2019-09-19 14:43:19 +00:00
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From 2722f08c4c59901bd506184e2dcbbbd532aef0b3 Mon Sep 17 00:00:00 2001
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2019-07-31 16:23:26 +00:00
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From: Andrei Gherzan <andrei@balena.io>
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Date: Tue, 16 Jul 2019 13:28:22 +0100
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] arm64/mm: Limit the DMA zone for arm64
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2019-07-31 16:23:26 +00:00
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On RaspberryPi, only the first 1Gb can be used for DMA[1].
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[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2019-July/665986.html
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Signed-off-by: Andrei Gherzan <andrei@balena.io>
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---
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arch/arm64/mm/init.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/arch/arm64/mm/init.c
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+++ b/arch/arm64/mm/init.c
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@@ -224,7 +224,7 @@ static void __init reserve_elfcorehdr(vo
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static phys_addr_t __init max_zone_dma_phys(void)
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{
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phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
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- return min(offset + (1ULL << 32), memblock_end_of_DRAM());
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+ return min(offset + (1ULL << 30), memblock_end_of_DRAM());
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}
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#ifdef CONFIG_NUMA
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