linux-kernel - Re: [PATCH 06/12] dma-mapping: improve selection of dma_declare

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Message-ID: <CAL_JsqLCr4Jk_-cWUFGs5zfk+NKksc+bs0bpiBeQHsZFthaM1Q@mail.gmail.com>
Date:   Wed, 13 Feb 2019 13:27:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Linux IOMMU <iommu@...ts.linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lee Jones <lee.jones@...aro.org>, x86@...nel.org,
        arcml <linux-snps-arc@...ts.infradead.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>, linux-mips@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-riscv@...ts.infradead.org,
        SH-Linux <linux-sh@...r.kernel.org>,
        linux-xtensa@...ux-xtensa.org, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/12] dma-mapping: improve selection of
 dma_declare_coherent availability

On Wed, Feb 13, 2019 at 12:24 PM Christoph Hellwig <hch@....de> wrote:
>
> On Tue, Feb 12, 2019 at 02:40:23PM -0600, Rob Herring wrote:
> > > diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
> > > index 3607fd2810e4..f8c66a9472a4 100644
> > > --- a/drivers/of/Kconfig
> > > +++ b/drivers/of/Kconfig
> > > @@ -43,6 +43,7 @@ config OF_FLATTREE
> > >
> > >  config OF_EARLY_FLATTREE
> > >         bool
> > > +       select DMA_DECLARE_COHERENT
> >
> > Is selecting DMA_DECLARE_COHERENT okay on UML? We run the unittests with UML.
>
> No, that will fail with undefined references to memunmap.
>
> I gues this needs to be
>
>         select DMA_DECLARE_COHERENT if HAS_DMA
>
> > Maybe we should just get rid of OF_RESERVED_MEM. If we support booting
> > from DT, then it should always be enabled anyways.
>
> Fine with me.  Do you want me to respin the series to just remove
> it?

Either now or it can wait. I don't want to hold this up any.

Rob