linux-kernel - Re: [PATCH] iommu/of: mark an unused function as __maybe

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Message-ID: <Y+TO0yEdUNzWUUrA@orome>
Date:   Thu, 9 Feb 2023 11:45:39 +0100
From:   Thierry Reding <treding@...dia.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
        Will Deacon <will@...nel.org>, iommu@...ts.linux.dev
Subject: Re: [PATCH] iommu/of: mark an unused function as __maybe_unused

On Wed, Feb 08, 2023 at 05:03:59PM -0800, Randy Dunlap wrote:
> When CONFIG_OF_ADDRESS is not set, there is a build warning/error
> about an unused function.
> Annotate the function to quieten the warning/error.
> 
> ../drivers/iommu/of_iommu.c:176:29: warning: 'iommu_resv_region_get_type' defined but not used [-Wunused-function]
>   176 | static enum iommu_resv_type iommu_resv_region_get_type(struct device *dev, struct resource *phys,
>       |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Fixes: a5bf3cfce8cb ("iommu: Implement of_iommu_get_resv_regions()")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Thierry Reding <treding@...dia.com>
> Cc: Joerg Roedel <jroedel@...e.de>
> Cc: Will Deacon <will@...nel.org>
> Cc: iommu@...ts.linux.dev
> ---
>  drivers/iommu/of_iommu.c |    5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff -- a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
> --- a/drivers/iommu/of_iommu.c
> +++ b/drivers/iommu/of_iommu.c
> @@ -173,8 +173,9 @@ const struct iommu_ops *of_iommu_configu
>  	return ops;
>  }
>  
> -static enum iommu_resv_type iommu_resv_region_get_type(struct device *dev, struct resource *phys,
> -						       phys_addr_t start, size_t length)
> +static enum iommu_resv_type __maybe_unused iommu_resv_region_get_type(struct device *dev,
> +						struct resource *phys,
> +						phys_addr_t start, size_t length)

Maybe this is one of those cases where we should wrap after the return
type/attributes to keep this somewhat readable?

Either way:

Reviewed-by: Thierry Reding <treding@...dia.com>

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