[PATCH] [POWERPC] Add IRQSTACKS support on ppc32

[Paul Mackerras]

Kumar Gala writes:

> > Mostly looks great.  One minor nit is that this ifdef could disappear
> > entirely now:
> 
> How do you figure?  If we want to maintain it as a config option (for  
> at least 2.6.26) we  either need this ifdef or a dummy irq_ctx_init().

In include/asm-powerpc/irq.h we already have a dummy definition:

#ifdef CONFIG_IRQSTACKS

...

#else
#define irq_ctx_init()

#endif /* CONFIG_IRQSTACKS */

Paul.