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Date: Fri, 06 Jan 2006 20:42:13 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-core] [PATCH] Fix ppc fpu support
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To: Heikki Lindholm <holindho@domain.hid>
Cc: xenomai@xenomai.org

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Jan Kiszka wrote:
> Heikki Lindholm wrote:
> 
>>Jan Kiszka kirjoitti:
>>
>>
>>>Heikki Lindholm wrote:
>>>
>>>
>>>>Xenomai might preempt linux when linux has cleared a tasks MSR_FP, but
>>>>not yet set last_task_used_math to NULL. As a result the tasks MSR_FP
>>>>will get set, although it should be cleared. If the task happens to hit
>>>>one of the codepaths that save FPU state if MSR_FP is set, the wrong FPU
>>>>state might be saved to the task. The attached patch should fix this. I
>>>>couldn't try it on most recent Xenomai trunk, because latency wouldn't
>>>>build anymore. However, I see no reason it shouldn't work. All thee
>>>
>>>
>>>
>>>Is it still broken with latest revision 376? Philippe had merged the fix
>>>for my mess, and it worked at least for 2.6 on my box again.
>>
>>
>>I'd say this has been unchanged since the beginning (0.9?).
>>
> 
> 
> Then, what latency are we talking about? My last modifications went to
> src/testsuite/latency. Did you mean ksrc/skins/native/demos/latency.c?
> 

BTW, the latter compiles fine for me as well (in my case by providing
the full path to xeno-config via XENO_CONFIG to "make").

Jan

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