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Date: Sat, 10 Oct 2020 17:12:35 +0200
From: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To: robh+dt@...nel.org, catalin.marinas@....com, hch@....de,
ardb@...nel.org, linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>
Cc: robin.murphy@....com, linux-arm-kernel@...ts.infradead.org,
linux-rpi-kernel@...ts.infradead.org, jeremy.linton@....com,
iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
linux-mm@...ck.org
Subject: [PATCH v2 5/5] mm: Update DMA zones description
The default behavior for arm64 changed, so reflect that.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Acked-by: Catalin Marinas <catalin.marinas@....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.
*
* - powerpc only uses ZONE_DMA, the size, up to 2G, may vary
* depending on the specific device.
--
2.28.0
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