Re: [PATCH] X86: reboot-notify additions

[Ingo Molnar <mingo@elte.hu>]

* Cliff Wickman <cpw@sgi.com> wrote:

> --- linux.orig/kernel/sys.c
> +++ linux/kernel/sys.c
> @@ -267,9 +267,16 @@ out_unlock:
>   *	reboot the system.  This is called when we know we are in
>   *	trouble so this is our best effort to reboot.  This is
>   *	safe to call in interrupt context.
> + *
> + *	The reboot_notifier_list uses a header for a blocking-form scan.
> + *	Use a local header suitable for a non-blocking scan.
>   */
>  void emergency_restart(void)
>  {
> +	struct raw_notifier_head rh;
> +
> +	rh.head = reboot_notifier_list.head;
> +	raw_notifier_call_chain(&rh, SYS_EMERGENCY, NULL);
>  	machine_emergency_restart();
>  }

that's still not a good idea - a blocking notifier list is that: a list 
that has stuff which might block. emergency_restart() might get called 
by non-blocking codepaths as well and it expects the restart to occur.

	Ingo