On Wed, Sep 07, 2011 at 11:25:29AM +0200, Thomas Gleixner wrote:
> This smells badly like the problem we've seen on x86 before. And
> looking at the arm SMP boot code:
>
> asmlinkage void __cpuinit secondary_start_kernel(void)
> {
> .....
>
> /*
> * Give the platform a chance to do its own initialisation.
> */
> platform_secondary_init(cpu);
>
> /*
> * Enable local interrupts.
> */
> notify_cpu_starting(cpu);
> local_irq_enable();
>
> Here we enable interrupts, but the CPU is neither online nor active.
>
> local_fiq_enable();
That's intentional. Some of the code below needs IRQs enabled.
I think we had this reported before and I got to the bottom of it - the
platform was doing something it shouldn't. I don't remember the details,
maybe when all the emails come through I can see the original bug report
I'll remember.
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