linux-kernel - Re: linux-next: manual merge of the xen-tip tree with the tree

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Date:	Wed, 30 Oct 2013 17:34:28 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Xen Devel <Xen-devel@...ts.xensource.com>,
	<linux-next@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Russell King <rmk@....linux.org.uk>,
	Santosh Shilimkar <santosh.shilimkar@...com>
Subject: Re: linux-next: manual merge of the xen-tip tree with the  tree

Looks fine thanks!
Just an heads up: I'll be updating the Xen code below soon so this
conflict might come up again.

On Wed, 30 Oct 2013, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the xen-tip tree got a conflict in
> arch/arm/include/asm/dma-mapping.h between commit 223016339ce7 ("ARM:
> 7805/1: mm: change max*pfn to include the physical offset of memory")
> from the arm tree and commit 06e6295bcece ("arm: make SWIOTLB available")
> from the xen-tip tree.
> 
> I fixed it up (see below) and can carry the fix as necessary (no action
> is required).
> 
> -- 
> Cheers,
> Stephen Rothwell                    sfr@...b.auug.org.au
> 
> diff --cc arch/arm/include/asm/dma-mapping.h
> index 863cd84eb1a2,f5945d4e4e9f..000000000000
> --- a/arch/arm/include/asm/dma-mapping.h
> +++ b/arch/arm/include/asm/dma-mapping.h
> @@@ -87,13 -98,42 +99,49 @@@ static inline dma_addr_t virt_to_dma(st
>   }
>   #endif
>   
>  +/* The ARM override for dma_max_pfn() */
>  +static inline unsigned long dma_max_pfn(struct device *dev)
>  +{
>  +	return PHYS_PFN_OFFSET + dma_to_pfn(dev, *dev->dma_mask);
>  +}
>  +#define dma_max_pfn(dev) dma_max_pfn(dev)
>  +
> + static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
> + {
> + 	unsigned int offset = paddr & ~PAGE_MASK;
> + 	return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
> + }
> + 
> + static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
> + {
> + 	unsigned int offset = dev_addr & ~PAGE_MASK;
> + 	return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
> + }
> + 
> + static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
> + {
> + 	u64 limit, mask;
> + 	
> + 	if (dev->dma_mask)
> + 		mask = *dev->dma_mask;
> + 	else 
> + 		mask = dev->coherent_dma_mask;
> + 
> + 	if (mask == 0)
> + 		return 0;
> + 
> + 	limit = (mask + 1) & ~mask;
> + 	if (limit && size > limit)
> + 		return 0;
> + 
> + 	if ((addr | (addr + size - 1)) & ~mask)
> + 		return 0;
> + 
> + 	return 1;
> + }
> + 
> + static inline void dma_mark_clean(void *addr, size_t size) { }
> + 
>   /*
>    * DMA errors are defined by all-bits-set in the DMA address.
>    */
> 
--
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