linux-kernel - Re: [Kgdb-bugreport] [PATCH 4/4] kgdb: x86: Detach gdb if machine shuts down or reboots

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Date:	Tue, 20 Mar 2012 15:18:57 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Jason Wessel <jason.wessel@...driver.com>
CC:	Jan Kiszka <jan.kiszka@...mens.com>,
	"kgdb-bugreport@...ts.sourceforge.net" 
	<kgdb-bugreport@...ts.sourceforge.net>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Kgdb-bugreport] [PATCH 4/4] kgdb: x86: Detach gdb if machine
 shuts down or reboots

Hello.

On 20-03-2012 5:00, Jason Wessel wrote:

>> An arch-independent hook has its advantages, no question. Maybe we
>> should just start this way and then evolved on top as needed.

> Sounds good to me.  I added the reboot notifier patch into the merge queue for kgdb/kdb.

>> I was wondering why those other archs do not use the notifier. Maybe one
>> motivation is to avoid that too much code is excluded from the debugger
>> by detaching too early. Could possibly be addressed by making
>> detach-on-reboot runtime configurable.

> There really isn't a whole lot of code between reboot hook invoked from kernel_restart_prepare(),
> and the place where the reset is invoked.  Specifically it looked like:

>          usermodehelper_disable();
>          device_shutdown();
>          syscore_shutdown();
>          machine_restart(cmd);

> Attached is the patch you asked for the conditional behavior with respect to the reboot hook.

    You forgot to attach it?

> This also implements the ability to stop on a reboot that is not a panic().

WBR, Sergei
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