linux-kernel - Re: [PATCH 01/15] iommu: Define dev_iommu_fwspec_get() for !CONFIG_IOMMU

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Date:   Mon, 16 Mar 2020 16:39:16 +0100
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 01/15] iommu: Define dev_iommu_fwspec_get() for
 !CONFIG_IOMMU_API

On Tue, Mar 10, 2020 at 10:12:15AM +0100, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
> 
> There are users outside of the IOMMU code that need to call that
> function. Define it for !CONFIG_IOMMU_API too so that compilation does
> not break.
> 
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Joerg Roedel <jroedel@...e.de>

Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>

As a result drivers/gpu/host1x/hw/channel_hw.c and
drivers/gpu/drm/tegra/vic.c can lose their #ifdef CONFIG_IOMMU_API

> ---
>  include/linux/iommu.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index d1b5f4d98569..3c4ca041d7a2 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -1073,6 +1073,10 @@ static inline int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
>  	return -ENODEV;
>  }
>  
> +static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
> +{
> +	return NULL;
> +}
>  #endif /* CONFIG_IOMMU_API */
>  
>  #ifdef CONFIG_IOMMU_DEBUGFS
> -- 
> 2.17.1
>