From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Philippe Gerum <rpm@xenomai.org>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-core] kernel threads crash
Date: Tue, 19 Apr 2011 10:42:02 +0200 [thread overview]
Message-ID: <4DAD4ADA.4040007@domain.hid> (raw)
In-Reply-To: <1303200143.2096.11.camel@domain.hid>
Philippe Gerum wrote:
> On Tue, 2011-04-19 at 09:58 +0200, Jesper Christensen wrote:
>> Great thanks, but i can't help wondering if the problems i'm seeing are
>> related to some of my userspace programs using fp.
>
> I don't think so. The switchtest programs exercises the FPU hardware in
> a certain way to make sure it is available in real-time mode from kernel
> space (which is an utterly crappy legacy, but we will have to deal with
> it until Xenomai 3.x). As far as I can see from your .config, you can't
> have such support, so switchtest was basically trying to test an
> inexistent feature.
In fact, switchtest whether Xenomai FPU switch routines work when the
Linux kernel itself uses FPU in kernel-space. Currently, the only place
when this happens is in the RAID code: x86 uses mmx/sse, and some power
pcs use altivec. Some powerpc also fix unaligned accesses to floating
point data in kernel-space, I do not know if this may interfere, which
is why the powerpc code is compiled even without RAID.
--
Gilles.
next prev parent reply other threads:[~2011-04-19 8:42 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-08 12:58 [Xenomai-core] kernel threads crash Jesper Christensen
2011-04-08 13:12 ` Philippe Gerum
2011-04-08 13:20 ` Jesper Christensen
2011-04-08 13:39 ` Philippe Gerum
2011-04-08 13:47 ` Jesper Christensen
2011-04-08 14:33 ` Jesper Christensen
2011-04-11 14:13 ` Jesper Christensen
2011-04-11 14:18 ` Philippe Gerum
2011-04-11 14:20 ` Jesper Christensen
2011-04-11 14:27 ` Philippe Gerum
2011-04-11 14:32 ` Jesper Christensen
2011-04-11 14:39 ` Philippe Gerum
2011-04-11 14:49 ` Jesper Christensen
2011-04-11 15:31 ` Jesper Christensen
2011-04-12 13:31 ` Jesper Christensen
2011-04-12 13:39 ` Gilles Chanteperdrix
2011-04-12 13:40 ` Jesper Christensen
2011-04-12 13:40 ` Jan Kiszka
2011-04-12 13:45 ` Jesper Christensen
2011-04-12 14:09 ` Jesper Christensen
2011-04-12 14:14 ` Jan Kiszka
2011-04-12 14:21 ` Jesper Christensen
2011-04-12 15:24 ` Jan Kiszka
2011-04-12 15:50 ` Jesper Christensen
2011-04-19 7:26 ` Jesper Christensen
2011-04-19 7:39 ` Philippe Gerum
2011-04-19 7:58 ` Jesper Christensen
2011-04-19 8:02 ` Philippe Gerum
2011-04-19 8:42 ` Gilles Chanteperdrix [this message]
2011-04-19 9:29 ` Philippe Gerum
2011-04-19 9:30 ` Philippe Gerum
2011-04-19 9:34 ` Jesper Christensen
2011-04-11 14:34 ` Philippe Gerum
2011-04-11 14:35 ` Jesper Christensen
2011-04-11 14:23 ` Philippe Gerum
2011-04-11 14:36 ` Gilles Chanteperdrix
2011-04-08 19:15 ` Richard Cochran
2011-04-11 6:52 ` Jesper Christensen
2011-04-11 6:55 ` Richard Cochran
2011-04-11 6:59 ` Jesper Christensen
2011-04-11 9:18 ` Jan Kiszka
2011-04-11 9:26 ` Jesper Christensen
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