linux-kernel - Re: [PATCH 09/11] soundwire: intel: add dynamic debug trace for clock-stop invalid configs

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Date:   Tue, 1 Sep 2020 16:37:16 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Bard Liao <yung-chuan.liao@...ux.intel.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        rander.wang@...ux.intel.com, ranjani.sridharan@...ux.intel.com,
        hui.wang@...onical.com, sanyog.r.kale@...el.com,
        mengdong.lin@...el.com, bard.liao@...el.com
Subject: Re: [PATCH 09/11] soundwire: intel: add dynamic debug trace for
 clock-stop invalid configs

On 31-08-20, 10:15, Pierre-Louis Bossart wrote:
> 
> > > > > > > Detect cases where the clock is assumed to be stopped but the IP is
> > > > > > > not in the relevant state, and add a dynamic debug trace.
> > > > > > 
> > > > > > you meant a debug print..and it looks like error print below (also in title).
> > > > > 
> > > > > I don't understand the comment. Is the 'trace' confusing and are you asking
> > > > > to e.g. change the commit message to 'add dynamic debug log'?
> > > > 
> > > > Question is what is dynamic about this?
> > > dev_dbg() is part of the kernel dynamic debug capability...
> > > 
> > > https://www.kernel.org/doc/html/latest/admin-guide/dynamic-debug-howto.html
> > > 
> > > Not sure what you are asking here?
> > 
> > :-| where is dev_dbg() ?
> > 
> > See [1]
> 
> > 
> > [1]
> > 
> > > +			dev_err(dev, "%s invalid configuration, clock was not stopped", __func__);
> > 
> >                          ^^^^^^^
> 
> it's still a log using the "dynamic debug" framework.
> 
> Again, what are you asking us to fix?

Ah you are really testing my patience!

The title says "dynamic debug" and then you use a dev_err which is *not*
part of dynamic debug as it is printed always and cannot be dynamically
enabled and disabled!

See Documentation/admin-guide/dynamic-debug-howto.rst:

"Dynamic debug is designed to allow you to dynamically enable/disable
kernel code to obtain additional kernel information.  Currently, if
``CONFIG_DYNAMIC_DEBUG`` is set, then all ``pr_debug()``/``dev_dbg()`` and
``print_hex_dump_debug()``/``print_hex_dump_bytes()`` calls can be dynamically
enabled per-callsite."

No dev_err here!

-- 
~Vinod