[PATCH] ARM: Allow machine to specify it's own IRQ handlers at run-time

[Russell King - ARM Linux]

On Mon, Dec 06, 2010 at 05:31:46PM +0800, Eric Miao wrote:
> Grrrr... wrong copy indeed. Corrected version below, I also made it less
> intrusive by judging on handle_arch_irq being NULL or not so to fall back
> to the original way of handling.
...
> diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
> index c09e357..4f446a2 100644
> --- a/arch/arm/kernel/entry-armv.S
> +++ b/arch/arm/kernel/entry-armv.S
> @@ -30,6 +30,13 @@
>   * Interrupt handling.  Preserves r7, r8, r9
>   */
>  	.macro	irq_handler
> +#ifdef CONFIG_MULTI_IRQ_HANDLER
> +	ldr	r1, =handle_arch_irq
> +	cmp	r1, #0
> +	movne	r0, sp
> +	adrne	lr, BSYM(9997f)
> +	ldrne	pc, [r1]
> +#endif

Except this won't - you're testing the address of handle_arch_irq for
NULL, which it'll never be.