Re: [Xenomai-core] [PATCH] Fix ppc fpu support

[Heikki Lindholm <holindho@domain.hid>]

Philippe Gerum 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 having trouble with X and Xenomai, give this a shot.
>>
> 
> Merged in r383, thanks.

On a related note, how do you think patches to Linux kernel that don't 
fit into I-pipe should be handled? Put into patches directory 
separately? There are now at least two instances for 2.6.14/ppc: the fpu 
bug that I already posted on this thread and the ppc64 UP building bug 
that effectively makes impossible to build I-pipe 2.6.14 for UP on ppc64.

-- Heikki Lindholm