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Date:   Fri, 11 Jun 2021 21:10:56 +0800
From:   Dong Aisheng <>
        Dong Aisheng <>,
        Christoph Hellwig <>,
        Marek Szyprowski <>,
        Robin Murphy <>
Subject: [PATCH 1/1] dma: coherent: check no-map property for arm64

Coherent dma on ARM64 also can't work with mapped system ram,
that means 'no-map' property must be specified in dts.
Add the missing check for ARM64 platforms as well.
Besides 'no-map' checking, 'linux,dma-default' feature is also
enabled for ARM64 along with this patch.

Cc: Christoph Hellwig <>
Cc: Marek Szyprowski <>
Cc: Robin Murphy <>
Signed-off-by: Dong Aisheng <>
 kernel/dma/coherent.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c
index 5b5b6c7ec7f2..d1831da7afba 100644
--- a/kernel/dma/coherent.c
+++ b/kernel/dma/coherent.c
@@ -356,7 +356,7 @@ static int __init rmem_dma_setup(struct reserved_mem *rmem)
 	if (of_get_flat_dt_prop(node, "reusable", NULL))
 		return -EINVAL;
-#ifdef CONFIG_ARM
+#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
 	if (!of_get_flat_dt_prop(node, "no-map", NULL)) {
 		pr_err("Reserved memory: regions without no-map are not yet supported\n");
 		return -EINVAL;

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