linux-kernel - [PATCH] arm64: Kconfig: Enable NODES_SPAN_OTHER

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Date:   Mon,  3 Feb 2020 11:55:14 -0800
From:   Hoan Tran <Hoan@...amperecomputing.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        patches@...amperecomputing.com,
        Hoan Tran <Hoan@...amperecomputing.com>
Subject: [PATCH] arm64: Kconfig: Enable NODES_SPAN_OTHER_NODES config for NUMA

Some NUMA nodes have memory ranges that span other nodes.
Even though a pfn is valid and between a node's start and end pfns,
it may not reside on that node.

This patch enables NODES_SPAN_OTHER_NODES config for NUMA to support
this type of NUMA layout.

Signed-off-by: Hoan Tran <Hoan@...amperecomputing.com>
---
 arch/arm64/Kconfig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e688dfa..939d28f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -959,6 +959,13 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK
 config HOLES_IN_ZONE
 	def_bool y
 
+# Some NUMA nodes have memory ranges that span other nodes.
+# Even though a pfn is valid and between a node's start and end pfns,
+# it may not reside on that node.
+config NODES_SPAN_OTHER_NODES
+	def_bool y
+	depends on ACPI_NUMA
+
 source "kernel/Kconfig.hz"
 
 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
-- 
1.8.3.1