linux-kernel - Re: [PATCH] media: tua6100: Remove some ugly defines

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Message-ID: <20190612120122.GA2805@kunai>
Date:   Wed, 12 Jun 2019 14:01:22 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...radead.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ruslan Babayev <ruslan@...ayev.com>,
        Andrew de Quincey <adq_dvb@...skialf.net>,
        Michael Buesch <m@...s.ch>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] media: tua6100: Remove some ugly defines

On Wed, Jun 12, 2019 at 08:25:03AM -0300, Mauro Carvalho Chehab wrote:
> As reported by Stephen:
> 
> > After merging the i2c tree, today's linux-next build (x86_64 allmodconfig)
> > produced this warning:
> >
> > drivers/media/dvb-frontends/tua6100.c: In function 'tua6100_set_params':
> > drivers/media/dvb-frontends/tua6100.c:71: warning: "_P" redefined
> >  #define _P 32
> >
> > In file included from include/acpi/platform/aclinux.h:54,
> >                  from include/acpi/platform/acenv.h:152,
> >                  from include/acpi/acpi.h:22,
> >                  from include/linux/acpi.h:21,
> >                  from include/linux/i2c.h:17,
> >                  from drivers/media/dvb-frontends/tua6100.h:22,
> >                  from drivers/media/dvb-frontends/tua6100.c:24:
> > include/linux/ctype.h:14: note: this is the location of the previous definition
> >  #define _P 0x10 /* punct */
> >
> > Exposed by commit
> >
> >   5213d7efc8ec ("i2c: acpi: export i2c_acpi_find_adapter_by_handle")
> >
> > Since that included <linux/acpi.h> from <linux/i2c.h>
> >
> > Originally introduced by commit
> >
> >   00be2e7c6415 ("V4L/DVB (4606): Add driver for TUA6100")
> >
> > The _P in <linux/ctype.h> has existed since before git.
> 
> The addition of include <linux/ctype.h> at the I2C code caused a
> breakage at the tua6100 driver. The reason is that the code there
> used defines for 3 parameters used at the calculus for the
> divide ratio.
> 
> In thesis, those are board-dependent, but, as there's just one
> driver using it (ttpci/budget-av), there was no need to make
> the code more generic. While it sounds unlikely that this old
> DVB-S frontend would ever be used on new projects, one might
> some day come with a variant using a different configuration. So,
> let's do the right thing and store those values at its private
> struct.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>

Acked-by: Wolfram Sang <wsa@...-dreams.de>


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