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| author | Robin Murphy <robin.murphy@arm.com> | 2018-12-11 18:48:48 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-12-12 14:43:43 +0000 |
| commit | 4ab215061554ae2a4b78744a5dd3b3c6639f16a7 (patch) | |
| tree | 47b51d9c71d7c0012c043a7f161c30e9b08fa80a /arch/arm64/Kconfig | |
| parent | 6e4ede698d1c17102e42c6f734f7d8cf60df28d5 (diff) | |
| download | lwn-4ab215061554ae2a4b78744a5dd3b3c6639f16a7.tar.gz lwn-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 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 3 |
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 |