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From: Christoph Hellwig <hch@lst.de>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: devicetree@vger.kernel.org, catalin.marinas@arm.com,
	linux-kernel@vger.kernel.org, jeremy.linton@arm.com,
	ardb@kernel.org, linux-mm@kvack.org,
	iommu@lists.linux-foundation.org, robh+dt@kernel.org,
	linux-rpi-kernel@lists.infradead.org,
	Andrew Morton <akpm@linux-foundation.org>,
	robin.murphy@arm.com, hch@lst.de,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 8/8] mm: Update DMA zones description
Date: Thu, 15 Oct 2020 07:40:26 +0200	[thread overview]
Message-ID: <20201015054026.GC12218@lst.de> (raw)
In-Reply-To: <20201014191211.27029-9-nsaenzjulienne@suse.de>

On Wed, Oct 14, 2020 at 09:12:10PM +0200, Nicolas Saenz Julienne wrote:
> The default behavior for arm64 changed, so reflect that.
> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> ---
>  include/linux/mmzone.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index fb3bf696c05e..4ee2306351b9 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -363,8 +363,9 @@ enum zone_type {
>  	 *  - arm only uses ZONE_DMA, the size, up to 4G, may vary depending on
>  	 *    the specific device.
>  	 *
> -	 *  - arm64 has a fixed 1G ZONE_DMA and ZONE_DMA32 for the rest of the
> -	 *    lower 4G.
> +	 *  - arm64 uses a single 4GB ZONE_DMA, except on the Raspberry Pi 4,
> +	 *    in which ZONE_DMA covers the first GB and ZONE_DMA32 the rest of
> +	 *    the lower 4GB.

Honestly I think this comment just needs to go away.  We can't really list
every setup in a comment in common code.
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      reply	other threads:[~2020-10-15  5:40 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-14 19:12 [PATCH v3 0/8] arm64: Default to 32-bit wide ZONE_DMA Nicolas Saenz Julienne
2020-10-14 19:12 ` [PATCH v3 1/8] arm64: mm: Move reserve_crashkernel() into mem_init() Nicolas Saenz Julienne
2020-10-15  8:40   ` Will Deacon
2020-10-15  8:55     ` Nicolas Saenz Julienne
2020-10-14 19:12 ` [PATCH v3 2/8] arm64: mm: Move zone_dma_bits initialization into zone_sizes_init() Nicolas Saenz Julienne
2020-10-14 19:12 ` [PATCH v3 3/8] of/address: Introduce of_dma_get_max_cpu_address() Nicolas Saenz Julienne
2020-10-14 22:02   ` Rob Herring
2020-10-15  6:56     ` Ard Biesheuvel
2020-10-15  9:16       ` Nicolas Saenz Julienne
2020-10-15  9:18         ` Ard Biesheuvel
2020-10-15  8:54     ` Nicolas Saenz Julienne
2020-10-15  5:42   ` Christoph Hellwig
2020-10-15 10:03     ` Nicolas Saenz Julienne
2020-10-16 13:19     ` Rob Herring
2020-10-14 19:12 ` [PATCH v3 4/8] of: unittest: Add test for of_dma_get_max_cpu_address() Nicolas Saenz Julienne
2020-10-14 22:04   ` Rob Herring
2020-10-15  9:51     ` Nicolas Saenz Julienne
2020-10-14 19:12 ` [PATCH v3 5/8] dma-direct: Turn zone_dma_bits default value into a define Nicolas Saenz Julienne
2020-10-15  5:38   ` Christoph Hellwig
2020-10-15 10:05     ` Nicolas Saenz Julienne
2020-10-14 19:12 ` [PATCH v3 6/8] arm64: mm: Set ZONE_DMA size based on devicetree's dma-ranges Nicolas Saenz Julienne
2020-10-15  5:39   ` Christoph Hellwig
2020-10-15 10:05     ` Nicolas Saenz Julienne
2020-10-14 19:12 ` [PATCH v3 7/8] arm64: mm: Set ZONE_DMA size based on early IORT scan Nicolas Saenz Julienne
2020-10-15 10:31   ` Lorenzo Pieralisi
2020-10-16  6:56     ` Ard Biesheuvel
2020-10-15 14:26   ` Hanjun Guo
2020-10-15 15:15     ` Nicolas Saenz Julienne
2020-10-15 18:03     ` Catalin Marinas
2020-10-16  6:51       ` Hanjun Guo
2020-10-16  6:54         ` Ard Biesheuvel
2020-10-16  7:27           ` Hanjun Guo
2020-10-16  7:34             ` Hanjun Guo
2020-10-14 19:12 ` [PATCH v3 8/8] mm: Update DMA zones description Nicolas Saenz Julienne
2020-10-15  5:40   ` Christoph Hellwig [this message]

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