linux-kernel - Re: [PATCH 15/15] mmc: host: sdhci-iproc: Tell the compiler that ACPI functions may not be used

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Message-ID: <3a32b98c-45c6-6f8d-0853-161f91e65b57@broadcom.com>
Date:   Thu, 2 Jul 2020 12:42:40 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Lee Jones <lee.jones@...aro.org>, ulf.hansson@...aro.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH 15/15] mmc: host: sdhci-iproc: Tell the compiler that ACPI
 functions may not be used

Hi Lee,

On 2020-07-01 5:47 a.m., Lee Jones wrote:
> ... as is the case when !CONFIG_ACPI.
>
> Fixes the following W=1 kernel build warning:
>
>   mmc/host/sdhci-iproc.c:297:36: warning: ‘sdhci_iproc_acpi_ids’ defined but not used [-Wunused-const-variable=]
>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Ray Jui <rjui@...adcom.com>
> Cc: Scott Branden <sbranden@...adcom.com>
> Cc: bcm-kernel-feedback-list@...adcom.com
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>   drivers/mmc/host/sdhci-iproc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
> index 225603148d7de..9c7d130205edd 100644
> --- a/drivers/mmc/host/sdhci-iproc.c
> +++ b/drivers/mmc/host/sdhci-iproc.c
> @@ -294,7 +294,7 @@ static const struct of_device_id sdhci_iproc_of_match[] = {
>   };
>   MODULE_DEVICE_TABLE(of, sdhci_iproc_of_match);
>   
Would it better to compile this in if CONFIG_ACPI is defined instead?
#if CONFIG_ACPI
> -static const struct acpi_device_id sdhci_iproc_acpi_ids[] = {
> +static const struct acpi_device_id __maybe_unused sdhci_iproc_acpi_ids[] = {
>   	{ .id = "BRCM5871", .driver_data = (kernel_ulong_t)&iproc_cygnus_data },
>   	{ .id = "BRCM5872", .driver_data = (kernel_ulong_t)&iproc_data },
>   	{ /* sentinel */ }