linux-kernel - Re: m68k build failures in -next: undefined reference to `arch_dma_prep

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Date:   Mon, 8 Jul 2019 22:38:37 +0200
From:   Christoph Hellwig <hch@....de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Christoph Hellwig <hch@....de>, Guenter Roeck <linux@...ck-us.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>
Subject: Re: m68k build failures in -next: undefined reference to
 `arch_dma_prep_coherent'

On Mon, Jul 08, 2019 at 10:37:33PM +0200, Christoph Hellwig wrote:
> On Mon, Jul 08, 2019 at 10:36:05PM +0200, Geert Uytterhoeven wrote:
> > Note that the build failure is more subtle: both m5307c3_defconfig and
> > m5475evb_defconfig build fine in m68k/for-linus, but fail in
> > next-20190708.  So it fails when combined with other changes, going
> > in through a different tree (the DMA tree?).
> 
> Yes, the dma tree adds the stub for the symbol and adds code relying
> on that.

If you give me an ack I can add the fix to the dma-mapping pull request.