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

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Date:   Thu, 2 Jul 2020 21:13:48 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Scott Branden <scott.branden@...adcom.com>
Cc:     ulf.hansson@...aro.org, 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

On Thu, 02 Jul 2020, Scott Branden wrote:

> 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

Literally can't win.

 https://lore.kernel.org/linux-arm-kernel/CAGb2v66Ws4WNPZbOYQvikKoozj_2WjzS-Jq-o2VxT77=k0vODw@mail.gmail.com/

Damned if we do, damned if we don't. ;)

> > -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 */ }
> 

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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