linux-kernel - Re: [PATCH 6/7] ARM: use the common dma_to_phys/phys_to

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Message-ID: <CAK8P3a3BD5zLiXf=Wr0kcJp-k3+vmhBkEP5DNRw_-H=OX9CoGA@mail.gmail.com>
Date:   Thu, 21 Apr 2022 10:05:11 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Russell King <linux@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andre Przywara <andre.przywara@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 6/7] ARM: use the common dma_to_phys/phys_to_dma
 implementation where possible

On Thu, Apr 21, 2022 at 9:42 AM Christoph Hellwig <hch@....de> wrote:
>
> Only the footbridge platforms provide their own DMA address translation
> helpers, so switch to the generic version for all other platforms, and
> consolidate the footbridge implementation to remove two levels of
> indirection.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

Reviewed-by: Arnd Bergmann <arnd@...db.de>

> ---
> @@ -335,17 +336,19 @@ unsigned long __bus_to_virt(unsigned long res)
>         return res;
>  }
>  EXPORT_SYMBOL(__bus_to_virt);
> -
> -unsigned long __pfn_to_bus(unsigned long pfn)
> +#else
> +static inline unsigned long fb_bus_sdram_offset(void)
>  {
> -       return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET);
> +       return BUS_OFFSET;
>  }
> -EXPORT_SYMBOL(__pfn_to_bus);
> +#endif /* CONFIG_FOOTBRIDGE_ADDIN */

I have an older patch to remove CONFIG_FOOTBRIDGE_ADDIN
completely, as it does a couple of other nasty things and there are
apparently no users. Would that help here?

       Arnd