Re: [Xen-devel] [PATCH 11/11] arm64: use asm-generic/dma-mapping.h

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Mon, 26 Aug 2019, Christoph Hellwig wrote:
> Now that the Xen special cases are gone nothing worth mentioning is
> left in the arm64 <asm/dma-mapping.h> file, so switch to use the
> asm-generic version instead.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> Acked-by: Will Deacon <will@xxxxxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
>  arch/arm64/include/asm/Kbuild        |  1 +
>  arch/arm64/include/asm/dma-mapping.h | 22 ----------------------
>  arch/arm64/mm/dma-mapping.c          |  1 +
>  3 files changed, 2 insertions(+), 22 deletions(-)
>  delete mode 100644 arch/arm64/include/asm/dma-mapping.h
> 
> diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
> index c52e151afab0..98a5405c8558 100644
> --- a/arch/arm64/include/asm/Kbuild
> +++ b/arch/arm64/include/asm/Kbuild
> @@ -4,6 +4,7 @@ generic-y += delay.h
>  generic-y += div64.h
>  generic-y += dma.h
>  generic-y += dma-contiguous.h
> +generic-y += dma-mapping.h
>  generic-y += early_ioremap.h
>  generic-y += emergency-restart.h
>  generic-y += hw_irq.h
> diff --git a/arch/arm64/include/asm/dma-mapping.h 
> b/arch/arm64/include/asm/dma-mapping.h
> deleted file mode 100644
> index 67243255a858..000000000000
> --- a/arch/arm64/include/asm/dma-mapping.h
> +++ /dev/null
> @@ -1,22 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0-only */
> -/*
> - * Copyright (C) 2012 ARM Ltd.
> - */
> -#ifndef __ASM_DMA_MAPPING_H
> -#define __ASM_DMA_MAPPING_H
> -
> -#ifdef __KERNEL__
> -
> -#include <linux/types.h>
> -#include <linux/vmalloc.h>
> -
> -#include <xen/xen.h>
> -#include <asm/xen/hypervisor.h>
> -
> -static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type 
> *bus)
> -{
> -     return NULL;
> -}
> -
> -#endif       /* __KERNEL__ */
> -#endif       /* __ASM_DMA_MAPPING_H */
> diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
> index 4b244a037349..6578abcfbbc7 100644
> --- a/arch/arm64/mm/dma-mapping.c
> +++ b/arch/arm64/mm/dma-mapping.c
> @@ -8,6 +8,7 @@
>  #include <linux/cache.h>
>  #include <linux/dma-noncoherent.h>
>  #include <linux/dma-iommu.h>
> +#include <xen/xen.h>
>  #include <xen/swiotlb-xen.h>
>  
>  #include <asm/cacheflush.h>
> -- 
> 2.20.1
> 

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