Re: [PATCH v2 x86 1/2] fix page faults by nmiaction in nmi if kmemcheck is enabled

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

On Mon, 2012-03-05 at 18:05 +0800, Li Zhong wrote:
> +static struct nmiaction arch_trigger_all_cpu_bt_nmiaction = {
> +       .handler        = arch_trigger_all_cpu_backtrace_handler,
> +       .name           = "arch_bt",
> +};
> +
>  static int __init register_trigger_all_cpu_backtrace(void)
>  {
> -       register_nmi_handler(NMI_LOCAL, arch_trigger_all_cpu_backtrace_handler,
> -                               0, "arch_bt");
> +       register_nmi_handler(NMI_LOCAL, &arch_trigger_all_cpu_bt_nmiaction);
>         return 0;
>  } 

If you look at things like cpu_notifier() you can shorten this still:

#define nmi_notifier(t, fn, n)				\
do {							\
	static struct nmiaction fn##_na = {		\
		.handler = (fn),			\
		.name = (n),				\
	};						\
	register_nmi_handler((t), &fn##_na);		\
} while (0)

The whole thing then becomes:

  nmi_notifier(NMI_LOCAL, arch_trigger_all_cpu_backtrace_handler, "arch_bt");