linux-kernel - Re: [PATCH 5/7 v2] MIPS: use the generic uncached segment support in dma-direct

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Date:   Wed, 3 Jul 2019 10:54:05 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Ley Foon Tan <lftan@...era.com>,
        Michal Simek <monstr@...str.eu>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH 5/7 v2] MIPS: use the generic uncached segment support in dma-direct

On Mon, Jun 3, 2019 at 8:50 AM Christoph Hellwig <hch@....de> wrote:
>
> On Wed, May 01, 2019 at 05:13:57PM +0000, Paul Burton wrote:
> > Hi Christoph,
> >
> > On Wed, May 01, 2019 at 03:13:39PM +0200, Christoph Hellwig wrote:
> > > Stop providing our arch alloc/free hooks and just expose the segment
> > > offset instead.
> > >
> > > Signed-off-by: Christoph Hellwig <hch@....de>
> > > ---
> > >  arch/mips/Kconfig              |  1 +
> > >  arch/mips/include/asm/page.h   |  3 ---
> > >  arch/mips/jazz/jazzdma.c       |  6 ------
> > >  arch/mips/mm/dma-noncoherent.c | 26 +++++++++-----------------
> > >  4 files changed, 10 insertions(+), 26 deletions(-)
> >
> > This one looks good to me now, for patches 1 & 5:
> >
> >   Acked-by: Paul Burton <paul.burton@...s.com>
>
> Thanks, I've merged thos into the dma-mapping tree.

I think this is the cause of some kernelci failures in current
linux-next builds:

https://kernelci.org/build/next/branch/master/kernel/next-20190702/

bigsur_defconfig ‐ mips3 warnings — 1 error
cavium_octeon_defconfig ‐ mips3 warnings — 1 error
ip27_defconfig ‐ mips3 warnings — 1 error
loongson3_defconfig ‐ mips3 warnings — 1 error
mips_paravirt_defconfig ‐ mips3 warnings — 1 error
nlm_xlp_defconfig ‐ mips3 warnings — 1 error
nlm_xlr_defconfig ‐ mips1 warning — 1 error

/home/buildslave/workspace/workspace/kernel-build@...inux/build/../kernel/dma/direct.c:144:
undefined reference to `arch_dma_prep_coherent'
2/home/buildslave/workspace/kernel-build/linux/build/../kernel/dma/direct.c:144:
undefined reference to `arch_dma_prep_coherent'
2(.text+0xafc): undefined reference to `arch_dma_prep_coherent'
1direct.c:(.text+0x934): undefined reference to `arch_dma_prep_coherent'
1(.text+0xb84): undefined reference to `arch_dma_prep_coherent'

I haven't looked into the details, but I suspect all machines
with cache-coherent DMA are broken.

       Arnd