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Date:   Mon, 8 Jul 2019 21:13:02 +0200
From:   Geert Uytterhoeven <>
To:     Guenter Roeck <>
Cc:     Christoph Hellwig <>,
        Linux Kernel Mailing List <>,
        Stephen Rothwell <>,
        linux-m68k <>
Subject: Re: m68k build failures in -next: undefined reference to `arch_dma_prep_coherent'

Hi G√ľnter,

On Mon, Jul 8, 2019 at 7:06 PM Guenter Roeck <> wrote:
> I see the following build error in -next:
> kernel/dma/direct.o: In function `dma_direct_alloc_pages':
> direct.c:(.text+0x4d8): undefined reference to `arch_dma_prep_coherent'
> Example: m68k:allnoconfig.
> Bisect log is ambiguous and points to the merge of m68k/for-next into
> -next. Yet, I think the problem is with commit 69878ef47562 ("m68k:
> Implement arch_dma_prep_coherent()") which is supposed to introduce
> the function. The problem is likely that arch_dma_prep_coherent()
> is only declared if CONFIG_MMU is enabled, but it is called from code
> outside CONFIG_MMU.

Thanks, one more thing to fix in m68k-allnoconfig (did it really build

Given you say "example", does it fail in real configs, too?

Thanks again!



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

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

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