From 235f775351e8f7e47cff1baa1284e0df95e3234e Mon Sep 17 00:00:00 2001 From: Andrei Gherzan 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 --- 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