[POWERPC] fix cell pmu initialisation

[Arnd Bergmann]

On Tuesday 05 December 2006 05:54, Stephen Rothwell wrote:
> -int __init cbe_init_pm_irq(void)
> +static int __init cbe_init_pm_irq(void)
>  {
>         unsigned int irq;
>         int rc, node;
>  
> +       if (!machine_is(cell))
> +               return 0;
> +

This looks like a working fix at the moment, but it will break if we
add machine more descriptions have these registers.

I see three options here how to solve this:

1. export a method from cbe_regs.c to find out whether the pmd 
   regs are available and test that in cbe_init_pm_irq().
2. take you patch as is, with a comment hinting to fix it up
   when needed.
3. change cbe_init_pm_irq to be called explicitly from cbe_regs_init(),
   which already scans the device tree correctly.

	Arnd <><