linux-kernel - Re: [PATCH v7 06/27] x86, 64bit: early #PF handler set page table

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Message-ID: <50D0DB1A.5010407@zytor.com>
Date:	Tue, 18 Dec 2012 13:07:38 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Jason Wessel <jason.wessel@...driver.com>,
	Jan Kiszka <jan.kiszka@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 06/27] x86, 64bit: early #PF handler set page table

On 12/18/2012 12:55 PM, Yinghai Lu wrote:
> On Tue, Dec 18, 2012 at 12:49 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> On 12/18/2012 12:43 PM, Yinghai Lu wrote:
> 
>>
>> That is putting the cart before the horse.  What is the specific requirement
>> with kgdb here (I didn't see any email on that, please don't have private
>> back conversations)?  Either way, however, kgdb is a tool to debug the
>> kernel... having it a barrier for proper functionality of the kernel is not
>> acceptable.
> 
> did not hear back from Jason or Jan.
> 
> Looks like last mail in LKML from Jason is about Oct 20
> 
> looks like kgdb is want DB, BP, and PF are set at first.
> 
> and just after that early_param for kgdbwait will get into to hold the kernel.
> 
> then command from kgdb could dump ram etc.
> 

So in that case, kgdb is broken and will need to be fixed up.  That
happens all the time with debugging tools.

	-hpa

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