fix "struct irq_desc"

Martin> In linux-2.6.0-test2-ia64-030729 configured for generic ia64, Martin> asm-ia64/machvec.h returns a 'struct irq_desc'. There is a forward Martin> declaration for the struct, but it is never actually defined under Martin> that name, only as irq_desc_t.

Martin> This means that the type of ia64_mv_irq_desc is wrong, which causes Martin> the build to break in some files that are built with -Werror. Really Martin> this is incorrect even for non-generic builds although it does not Martin> actually fail.

Martin> This patch puts in both the struct name and _t name:

Martin> --- linux-2.6.0test2-ia64/include/linux/irq.h.~1~ 2003-07-29 12:05:34.000000000 +1000
Martin> +++ linux-2.6.0test2-ia64/include/linux/irq.h 2003-08-06 16:33:30.000000000 +1000
Martin> @@ -56,7 +56,7 @@ typedef struct hw_interrupt_type hw_irq Martin> *
Martin> * Pad this out to 32 bytes for cache and indexing reasons. Martin> */
Martin> -typedef struct {
Martin> +typedef struct irq_desc {
Martin> unsigned int status; /* IRQ status */
Martin> hw_irq_controller *handler;
Martin> struct irqaction *action; /* IRQ action list */

Martin> Perhaps it would be better to make everything use the Martin> irq_desc_t name? That would require a somewhat larger Martin> rearrangement of the headers to make it visible at that Martin> point, but I can do that if desired.

Can you run it past Andrew Morton and see if he accepts this patch? I think it makes tons of sense on the grounds that in Linux typedef's are usually frowned upon (exactly because they can't be forward-declared). I dropped that patch a while ago because I thought it wasn't needed anymore (and I was trying to get sync'd up with Linus' tree).

	--david