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From:   Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To:     robh+dt@kernel.org, catalin.marinas@arm.com, hch@lst.de,
        robin.murphy@arm.com, devicetree@vger.kernel.org,
        iommu@lists.linux-foundation.org, linux-mm@kvack.org,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     will@kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-rpi-kernel@lists.infradead.org,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [PATCH 4/4] mm: Update DMA zones description
Date:   Thu,  1 Oct 2020 18:17:40 +0200
Message-Id: <20201001161740.29064-5-nsaenzjulienne@suse.de>
In-Reply-To: <20201001161740.29064-1-nsaenzjulienne@suse.de>
References: <20201001161740.29064-1-nsaenzjulienne@suse.de>
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The default behavior for arm64 changed, so reflect that.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 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..d28ce77ccc2a 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.
 	 *
 	 *  - powerpc only uses ZONE_DMA, the size, up to 2G, may vary
 	 *    depending on the specific device.
-- 
2.28.0