netdev - Re: [PATCH 1/6] dma-direct: add depdenencies to CONFIG_DMA_GLOBAL

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Message-ID: <CAMuHMdUZNewD-QC8J7MWSBP197Vc169meOjjK6=b7M11kVjUzg@mail.gmail.com>
Date: Mon, 9 Oct 2023 11:34:55 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Christoph Hellwig <hch@....de>
Cc: iommu@...ts.linux.dev, Robin Murphy <robin.murphy@....com>, 
	Marek Szyprowski <m.szyprowski@...sung.com>, Wei Fang <wei.fang@....com>, 
	Shenwei Wang <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>, 
	NXP Linux Team <linux-imx@....com>, linux-m68k@...ts.linux-m68k.org, netdev@...r.kernel.org, 
	Jim Quinlan <james.quinlan@...adcom.com>, linux-riscv <linux-riscv@...ts.infradead.org>, 
	Linux-Renesas <linux-renesas-soc@...r.kernel.org>, 
	"Lad, Prabhakar" <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 1/6] dma-direct: add depdenencies to CONFIG_DMA_GLOBAL_POOL

Hi Christoph,

On Mon, Oct 9, 2023 at 11:16 AM Christoph Hellwig <hch@....de> wrote:
> On Mon, Oct 09, 2023 at 10:43:57AM +0200, Geert Uytterhoeven wrote:
> > >  config DMA_DIRECT_REMAP
> >
> > riscv defconfig + CONFIG_NONPORTABLE=y + CONFIG_ARCH_R9A07G043=y:
> >
> > WARNING: unmet direct dependencies detected for DMA_GLOBAL_POOL
> >   Depends on [n]: !ARCH_HAS_DMA_SET_UNCACHED [=n] && !DMA_DIRECT_REMAP [=y]
> >   Selected by [y]:
> >   - ARCH_R9A07G043 [=y] && SOC_RENESAS [=y] && RISCV [=y] && NONPORTABLE [=y]
>
> And that's exactly what this patch is supposed to show.  RISCV must not
> select DMA_DIRECT_REMAP at the same time as DMA_GLOBAL_POOL.  I though
> the fix for that just went upstream?

The fix you are referring too is probably commit c1ec4b450ab729e3
("soc: renesas: Make ARCH_R9A07G043 (riscv version) depend
on NONPORTABLE") in next-20231006 and later.  It is not yet upstream.

Still, it merely makes ARCH_R9A07G043 (which selects DMA_GLOBAL_POOL)
depend on ARCH_R9A07G043.
RISCV_DMA_NONCOHERENT still selects DMA_DIRECT_REMAP, so both can end
up being enabled.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds