From: "Fabio M. Di NItto" <fabbione@fabbione.net>
To: sparclinux@vger.kernel.org
Subject: Re: [PATCH] debug: allow to retain boot console via boot option keep_bootcon
Date: Tue, 11 Jan 2011 05:24:48 +0000 [thread overview]
Message-ID: <4D2BE9A0.7030607@fabbione.net> (raw)
In-Reply-To: <1294649883-31614-1-git-send-email-fabbione@fabbione.net>
On 01/10/2011 11:11 PM, David Miller wrote:
> From: "Fabio M. Di Nitto" <fabbione@fabbione.net>
> Date: Mon, 10 Jan 2011 09:58:03 +0100
>
>> On some architectures, the boot process involves de-registering the boot
>> console (early boot), initialize drivers and then re-register the console.
>>
>> This mechanism introduces a window in which no printk can happen on the console
>> and messages are buffered and then printed once the new console is available.
>>
>> If a kernel crashes during this window, all it's left on the boot console
>> is "console [foo] enabled, bootconsole disabled" making debug of the crash
>> rather 'interesting'.
>>
>> By adding "keep_bootcon" option, do not unregister the boot console, that
>> will allow to printk everything that is happening up to the crash.
>>
>> The option is clearly meant only for debugging purposes as it introduces lots
>> of duplicated info printed on console, but will make bug report from users
>> easier as it doesn't require a kernel build just to figure out where we crash.
>>
>> Signed-off-by: Fabio M. Di Nitto <fabbione@fabbione.net>
>
> Acked-by: David S. Miller <davem@davemloft.net>
Thanks! David, is it an option for you to push it around together with
other sparc fixes or should I just submit it to kernel list? Either ways
work for me.
Fabio
next prev parent reply other threads:[~2011-01-11 5:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-10 8:58 [PATCH] debug: allow to retain boot console via boot option keep_bootcon Fabio M. Di Nitto
2011-01-10 22:11 ` [PATCH] debug: allow to retain boot console via boot option David Miller
2011-01-11 5:24 ` Fabio M. Di NItto [this message]
2011-01-11 7:02 ` David Miller
2011-01-11 8:05 ` [PATCH] debug: allow to retain boot console via boot option keep_bootcon Fabio M. Di Nitto
-- strict thread matches above, loose matches on Subject: below --
2011-01-11 8:57 Fabio M. Di Nitto
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