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Date: Mon, 9 Oct 2023 10:43:57 +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 9:41 AM Christoph Hellwig <hch@....de> wrote:
> CONFIG_DMA_GLOBAL_POOL can't be combined with other dma-coherent
> allocators.  Add dependencies to Kconfig to document this, and make
> kconfig complain about unment dependencies if someone tries.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

Thanks for your patch!

> --- a/kernel/dma/Kconfig
> +++ b/kernel/dma/Kconfig
> @@ -135,6 +135,8 @@ config DMA_COHERENT_POOL
>
>  config DMA_GLOBAL_POOL
>         select DMA_DECLARE_COHERENT
> +       depends on !ARCH_HAS_DMA_SET_UNCACHED
> +       depends on !DMA_DIRECT_REMAP
>         bool
>
>  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]

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

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