linux-kernel - Re: [PATCH] goldfish: Fix unused const variable 'goldfish_pipe_acpi

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Message-ID: <ttlc5ppgljd3plbk6kw4ndi47pqafivtxk2sosdhlw3zeda273@dn74s3eluxqp>
Date: Fri, 25 Oct 2024 16:27:07 +0200
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: Zeng Heng <zengheng4@...wei.com>
Cc: jia-cheng.hu@...el.com, gregkh@...uxfoundation.org, 
	quic_jjohnson@...cinc.com, jinqian@...roid.com, alan@...ux.intel.com, 
	linux-kernel@...r.kernel.org, bobo.shaobowang@...wei.com, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH] goldfish: Fix unused const variable
 'goldfish_pipe_acpi_match'

Hello,

[Cc += Andy]

On Fri, Oct 25, 2024 at 03:41:29PM +0800, Zeng Heng wrote:
> Fix the following compilation warning:
> 
> drivers/platform/goldfish/goldfish_pipe.c:925:36: warning:
> ‘goldfish_pipe_acpi_match’ defined but not used
> [-Wunused-const-variable=]
>   925 | static const struct acpi_device_id goldfish_pipe_acpi_match[] = {
> 
> Only define the const variable when the CONFIG_ACPI is enabled.

Note you also need CONFIG_MODULE=n to reproduce.

> Fixes: d62f324b0ac8 ("goldfish: Enable ACPI-based enumeration for android pipe")
> Signed-off-by: Zeng Heng <zengheng4@...wei.com>
> ---
>  drivers/platform/goldfish/goldfish_pipe.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
> index c2aab0cfab33..aeabacba3760 100644
> --- a/drivers/platform/goldfish/goldfish_pipe.c
> +++ b/drivers/platform/goldfish/goldfish_pipe.c
> @@ -922,11 +922,13 @@ static void goldfish_pipe_remove(struct platform_device *pdev)
>  	goldfish_pipe_device_deinit(pdev, dev);
>  }
>  
> +#ifdef CONFIG_ACPI
>  static const struct acpi_device_id goldfish_pipe_acpi_match[] = {
>  	{ "GFSH0003", 0 },
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(acpi, goldfish_pipe_acpi_match);
> +#endif
>  
>  static const struct of_device_id goldfish_pipe_of_match[] = {
>  	{ .compatible = "google,android-pipe", },

Looking at changes like
https://lore.kernel.org/all/20241024130424.3818291-11-andriy.shevchenko@linux.intel.com/
I suggest to drop the use of ACPI_PTR() instead.

Best regards
Uwe

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