From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Fri, 06 Jan 2012 16:04:16 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] IRQ issue
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To: Terry Fryar <terry.fryar@domain.hid>
Cc: xenomai@xenomai.org

On 01/06/2012 03:11 PM, Terry Fryar wrote:
> Using Xen 2.6 with 2.6.38 kernel, have a kernel module with an ISR
> registered using rtdm_irq_request() that schedules a work queue.  This queue
> thread makes an spi call.

If the work queue you schedule is a linux work queue, that is not going
to work, for the same reason as in the last e-mail: you can not call
services interacting with Linux scheduler in xenomai context. So, if you
need an spi driver for real-time drivers or applicaitons, you have to
write one for the RTDM skin without using Linux services. There is no
way around.

> Not sure what this one means??  I see the "cpu_idle", and I vaguely recall
> some issue with that....but I don't remember what this was?

The cpu is idle most of the time, so, the idle function is the function
the most likely to be interrupted by an interrupt.

-- 
					    Gilles.