linux-kernel - Re: [PATCH v2] [media] vb2: core: Lower the log level of debug outputs

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Message-ID: <1496898982.1929.7.camel@perches.com>
Date:   Wed, 07 Jun 2017 22:16:22 -0700
From:   Joe Perches <joe@...ches.com>
To:     Tomasz Figa <tfiga@...gle.com>,
        Hirokazu Honda <hiroh@...omium.org>,
        Hans Verkuil <hverkuil@...all.nl>
Cc:     Pawel Osciak <pawel@...iak.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] [media] vb2: core: Lower the log level of debug
 outputs

On Thu, 2017-06-08 at 13:39 +0900, Tomasz Figa wrote:
> On Thu, Jun 8, 2017 at 12:24 PM, Hirokazu Honda <hiroh@...omium.org> wrote:
> > Hi,
> > 
> > I completely understand bitmask method now.
> > I agree to the idea, but it is necessary to change the specification of
> > a debug parameter.
> >  (We probably need to change a document about that?)
> > For example, there is maybe a user who set a debug parameter 3.
> > The user assume that logs whose levels are less than 4 are shown.
> > However, after the bitmask method is adopted, someday the logs whose
> > level is 1 or 2 are only shown, not 3 level logs are not shown.
> > This will be confusing to users.
> 
> I think I have to agree with Hirokazu here. Even though it's only
> about debugging, there might be some automatic testing systems that
> actually rely on certain values here.

I think it's a non-argument.

If there automated systems that rely on specific levels, then
changing the levels of individual messages could also cause
those automated systems to fail.