linux-kernel - Re: [PATCH] mac80211_hwsim: use dyndbg for debug messages

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Date:   Wed, 28 Jun 2017 17:03:57 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Joe Perches <joe@...ches.com>, Lubomir Rintel <lkundrak@...sk>
Cc:     Kalle Valo <kvalo@...eaurora.org>, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mac80211_hwsim: use dyndbg for debug messages

On Wed, 2017-06-28 at 06:37 -0700, Joe Perches wrote:
> On Wed, 2017-06-28 at 15:17 +0200, Lubomir Rintel wrote:
> > The mac80211_hwsim doesn't offer a way to disable the debugging
> > output.
> > Unfortunately, it's pretty chatty, dumping a  lot of stuff into the
> > message
> > buffer.
> > 
> > This patch changes it to use dyndbg for controlling the debug
> > output.
> > It's disabled by default, but can be enabled by a module parameter
> > (1),
> > at runtime (2) or persisted in modprobe.conf (3).
> > 
> >   (1) modprobe mac80211_hwsim dyndbg=+p
> >   (2) echo "module mac80211_hwsim +p"
> > >/sys/kernel/debug/dynamic_debug/control
> >   (3) echo "options mac80211_hwsim dyndbg=+p"
> > >>/etc/modprobe.d/my.conf
> 
> I wonder about the value at all of the 2 forms:
> 
> wiphy_dbg	-> only with #define DEBUG or dynamic_debug
> wiphy_debug	-> always emitted at KERN_DEBUG
> 
> Is there any real value in wiphy_debug?
> 
> Should it just be converted to
> 
> #define wiphy_debug	wiphy_dbg

I don't think it should, there are some messages that we'd probably
just have to give a higher priority if we did this.

johannes