linux-kernel - Re: [PATCH 1/3] KGDB: Major refactoring

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Date:	Wed, 06 Feb 2008 18:31:33 -0600
From:	Jason Wessel <jason.wessel@...driver.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jan Kiszka <jan.kiszka@....de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kgdb-bugreport@...ts.sourceforge.net,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 1/3] KGDB: Major refactoring

Ingo Molnar wrote:
> * Jan Kiszka <jan.kiszka@....de> wrote:
>
>   
>> As most changes are tightly coupled, this refactoring patch for
>> KGDB_8250 as well as the core and the new KGDBOC driver comes as a
>> single chunk. The changes are:
>>  - Reorganized configuration: I/O drivers can be independently
>>    configured as module or built-in
>>  - Dynamic reconfiguration for KGDB_8250 (just like for KGDBOC)
>>  - Reworked KGDB_8250 configuration string format
>>  - attachwait removed, arming the debugger via assigning an I/O driver
>>    implies "attachwait"
>>  - Cleaned up I/O driver managment of the core
>>  - Matured the various boot-up, configure, unconfigure code paths for
>>    both I/O drivers
>>  - IRQ vs. KGDB_CONSOLE-output SMP race fixed for KGDB_8250
>>  - Reduced and cleaned up hooks into serial_core/8250
>>  - Kconfig cleanups
>>     
>
> great stuff! I've picked these cleanups up into x86.git. (will pick up 
> Jason's commits too)
>
> Could you try something else too perhaps, which would be way useful for 
> me: to add a sysctl flag (or something like that) to change kgdboc to 
> accept a Ctrl-C and break into kgdb mode? [this means a simple Ctrl-C on 
> a kgdboc line would break into KGDB as well - but that would be an 
> acceptable price.] Right now kgdboc just hangs when gdb attaches - i 
> have to generate a SysRq sequence via a terminal emulator to break it 
> into KGDB mode.
>   

FYI, even if you were to hack in a control-c vs sysrq, gdb will still
hang on connect because it does not issue a break of any kind when it
connects.  It assumes the connection is in a usable state.

The proxy spliter automatically sends the break (or in the current case
the sysrq g)
> This would make kgdboc way more practical without having to resort to a 
> protocol splitting proxy, etc.
>
> 	Ingo
>   


Jason.
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