linux-kernel - Re: [PATCH 4/6] dma-mapping: remove arch_dma_mmap

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Message-ID: <CAMuHMdVk3LZk3Ro3PYn9aOZ6NRUr5AOp+NwSNiaq2hBTS0-BtQ@mail.gmail.com>
Date:   Fri, 16 Aug 2019 09:43:40 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Linux IOMMU <iommu@...ts.linux-foundation.org>,
        Shawn Anastasio <shawn@...stas.io>,
        Will Deacon <will@...nel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Guan Xuetao <gxt@....edu.cn>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        linux-mips@...r.kernel.org, Paul Burton <paul.burton@...s.com>,
        Catalin Marinas <catalin.marinas@....com>,
        James Hogan <jhogan@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/6] dma-mapping: remove arch_dma_mmap_pgprot

On Fri, Aug 16, 2019 at 9:19 AM Christoph Hellwig <hch@....de> wrote:
> arch_dma_mmap_pgprot is used for two things:
>
>  1) to override the "normal" uncached page attributes for mapping
>     memory coherent to devices that can't snoop the CPU caches
>  2) to provide the special DMA_ATTR_WRITE_COMBINE semantics on older
>     arm systems
>
> Replace one with the pgprot_dmacoherent macro that is already provided
> by arm and much simpler to use, and lift the DMA_ATTR_WRITE_COMBINE
> handling to common code with an explicit arch opt-in.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

>  arch/m68k/Kconfig                  |  1 -
>  arch/m68k/include/asm/pgtable_mm.h |  3 +++
>  arch/m68k/kernel/dma.c             |  3 +--

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