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

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Date:   Wed, 13 Feb 2019 19:24:35 +0100
From:   Christoph Hellwig <hch@....de>
To:     Rob Herring <robh@...nel.org>
Cc:     Christoph Hellwig <hch@....de>,
        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 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?