linux-kernel - Re: [PATCH] serial: extend compile-test coverage

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Date:   Thu, 22 Apr 2021 09:11:50 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kbuild-all@...ts.01.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] serial: extend compile-test coverage

On Thu, Apr 22, 2021 at 3:20 AM kernel test robot <lkp@...el.com> wrote:
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on tty/tty-testing]
> [also build test WARNING on usb/usb-testing v5.12-rc8 next-20210421]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url:    https://github.com/0day-ci/linux/commits/Johan-Hovold/serial-extend-compile-test-coverage/20210421-234950
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
> config: x86_64-randconfig-a014-20210421 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d87b9b81ccb95217181ce75515c6c68bbb408ca4)
> 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
>         # install x86_64 cross compiling tool for clang build
>         # apt-get install binutils-x86-64-linux-gnu
>         # https://github.com/0day-ci/linux/commit/c010530fa587261662c6abdb59ade994645dcfa8
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Johan-Hovold/serial-extend-compile-test-coverage/20210421-234950
>         git checkout c010530fa587261662c6abdb59ade994645dcfa8
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/tty/serial/serial_txx9.c:987:12: warning: no previous prototype for function 'early_serial_txx9_setup' [-Wmissing-prototypes]
>    int __init early_serial_txx9_setup(struct uart_port *port)
>               ^
>    drivers/tty/serial/serial_txx9.c:987:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>    int __init early_serial_txx9_setup(struct uart_port *port)
>    ^
>    static
>    1 warning generated.

This function is called from arch/mips/txx9/generic/setup.c, and does
have a forward declaration in arch/mips/include/asm/txx9/generic.h.
Unfortunately the latter cannot be included from the driver, unless
the || COMPILE_TEST is dropped again.

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