linux-kernel - Re: [PATCH 2/2] x86: Hide the archdata.iommu field behind generic IOMMU

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Date:   Wed, 27 May 2020 16:30:46 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 2/2] x86: Hide the archdata.iommu field behind generic
 IOMMU_API

On Mon, May 18, 2020 at 02:08:55PM +0200, Krzysztof Kozlowski wrote:
> There is a generic, kernel wide configuration symbol for enabling the
> IOMMU specific bits: CONFIG_IOMMU_API.  Implementations (including
> INTEL_IOMMU and AMD_IOMMU driver) select it so use it here as well.
> 
> This makes the conditional archdata.iommu field consistent with other
> platforms and also fixes any compile test builds of other IOMMU drivers,
> when INTEL_IOMMU or AMD_IOMMU are not selected).
> 
> For the case when INTEL_IOMMU/AMD_IOMMU and COMPILE_TEST are not
> selected, this should create functionally equivalent code/choice.  With
> COMPILE_TEST this field could appear if other IOMMU drivers are chosen
> but neither INTEL_IOMMU nor AMD_IOMMU are not.
> 
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  arch/x86/include/asm/device.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/include/asm/device.h b/arch/x86/include/asm/device.h
> index 7e31f7f1bb06..49bd6cf3eec9 100644
> --- a/arch/x86/include/asm/device.h
> +++ b/arch/x86/include/asm/device.h
> @@ -3,7 +3,7 @@
>  #define _ASM_X86_DEVICE_H
>  
>  struct dev_archdata {
> -#if defined(CONFIG_INTEL_IOMMU) || defined(CONFIG_AMD_IOMMU)
> +#ifdef CONFIG_IOMMU_API
>  	void *iommu; /* hook for IOMMU specific extension */
>  #endif
>  };

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette