linux-kernel - Re: [PATCH] MIPS: launch.h: add include guard to prevent build errors

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Date:   Sat, 22 May 2021 11:24:50 -0700
From:   Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH] MIPS: launch.h: add include guard to prevent build errors

On Thu, May 20, 2021 at 10:13 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> arch/mips/include/asm/mips-boards/launch.h needs an include guard
> to prevent it from being #included more than once.
> Prevents these build errors:
>
> In file included from ../arch/mips/mti-malta/malta-amon.c:16:
> ../arch/mips/include/asm/mips-boards/launch.h:8:8: error: redefinition of 'struct cpulaunch'
>     8 | struct cpulaunch {
>       |        ^~~~~~~~~
> In file included from ../arch/mips/include/asm/mips-cps.h:13,
>                  from ../arch/mips/include/asm/smp-ops.h:16,
>                  from ../arch/mips/include/asm/smp.h:21,
>                  from ../include/linux/smp.h:114,
>                  from ../arch/mips/mti-malta/malta-amon.c:12:
> ../arch/mips/include/asm/mips-boards/launch.h:8:8: note: originally defined here
>     8 | struct cpulaunch {
>       |        ^~~~~~~~~
> make[3]: [../scripts/Makefile.build:273: arch/mips/mti-malta/malta-amon.o] Error 1 (ignored)
>
> Fixes: 6decd1aad15f ("MIPS: add support for buggy MT7621S core detection")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Reported-by: kernel test robot <lkp@...el.com>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: linux-mips@...r.kernel.org
> Cc: Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
> ---
>  arch/mips/include/asm/mips-boards/launch.h |    5 +++++
>  1 file changed, 5 insertions(+)
>
> --- linux-next-20210520.orig/arch/mips/include/asm/mips-boards/launch.h
> +++ linux-next-20210520/arch/mips/include/asm/mips-boards/launch.h
> @@ -3,6 +3,9 @@
>   *
>   */
>
> +#ifndef _ASM_MIPS_BOARDS_LAUNCH_H
> +#define _ASM_MIPS_BOARDS_LAUNCH_H
> +
>  #ifndef _ASSEMBLER_
>
>  struct cpulaunch {
> @@ -34,3 +37,5 @@ struct cpulaunch {
>
>  /* Polling period in count cycles for secondary CPU's */
>  #define LAUNCHPERIOD   10000
> +
> +#endif /* _ASM_MIPS_BOARDS_LAUNCH_H */
Thank you for fixing this.

Reviewed-by: Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>