linux-kernel - Re: [PATCH] kdb: Avoid using dbg_io

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Message-ID: <4F68F748.7010304@am.sony.com>
Date:	Tue, 20 Mar 2012 14:31:52 -0700
From:	Tim Bird <tim.bird@...sony.com>
To:	Jason Wessel <jason.wessel@...driver.com>
CC:	"kgdb-bugreport@...ts.sourceforge.net" 
	<kgdb-bugreport@...ts.sourceforge.net>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kdb:  Avoid using dbg_io_ops until it is initialized

On 03/20/2012 11:42 AM, Jason Wessel wrote:
> On 09/21/2011 03:19 PM, Tim Bird wrote:
>> This fixes a bug with setting a breakpoint during kdb initialization
>> (from kdb_cmds). Any call to kdb_printf() before the initialization
>> of the kgdboc serial console driver (which happens much later during
>> bootup than kdb_init), results in kernel panic due to the use of
>> dbg_io_ops before it is initialized.
> 
> I added this patch to the merge queue for the 3.4 kernel.
> 
> In the test and review of this patch, I thought there might be another
> race condition with kdb pager, but this is not the case.  The run time
> validation shows that the kdb pager can only get activated by entering
> and configuring the kdb shell and it is turned off on exit, so we are
> all set and no further changes are needed.

Thanks!
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Workgroup of the Linux Foundation
Senior Staff Engineer, Sony Network Entertainment
=============================

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