linux-kernel - Re: [PATCH] drm/rockchip: defined struct rockchip_dp_dt_ids[] under CONFIG

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Message-ID: <8027801c-5260-8b1b-c758-fdfb8c18e9a7@arm.com>
Date:   Wed, 2 Jun 2021 11:07:06 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Souptick Joarder <jrdr.linux@...il.com>, hjc@...k-chips.com,
        heiko@...ech.de, airlied@...ux.ie, daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] drm/rockchip: defined struct rockchip_dp_dt_ids[] under
 CONFIG_OF

On 2021-06-02 09:02, Souptick Joarder wrote:
> Kernel test robot throws below warning when CONFIG_OF
> is not set.
> 
>>> drivers/gpu/drm/rockchip/analogix_dp-rockchip.c:457:34:
> warning: unused variable 'rockchip_dp_dt_ids' [-Wunused-const-variable]
>     static const struct of_device_id rockchip_dp_dt_ids[] = {
> 
> Fixed it by defining rockchip_dp_dt_ids[] under CONFIG_OF.

I think the __maybe_unused annotation is generally preferred over 
#ifdefs these days. However, since these drivers only work with 
devicetree anyway, it probably makes more sense to just remove the 
of_match_ptr() uses which lead to these warnings in the first place.

Robin.

> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> ---
>   drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index ade2327a10e2..9b79ebaeae97 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -454,12 +454,14 @@ static const struct rockchip_dp_chip_data rk3288_dp = {
>   	.chip_type = RK3288_DP,
>   };
>   
> +#ifdef CONFIG_OF
>   static const struct of_device_id rockchip_dp_dt_ids[] = {
>   	{.compatible = "rockchip,rk3288-dp", .data = &rk3288_dp },
>   	{.compatible = "rockchip,rk3399-edp", .data = &rk3399_edp },
>   	{}
>   };
>   MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
> +#endif
>   
>   struct platform_driver rockchip_dp_driver = {
>   	.probe = rockchip_dp_probe,
>