linux-kernel - Re: enable dynamic debug

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Message-ID: <CAHhAz+jqL_Kj-kvzCDGyqgVyV+dTwq_P1juJ9oiumhT1jvsGag@mail.gmail.com>
Date:	Thu, 19 Nov 2015 14:17:21 +0530
From:	Muni Sekhar <munisekharrms@...il.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: enable dynamic debug - doubt

On Thu, Nov 19, 2015 at 2:38 AM, Peter Hurley <peter@...leysoftware.com> wrote:
>
> On 11/17/2015 07:40 AM, Muni Sekhar wrote:
> > [ Please keep me in CC as I'm not subscribed to the list]
> >
> >  Hello,
> >
> > The behaviour of dynamic debug prints are controlled via writing to a
> > control file in the 'debugfs'
> > filesystem(<debugfs>/dynamic_debug/control).
>
> That's not the only method. You'll want to read
> Documentation/dynamic-debug-howto.txt; specifically, "Debug Messages at
> Module Initialization Time" for ways to enable dynamic debug messages at
> module load time.
>
> Regards,
> Peter Hurley
>
> > Here I would like to know what order should the echo(for eg: echo -n
> > 'module sdhci +p' > /sys/kernel/debug/dynamic_debug/control) be
> > applied in relation to the module load - before or after?
>
>



I just glanced through the Documentation/dynamic-debug-howto.txt and
now I am able to enable "Debug Messages at Module Initialization
Time".

Thanks Peter & Andy for the clarification.


--
Thanks,
Sekhar
--
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