Re: [PATCH] kdb: Avoid using dbg_io_ops until it is initialized

[Tim Bird <tim.bird@am.sony.com>]

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

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