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From 235f775351e8f7e47cff1baa1284e0df95e3234e Mon Sep 17 00:00:00 2001
From: Andrei Gherzan <andrei@balena.io>
Date: Tue, 16 Jul 2019 13:28:22 +0100
Subject: [PATCH] arm64/mm: Limit the DMA zone for arm64
On RaspberryPi, only the first 1Gb can be used for DMA[1].
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2019-July/665986.html
Signed-off-by: Andrei Gherzan <andrei@balena.io>
---
arch/arm64/mm/init.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -177,7 +177,7 @@ static void __init reserve_elfcorehdr(vo
static phys_addr_t __init max_zone_dma_phys(void)
{
phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
- return min(offset + (1ULL << 32), memblock_end_of_DRAM());
+ return min(offset + (1ULL << 30), memblock_end_of_DRAM());
}
#ifdef CONFIG_NUMA
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