linux-kernel - Re: [PATCH] i3c/master/mipi-i3c-hci: Fix position of __maybe_unused in i3c_hci_of

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Date:   Mon, 21 Dec 2020 22:13:02 -0500 (EST)
From:   Nicolas Pitre <npitre@...libre.com>
To:     Nathan Chancellor <natechancellor@...il.com>
cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] i3c/master/mipi-i3c-hci: Fix position of __maybe_unused
 in i3c_hci_of_match

On Mon, 21 Dec 2020, Nathan Chancellor wrote:

> Clang warns:
> 
>  ../drivers/i3c/master/mipi-i3c-hci/core.c:780:21: warning: attribute
>  declaration must precede definition [-Wignored-attributes]
>  static const struct __maybe_unused of_device_id i3c_hci_of_match[] = {
>                      ^
>  ../include/linux/compiler_attributes.h:267:56: note: expanded from macro
>  '__maybe_unused'
>  #define __maybe_unused                  __attribute__((__unused__))
>                                                         ^
>  ../include/linux/mod_devicetable.h:262:8: note: previous definition is
>  here
>  struct of_device_id {
>         ^
> 1 warning generated.
> 
> 'struct of_device_id' should not be split, as it is a type. Move the
> __maybe_unused attribute after the static and const qualifiers so that
> there are no warnings about this variable, period.
> 
> Fixes: 95393f3e07ab ("i3c/master/mipi-i3c-hci: quiet maybe-unused variable warning")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1221
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Acked-by: Nicolas Pitre <npitre@...libre.com>

> ---
>  drivers/i3c/master/mipi-i3c-hci/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c
> index 500abd27fb22..1b73647cc3b1 100644
> --- a/drivers/i3c/master/mipi-i3c-hci/core.c
> +++ b/drivers/i3c/master/mipi-i3c-hci/core.c
> @@ -777,7 +777,7 @@ static int i3c_hci_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static const struct __maybe_unused of_device_id i3c_hci_of_match[] = {
> +static const __maybe_unused struct of_device_id i3c_hci_of_match[] = {
>  	{ .compatible = "mipi-i3c-hci", },
>  	{},
>  };
> 
> base-commit: 95393f3e07ab53855b91881692a4a5b52dcdc03c
> -- 
> 2.30.0.rc1
> 
>