Re: [PATCH 4/6] dma-mapping: remove arch_dma_mmap_pgprot

[Geert Uytterhoeven]

On Fri, Aug 16, 2019 at 9:19 AM Christoph Hellwig <hch@xxxxxx> 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@xxxxxx>

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

Acked-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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