linux-kernel - [PATCH] arm64: Kconfig: select ZONE

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Date:   Thu, 17 Dec 2020 16:08:02 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     catalin.marinas@....com, will@...nel.org, nsaenzjulienne@...e.de
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Fan <peng.fan@....com>
Subject: [PATCH] arm64: Kconfig: select ZONE_DMA

From: Peng Fan <peng.fan@....com>

ZONE_DMA should not be disabled, otherwise arm64_dma_phys_limit is
left uninitialized and cause swiotlb have IO TLB above 4GB which
might crash some platforms

Signed-off-by: Peng Fan <peng.fan@....com>
---

Not sure whether need to address code to initialize the variables or
force select ZONE_DMA

 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 33446269f692..377b391a41d6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -206,6 +206,7 @@ config ARM64
 	select SWIOTLB
 	select SYSCTL_EXCEPTION_TRACE
 	select THREAD_INFO_IN_TASK
+	select ZONE_DMA
 	help
 	  ARM 64-bit (AArch64) Linux support.
 
-- 
2.28.0