linux-kernel - Re: [PATCH] media: rkvdec: silence ktest bot build warning

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Date:   Thu, 07 Jan 2021 09:32:28 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>,
        Hans Verkuil <hverkuil@...all.nl>
Cc:     Adrian Ratiu <adrian.ratiu@...labora.com>,
        linux-media@...r.kernel.org, kernel@...labora.com,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] media: rkvdec: silence ktest bot build warning

On Thu, 2021-01-07 at 12:41 +0100, Boris Brezillon wrote:
> On Thu, 7 Jan 2021 10:13:43 +0100
> Hans Verkuil <hverkuil@...all.nl> wrote:
> 
> > On 08/12/2020 16:55, Adrian Ratiu wrote:
> > > Some configurations built by the ktest bot produce the following
> > > warn, so mark the struct as __maybe_unused to avoid unnecessary
> > > ML spam.
> > >   
> > > > > drivers/staging/media/rkvdec/rkvdec.c:967:34: warning: unused variable 'of_rkvdec_match' [-Wunused-const-variable]  
> > >    static const struct of_device_id of_rkvdec_match[] = {
> > >                                     ^
> > >    1 warning generated.  
> > 
> > I suspect that this is because there is no 'depends on OF' in the Kconfig.
> > 
> > '__maybe_unused' isn't used for this anywhere else, so this does not seem like the
> > right approach.
> 
> It's not uncommon to do that, especially when you want the driver to be
> compile-tested (`git grep -C2 __maybe_unused|grep of_device_id` even
> reports 2 drivers in the media tree :P). A `depends on OF` or an
> `#ifdef CONFIG_OF` section surrounding the of_rkvdec_match declaration
> would also do the trick.
> 

I'm fine either way, __maybe_unused or depends on OF.

Thanks,
Ezequiel