linux-kernel - Re: drivers/iio/adc/xilinx-ams.c:1195:21: error: unused variable 'ams'

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Date:   Tue, 15 Feb 2022 09:53:01 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     kernel test robot <lkp@...el.com>,
        Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Manish Narani <manish.narani@...inx.com>,
        linux-sh@...r.kernel.org
Subject: Re: drivers/iio/adc/xilinx-ams.c:1195:21: error: unused variable 'ams'

On Tue, Feb 15, 2022 at 9:33 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> On Mon, Feb 14, 2022 at 8:17 PM Jonathan Cameron
> <Jonathan.Cameron@...wei.com> wrote:
> > On Mon, 14 Feb 2022 22:47:14 +0800
> > kernel test robot <lkp@...el.com> wrote:
> >
> > > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > head:   754e0b0e35608ed5206d6a67a791563c631cec07
> > > commit: d5c70627a79455154f5f636096abe6fe57510605 iio: adc: Add Xilinx AMS driver
> > > date:   8 weeks ago
> > > config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220214/202202142203.4ofqbic9-lkp@intel.com/config)
> > > compiler: sh4-linux-gcc (GCC) 11.2.0
> > > reproduce (this is a W=1 build):
> > >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> > >         chmod +x ~/bin/make.cross
> > >         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d5c70627a79455154f5f636096abe6fe57510605
> > >         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > >         git fetch --no-tags linus master
> > >         git checkout d5c70627a79455154f5f636096abe6fe57510605
> > >         # save the config file to linux build tree
> > >         mkdir build_dir
> > >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sh SHELL=/bin/bash drivers/iio/adc/ drivers/net/ethernet/freescale/
> > >
> > > If you fix the issue, kindly add following tag as appropriate
> > > Reported-by: kernel test robot <lkp@...el.com>
> >
> > I'm very tempted to say won't fix on this at least not in the IIO code.
> >
> > The issue I think is the stub for iounmap on sh with no MMU not using the argument because it's
>
> Indeed.
>
> > defined as a while loop rather than as an empty static inline function which is what we'd
> > get it it wasn't defined at all (AFAICT).
>
> We would get that only if <asm-generic/io.h> would be included...
>
> > If anyone wants to take this on, my guess is drop
> > https://elixir.bootlin.com/linux/latest/source/arch/sh/include/asm/io.h#L274
> > and see if everything still works and the warning goes away.
>
> Nope:
>
>     error: implicit declaration of function ‘iounmap’
>
> > +CC linux-sh for inputs.
>
> Thanks, I'll post a fix.

https://lore.kernel.org/r/4ed0a7a0d3fa912a5b44c451884818f2c138ef42.1644914600.git.geert+renesas@glider.be/

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds