linux-kernel - Re: [PATCH 2.6.27-rc3 19/28] mdb: adding notify

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Date:	Sat, 16 Aug 2008 08:30:53 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	jmerkey@...fmountaingroup.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.27-rc3 19/28] mdb: adding notify_die handler for keyboard debugger entry

jmerkey@...fmountaingroup.com writes:
 
> +#if defined(CONFIG_MDB) || defined(CONFIG_MDB_MODULE)
> +	if (down && !rep && keycode == KEY_PAUSE)
> +        {
> +	   if (notify_die(DIE_KERNELDEBUG, NULL, get_irq_regs(),
> +                          0, -1, SIGINT) == NOTIFY_STOP)
> +	      return;
> +	}
> +#endif
> +
>  #ifdef CONFIG_MAGIC_SYSRQ	       /* Handle the SysRq Hack */
>  	if (keycode == KEY_SYSRQ && (sysrq_down || (down == 1 && sysrq_alt))) {
>  		if (!sysrq_down) {

A nicer alternative to adding an hook here would be to use 
register_sysrq_key() to register a sysrq key that triggers
the debugger.  That function is also already exported.

-Andi
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