From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <51AF1F53.8060403@xenomai.org>
Date: Wed, 05 Jun 2013 13:21:55 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] [POWERPC] bug alert with
 CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4
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To: Philippe Gerum <rpm@xenomai.org>
Cc: "Xenomai@xenomai.org" <Xenomai@xenomai.org>

On 06/05/2013 01:20 PM, Gilles Chanteperdrix wrote:

> 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?
> 

Sorry, misread the code.

-- 
                                                                Gilles.