linux-kernel - Re: [PATCH] iommu/renesas: fix unused-function warning

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Date:   Tue, 12 May 2020 11:53:29 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Joerg Roedel <joro@...tes.org>, Joerg Roedel <jroedel@...e.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Hai Nguyen Pham <hai.pham.ud@...esas.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/renesas: fix unused-function warning

On Sat, May 09, 2020 at 12:02:16AM +0200, Arnd Bergmann wrote:
> gcc warns because the only reference to ipmmu_find_group
> is inside of an #ifdef:
> 
> drivers/iommu/ipmmu-vmsa.c:878:28: error: 'ipmmu_find_group' defined but not used [-Werror=unused-function]
> 
> Change the #ifdef to an equivalent IS_ENABLED().
> 
> Fixes: 6580c8a78424 ("iommu/renesas: Convert to probe/release_device() call-backs")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Simon Horman <horms@...ge.net.au>

> ---
>  drivers/iommu/ipmmu-vmsa.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> index fb7e702dee23..4c2972f3153b 100644
> --- a/drivers/iommu/ipmmu-vmsa.c
> +++ b/drivers/iommu/ipmmu-vmsa.c
> @@ -903,11 +903,8 @@ static const struct iommu_ops ipmmu_ops = {
>  	.probe_device = ipmmu_probe_device,
>  	.release_device = ipmmu_release_device,
>  	.probe_finalize = ipmmu_probe_finalize,
> -#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
> -	.device_group = generic_device_group,
> -#else
> -	.device_group = ipmmu_find_group,
> -#endif
> +	.device_group = IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA)
> +			? generic_device_group : ipmmu_find_group,
>  	.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
>  	.of_xlate = ipmmu_of_xlate,
>  };
> -- 
> 2.26.0
>