linux-kernel - Re: [PATCH 1/2] MIPS: Allow including mach-generic/dma-coherence.h

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Date:   Tue, 13 Mar 2018 17:24:02 +0000
From:   James Hogan <jhogan@...nel.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-mips@...ux-mips.org, david.daney@...ium.com,
        paul.burton@...s.com, Ralf Baechle <ralf@...ux-mips.org>,
        Kevin Cernekee <cernekee@...il.com>,
        Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Doug Ledford <dledford@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] MIPS: Allow including mach-generic/dma-coherence.h

On Tue, Jan 23, 2018 at 05:40:09PM -0800, Florian Fainelli wrote:
> @@ -71,15 +83,19 @@ static inline void plat_post_dma_flush(struct device *dev)
>  #endif
>  
>  #ifdef CONFIG_SWIOTLB
> +#ifndef phys_to_dma
>  static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
>  {
>  	return paddr;
>  }
> +#endif
>  
> +#ifndef dma_to_phys
>  static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
>  {
>  	return daddr;
>  }
>  #endif
> +#endif /* CONFIG_SWIOTLB */

FYI these were removed in commit ea8c64ace866 ("dma-mapping: move
swiotlb arch helpers to a new header"), and are only implemented by
platforms which select ARCH_HAS_PHYS_TO_DMA.

Cheers
James

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