:30 +0200 [thread overview]
Message-ID: <OFCEBD2C92.B402353B-ONC1257177.005E2101-C1257177.005EEA9E@wavecom.fr> (raw)
In-Reply-To: <1148403642.22855.12.camel@localhost.localdomain>
Currently there are only system timer and debug serial unit registered on
irq line 1.
Debug serial unit is used as the console !
Steven Rostedt
<rostedt@goodmis.
org> To
Sent by: Yann.LEPROVOST@wavecom.fr
linux-kernel-owne cc
r@vger.kernel.org Daniel Walker <dwalker@mvista.com>,
linux-kernel@vger.kernel.org, Ingo
Molnar <mingo@elte.hu>, Thomas
23/05/2006 19:00 Gleixner <tglx@linutronix.de>
Subject
Re: Ingo's realtime_preempt patch
causes kernel oops
On Tue, 2006-05-23 at 18:27 +0200, Yann.LEPROVOST@wavecom.fr wrote:
> I forgot to say that I let SA_SHIRQ as the IRQ line is shared...
> It seems to work correctly...
What shares it?
Reason I ask, is that this irq is now running in true interrupt context,
and that on PREEMPT_RT the spin_locks are mutexes and can schedule. So
if another device is sharing this irq, then its interrupt handler will
be running in interrupt context, and if it grabs a spin_lock than is not
a raw_spinlock_t then you will have a crash.
This won't be a problem if you only turn on Hard irqs as threads and
don't do the PREEMPT_RT.
-- Steve
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next prev parent reply other threads:[~2006-05-23 17:16 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-23 13:40 Ingo's realtime_preempt patch causes kernel oops Yann.LEPROVOST
2006-05-23 14:09 ` Steven Rostedt
2006-05-23 14:19 ` Steven Rostedt
2006-05-23 14:26 ` Thomas Gleixner
2006-05-23 15:33 ` Daniel Walker
2006-05-23 16:02 ` Steven Rostedt
2006-05-23 16:27 ` Yann.LEPROVOST
2006-05-23 17:00 ` Steven Rostedt
2006-05-23 17:10 ` Yann.LEPROVOST [this message]
2006-05-23 18:21 ` Steven Rostedt
2006-05-24 8:06 ` Yann.LEPROVOST
2006-05-24 12:55 ` Steven Rostedt
2006-05-24 13:13 ` Thomas Gleixner
2006-05-24 15:32 ` Sven-Thorsten Dietrich
2006-05-24 15:52 ` Steven Rostedt
2006-05-24 16:03 ` Thomas Gleixner
2006-05-24 16:38 ` Steven Rostedt
2006-05-24 16:55 ` Thomas Gleixner
2006-05-24 17:09 ` Sven-Thorsten Dietrich
2006-05-24 16:06 ` Daniel Walker
2006-05-24 13:58 ` Yann.LEPROVOST
2006-05-24 16:43 ` Esben Nielsen
2006-05-24 17:06 ` Thomas Gleixner
2006-05-24 18:00 ` Sven-Thorsten Dietrich
2006-05-30 10:00 ` RT_PREEMPT problem with cascaded irqchip Yann.LEPROVOST
2006-05-30 10:27 ` Thomas Gleixner
2006-05-30 10:26 ` Yann.LEPROVOST
2006-05-30 11:22 ` Thomas Gleixner
2006-05-30 14:44 ` Yann.LEPROVOST
2006-05-30 23:25 ` Thomas Gleixner
2006-05-31 8:26 ` Yann.LEPROVOST
2006-05-24 17:30 ` Ingo's realtime_preempt patch causes kernel oops Sven-Thorsten Dietrich
[not found] <OF928FB2B7.5CE25C69-ONC1257177.00596B7A-C1257177.005AAA6F@wavecom.fr>
2006-05-23 16:38 ` Daniel Walker
2006-05-23 16:44 ` Thomas Gleixner
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