linux-kernel - [PATCH 1/6] arm64/mm: Enable sysfs based memory hot add interface

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Date:   Wed,  3 Apr 2019 10:00:01 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org, will.deacon@....com,
        catalin.marinas@....com
Cc:     mhocko@...e.com, mgorman@...hsingularity.net, james.morse@....com,
        mark.rutland@....com, robin.murphy@....com, cpandya@...eaurora.org,
        arunks@...eaurora.org, dan.j.williams@...el.com, osalvador@...e.de,
        logang@...tatee.com, pasha.tatashin@...cle.com, david@...hat.com,
        cai@....pw
Subject: [PATCH 1/6] arm64/mm: Enable sysfs based memory hot add interface

Sysfs memory probe interface (/sys/devices/system/memory/probe) can accept
starting physical address of an entire memory block to be hot added into
the kernel. This is in addition to the existing ACPI based interface. This
just enables it with the required config CONFIG_ARCH_MEMORY_PROBE.

Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/arm64/Kconfig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7e34b9e..a2418fb 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -266,6 +266,15 @@ config HAVE_GENERIC_GUP
 config ARCH_ENABLE_MEMORY_HOTPLUG
 	def_bool y
 
+config ARCH_MEMORY_PROBE
+	bool "Enable /sys/devices/system/memory/probe interface"
+	depends on MEMORY_HOTPLUG
+	help
+	  This option enables a sysfs /sys/devices/system/memory/probe
+	  interface for testing. See Documentation/memory-hotplug.txt
+	  for more information. If you are unsure how to answer this
+	  question, answer N.
+
 config SMP
 	def_bool y
 
-- 
2.7.4