From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 16 Nov 2006 16:50:31 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-help] Interrupt shield
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To: Sebastian Smolorz <ssm@domain.hid>
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Sebastian Smolorz wrote:
> Hello,
>=20
> can anybody confirm this behaviour? If I configure the I-shield into th=
e=20
> kernel and start the latency test the RT tasks have not activated T_SHI=
ELD=20
> although the documentation states it (and btw in rt_task_create this bi=
t is=20
> set). If I try to set T_SHIELD inside the display task, the system hang=
s, a=20
> soft lockup appears and sometimes a few correct lines of the display ta=
sk are=20
> printed, followed by the next lockup.
>=20
> Explainable?
>=20
> I'm testing on ARM with my S3C24xx I-pipe patch.

Have you tried over x86, too? The shield used to be off by default for
quite some time, and it's a fairly special feature. I wouldn't be
surprised if there is some regression sleeping. But it might also be an
ARM-specific issue.

Soft lockup sounds like the shield is not released appropriately again.
The tracer would visualise this nicely in verbose mode...

Jan


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