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authorRobin Murphy <robin.murphy@arm.com>2018-12-11 18:48:48 +0000
committerWill Deacon <will.deacon@arm.com>2018-12-12 14:43:43 +0000
commit4ab215061554ae2a4b78744a5dd3b3c6639f16a7 (patch)
tree47b51d9c71d7c0012c043a7f161c30e9b08fa80a /arch/arm64/Kconfig
parentarm64: percpu: Fix LSE implementation of value-returning pcpu atomics (diff)
downloadlinux-dev-4ab215061554ae2a4b78744a5dd3b3c6639f16a7.tar.xz
linux-dev-4ab215061554ae2a4b78744a5dd3b3c6639f16a7.zip
arm64: Add memory hotplug support
Wire up the basic support for hot-adding memory. Since memory hotplug is fairly tightly coupled to sparsemem, we tweak pfn_valid() to also cross-check the presence of a section in the manner of the generic implementation, before falling back to memblock to check for no-map regions within a present section as before. By having arch_add_memory(() create the linear mapping first, this then makes everything work in the way that __add_section() expects. We expect hotplug to be ACPI-driven, so the swapper_pg_dir updates should be safe from races by virtue of the global device hotplug lock. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to '')
-rw-r--r--arch/arm64/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 47c1f21e81dc..e9af113c572f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -261,6 +261,9 @@ config ZONE_DMA32
config HAVE_GENERIC_GUP
def_bool y
+config ARCH_ENABLE_MEMORY_HOTPLUG
+ def_bool y
+
config SMP
def_bool y