linux-kernel - Re: [PATCH] m68k: don't select ARCH_HAS_DMA_PREP

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Message-ID: <CAMuHMdVrAVYWvQCh7AF1O7SRbuZb9fQp9fi0yQyZMeaOpfHyEw@mail.gmail.com>
Date:   Mon, 8 Jul 2019 22:39:48 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Ungerer <gerg@...ux-m68k.org>
Subject: Re: [PATCH] m68k: don't select ARCH_HAS_DMA_PREP_COHERENT for nommu
 or coldfire

Hi Christoph,

On Mon, Jul 8, 2019 at 7:51 PM Christoph Hellwig <hch@....de> wrote:
>
> m68k only provides the dma_prep_coherent symbol when an mmu is enabled

arch_dma_prep_coherent

> and not on the coldfire platform.  Fix the Kconfig symbol selection
> up to match this.
>
> Fixes: 69878ef47562 ("m68k: Implement arch_dma_prep_coherent()")

Do you know the SHA1 for the other commit, that causes the issue when
combined with the above?

> Reported-by: Guenter Roeck <linux@...ck-us.net>

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

> --- a/arch/m68k/Kconfig
> +++ b/arch/m68k/Kconfig
> @@ -5,7 +5,7 @@ config M68K
>         select ARCH_32BIT_OFF_T
>         select ARCH_HAS_BINFMT_FLAT
>         select ARCH_HAS_DMA_MMAP_PGPROT if MMU && !COLDFIRE
> -       select ARCH_HAS_DMA_PREP_COHERENT
> +       select ARCH_HAS_DMA_PREP_COHERENT if HAS_DMA && MMU && !COLDFIRE
>         select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA
>         select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
>         select ARCH_NO_COHERENT_DMA_MMAP if !MMU

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