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Date:   Mon, 8 Jul 2019 22:37:33 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     Christoph Hellwig <hch@lst.de>, Guenter Roeck <linux@roeck-us.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        linux-m68k <linux-m68k@lists.linux-m68k.org>,
        Greg Ungerer <gerg@linux-m68k.org>
Subject: Re: m68k build failures in -next: undefined reference to
 `arch_dma_prep_coherent'
Message-ID: <20190708203733.GA15607@lst.de>
References: <20190708170647.GA12313@roeck-us.net> <CAMuHMdUnSqKHA7EN1S8U7eBODs4gi-raw4P3FxnR_afhb2Zd5g@mail.gmail.com> <20190708194516.GA18304@roeck-us.net> <CAMuHMdVKKkx_S_mXmCzckyiw1fbLQMEZroRT+UchHv+tgF-3RA@mail.gmail.com> <20190708202226.GA15167@lst.de> <CAMuHMdUUpyiRp3LdfE0M96dM6kAzse+gfXWqEQWe9ScwT9GX4A@mail.gmail.com>
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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.