linux-kernel - arm64: Kconfig: support for nodes spanning other nodes

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Message-Id: <20201029061950.4217-1-janghyuck.kim@samsung.com>
Date:   Thu, 29 Oct 2020 15:19:50 +0900
From:   Janghyuck Kim <janghyuck.kim@...sung.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     janghyuck.kim@...sung.com, hyesoo.yu@...sung.com,
        pullip.cho@...sung.com, Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: arm64: Kconfig: support for nodes spanning other nodes

To support NUMA systems whose physical address layout is not continuous
on one node, nodes spanning other nodes feature is required.

Signed-off-by: Janghyuck Kim <janghyuck.kim@...sung.com>
---
 arch/arm64/Kconfig | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 49b8d017cba6..18ff7ce9dd60 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1004,6 +1004,14 @@ 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.  See memmap_init_zone()
+# for details.
+config NODES_SPAN_OTHER_NODES
+	depends on NUMA
+
 source "kernel/Kconfig.hz"
 
 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
-- 
2.28.0