linux-kernel - Re: [PATCH] kcsan: fix debugfs initcall return type

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Date:   Fri, 14 May 2021 16:10:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Marco Elver <elver@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] kcsan: fix debugfs initcall return type

On Fri, May 14, 2021 at 04:00:08PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> clang points out that an initcall funciton should return an 'int':
> 
> kernel/kcsan/debugfs.c:274:15: error: returning 'void' from a function with incompatible result type 'int'
> late_initcall(kcsan_debugfs_init);
> ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
> include/linux/init.h:292:46: note: expanded from macro 'late_initcall'
>  #define late_initcall(fn)               __define_initcall(fn, 7)
> 
> Fixes: e36299efe7d7 ("kcsan, debugfs: Move debugfs file creation out of early init")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  kernel/kcsan/debugfs.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/kcsan/debugfs.c b/kernel/kcsan/debugfs.c
> index c1dd02f3be8b..e65de172ccf7 100644
> --- a/kernel/kcsan/debugfs.c
> +++ b/kernel/kcsan/debugfs.c
> @@ -266,9 +266,10 @@ static const struct file_operations debugfs_ops =
>  	.release = single_release
>  };
>  
> -static void __init kcsan_debugfs_init(void)
> +static int __init kcsan_debugfs_init(void)
>  {
>  	debugfs_create_file("kcsan", 0644, NULL, NULL, &debugfs_ops);
> +	return 0;
>  }
>  
>  late_initcall(kcsan_debugfs_init);
> -- 
> 2.29.2
> 
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>