linux-kernel - Re: [PATCH] [STABLE-4.4, 3.18]: fix xen_swiotlb_dma

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Date:   Wed, 4 Oct 2017 10:01:26 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
cc:     gregkh@...uxfoundation.org, stable@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org, jgross@...e.com, krzk@...nel.org,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        David Vrabel <david.vrabel@...rix.com>,
        Stefano Stabellini <stefano.stabellini@...citrix.com>,
        Andrii Anisov <andrii_anisov@...m.com>,
        Oleksandr Dmytryshyn <oleksandr.dmytryshyn@...ballogic.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [STABLE-4.4, 3.18]: fix xen_swiotlb_dma_mmap prototype

On Wed, 4 Oct 2017, Arnd Bergmann wrote:
> xen_swiotlb_dma_mmap was backported from v4.10, but older
> kernels before commit 00085f1efa38 ("dma-mapping: use unsigned long
> for dma_attrs") use a different signature:
> 
> arm/xen/mm.c:202:10: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
>   .mmap = xen_swiotlb_dma_mmap,
>           ^~~~~~~~~~~~~~~~~~~~
> arm/xen/mm.c:202:10: note: (near initialization for 'xen_swiotlb_dma_ops.mmap')
> 
> This adapts the patch to the old calling conventions.
> 
> Fixes: 2f0b82b1b830 ("swiotlb-xen: implement xen_swiotlb_dma_mmap callback")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Stefano Stabellini <sstabellini@...nel.org>


> ---
>  drivers/xen/swiotlb-xen.c | 2 +-
>  include/xen/swiotlb-xen.h | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index 622f805fb382..f7b19c25c3a4 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -689,7 +689,7 @@ EXPORT_SYMBOL_GPL(xen_swiotlb_set_dma_mask);
>  int
>  xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
>  		     void *cpu_addr, dma_addr_t dma_addr, size_t size,
> -		     unsigned long attrs)
> +		     struct dma_attrs *attrs)
>  {
>  #if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
>  	if (__generic_dma_ops(dev)->mmap)
> diff --git a/include/xen/swiotlb-xen.h b/include/xen/swiotlb-xen.h
> index fab4fb9c6442..4d7fdbf20eff 100644
> --- a/include/xen/swiotlb-xen.h
> +++ b/include/xen/swiotlb-xen.h
> @@ -62,5 +62,5 @@ xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask);
>  extern int
>  xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
>  		     void *cpu_addr, dma_addr_t dma_addr, size_t size,
> -		     unsigned long attrs);
> +		     struct dma_attrs *attrs);
>  #endif /* __LINUX_SWIOTLB_XEN_H */
> -- 
> 2.9.0
>