Re: [PATCH] softirq softlockup debugging

[Arjan van de Ven <arjan@linux.intel.com>]

Vegard Nossum wrote:

Hi

I like the general idea a lot; some comments below on the patch
> 
> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> index f1fc747..97d47cf 100644
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -296,6 +296,9 @@ extern void softirq_init(void);
>  extern void raise_softirq_irqoff(unsigned int nr);
>  extern void raise_softirq(unsigned int nr);
>  
> +#ifdef CONFIG_SOFTLOCKUP_SOFTIRQ_DEBUG
> +extern void *get_last_softirq_action(int cpu);
> +#endif

you don't need to ifdef prototypes....
(there's only one exception: if the prototype uses types that are ifdef'd themselves, but that's not here)


In general... I don't like that this is a config option. I mean... is there a really strong
reason why this shouldn't just always be there?