From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Philippe Gerum <rpm@xenomai.org>
Cc: "Xenomai@xenomai.org" <Xenomai@xenomai.org>
Subject: Re: [Xenomai] [POWERPC] bug alert with CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4
Date: Wed, 05 Jun 2013 13:20:49 +0200 [thread overview]
Message-ID: <51AF1F11.6040107@xenomai.org> (raw)
In-Reply-To: <51AF1561.6090401@xenomai.org>
On 06/05/2013 12:39 PM, Philippe Gerum wrote:
>
> A bad bug has been fixed in the unlocked context switching code for
> powerpc platforms. This affects all I-pipe patches for 3.4 kernels and
> above. The typical manifestation of this bug is random segmentation
> faults in user-space applications (sometimes after hours under stress
> load), usually the Xenomai-dependent ones.
>
> A work around not to change the kernel code is to disable
> CONFIG_XENO_HW_UNLOCKED_SWITCH. Patches for fixing this issue are
> available for 3.5.7 and above:
>
> http://git.xenomai.org/?p=ipipe.git;a=commit;h=614aa59453dacf7693fbb18229c27676c2803dbb
> http://git.xenomai.org/?p=ipipe.git;a=commit;h=04ea520ab96a16ec65529a2efed92c9a4a8bda34
Well, with these patches, the whole mm switch now runs with irqs off, is
this the intended effect?
--
Gilles.
next prev parent reply other threads:[~2013-06-05 11:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-05 10:39 [Xenomai] [POWERPC] bug alert with CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4 Philippe Gerum
2013-06-05 11:20 ` Gilles Chanteperdrix [this message]
2013-06-05 11:21 ` Gilles Chanteperdrix
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