Not getting MCP with RT_PREEMPT on MPC8313

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Hi

I am using 2.6.33.7-rt29 with RT_PREEMPT for

I have a custom MPC8313 board with a signal on the IRQ0/MCP_IN pin.

With 2.6.33.7-rt29 configured with RT_PREEMPT I don't get a
machine_check_exception when the IRQ0 pin goes low.
Configuring the same kernel with PREEMPT instead, I get the
machine_check_exception.
Using 2.6.33 configured with PREEMPT also works.

Any known issues?  I have been digging a bit around, and is open to
suggestions on where to go next.

/Esben

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