linux-kernel - Re: [PATCH 8/8] dma-mapping: remove CONFIG_ARCH_NO_COHERENT_DMA

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Date:   Fri, 9 Aug 2019 09:21:28 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Linux IOMMU <iommu@...ts.linux-foundation.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Takashi Iwai <tiwai@...e.de>, Helge Deller <deller@....de>,
        Robin Murphy <robin.murphy@....com>,
        Michal Simek <monstr@...str.eu>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        linux-xtensa@...ux-xtensa.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/8] dma-mapping: remove CONFIG_ARCH_NO_COHERENT_DMA_MMAP

Hi Christoph,

On Thu, Aug 8, 2019 at 6:01 PM Christoph Hellwig <hch@....de> wrote:
> CONFIG_ARCH_NO_COHERENT_DMA_MMAP is now functionally identical to
> !CONFIG_MMU, so remove the separate symbol.  The only difference is that
> arm did not set it for !CONFIG_MMU, but arm uses a separate dma mapping
> implementation including its own mmap method, which is handled by moving
> the CONFIG_MMU check in dma_can_mmap so that is only applies to the
> dma-direct case, just as the other ifdefs for it.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

>  arch/m68k/Kconfig       |  1 -

For m68k:
Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds