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Date:   Mon, 22 Aug 2022 04:21:06 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Robin Murphy <robin.murphy@arm.com>
Cc:     joro@8bytes.org, will@kernel.org, catalin.marinas@arm.com,
        jean-philippe@linaro.org, inki.dae@samsung.com,
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        cohuck@redhat.com, iommu@lists.linux.dev,
        linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org,
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Subject: Re: [PATCH 2/3] iommu/dma: Move public interfaces to linux/iommu.h
Message-ID: <YwNmosMGZdGtY3LX@infradead.org>
References: <cover.1660668998.git.robin.murphy@arm.com>
 <9cd99738f52094e6bed44bfee03fa4f288d20695.1660668998.git.robin.murphy@arm.com>
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> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 70393fbb57ed..79cb6eb560a8 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -1059,4 +1059,40 @@ void iommu_debugfs_setup(void);
>  static inline void iommu_debugfs_setup(void) {}
>  #endif
>  
> +#ifdef CONFIG_IOMMU_DMA
> +#include <linux/msi.h>

I don't think msi.h is actually needed here.

Just make the struct msi_desc and struct msi_msg forward declarations
unconditional and we should be fine.