On Fri, 2 May 2008, Andi Kleen wrote:
> +static void stack_overflow(void)
> +{
> +	printk("low stack detected by irq handler\n");

Needs a KERN_ERR

> +		/* Execute warning on interrupt stack */
> +		if (unlikely(overflow))
> +			call_on_stack2(stack_overflow, isp, 0, 0);
> +
> +		call_on_stack2(desc->handle_irq, isp, irq, desc);

arch/x86/kernel/irq_32.c:148: warning: passing argument 2 of Ącall_on_stack2˘ makes integer from pointer without a cast
arch/x86/kernel/irq_32.c:150: warning: passing argument 2 of Ącall_on_stack2˘ makes integer from pointer without a cast
arch/x86/kernel/irq_32.c:150: warning: passing argument 4 of Ącall_on_stack2˘ makes integer from pointer without a cast

>  	} else
>  #endif
> -		desc->handle_irq(irq, desc);
> +	{
> +		/* AK: Slightly bogus here */

Bogus comment. This applies to both the !4KSTACKS and the overflow of
the irq stack in the 4KSTACKS case.

> +		if (overflow)

unlikely(overflow) ?

> +			stack_overflow();
> + 		desc->handle_irq(irq, desc);

Thanks,

	tglx