[PATCH 2/3] iommu/dma: Move public interfaces to linux/iommu.h

[Christoph Hellwig]

> 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.