linux-kernel - Re: [PATCH v2 1/1] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

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Message-ID: <2751400ae13b25d8259a8a9d7b36caf98ec2d367.camel@perches.com>
Date:   Fri, 03 Apr 2020 10:48:04 -0700
From:   Joe Perches <joe@...ches.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-media@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        hverkuil@...all.nl, laurent.pinchart@...asonboard.com,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>
Subject: Re: [PATCH v2 1/1] lib/vsprintf: Add support for printing V4L2 and
 DRM fourccs

On Fri, 2020-04-03 at 19:32 +0200, Mauro Carvalho Chehab wrote:
> Em Fri, 03 Apr 2020 09:56:42 -0700
> Joe Perches <joe@...ches.com> escreveu:
[]
> > How many instances of %p4cc could there be?
> 
> That's hard to know... there are several places printing it
> with different ways:
> 
> 	$ git grep -i -E "(dev|pr)_(warn|dbg|info)" drivers/media|grep pixf|wc -l
> 	6
> 	$ git grep -i -E "print" drivers/media|grep pixf|wc -l
> 	1
> 	$ git grep print_fourcc|wc -l
> 	7
> 	$ git grep -i -E "(dev|pr)_(warn|dbg|info)" drivers/media|grep pixelf|wc -l
> 	10
> 	$ git grep -i -E "(dev|pr|v4l)_(warn|dbg|info)" drivers/media|grep format|wc -l
> 	60
> 
> I bet there are other places besides the above ones, but the thing is, as 
> we currently lack a standard way, drivers still have their own ideas
> about how to handle it. Each one does it differently.

My thought was ~100 uses was a minimum, rather like %pI6c.

That's pretty close already, so I suppose that's enough.

It _might_ be useful to use a CONFIG_MEDIA_SUPPORT guard
in lib/vsprintf for this.

cheers, Joe