Heikki Lindholm wrote:
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.
I'm going to put those patches on GNA, so that people can access to them
easily. I'm going to add a fix for x86 too, which is needed at least on
one of my boxen since 2.6.13 to make the PCI setup correct again.
Is this patch still the right one to fix the UP build on ppc64?
http://patchwork.ozlabs.org/linuxppc64/patchcontent?id=3178
-- Heikki Lindholm
--
Philippe.
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