[RFC PATCH v2 0/3] Support CPU hotplug for ARM64

[Xiongfeng Wang]

This patchset mark all the GICC node in MADT as possible CPUs even though it
is disabled. But only those enabled GICC node are marked as present CPUs.
So that kernel will initialize some CPU related data structure in advance before
the CPU is actually hot added into the system. This patchset also implement 
'acpi_(un)map_cpu()' and 'arch_(un)register_cpu()' for ARM64. These functions are
needed to enable CPU hotplug.

To support CPU hotplug, we need to add all the possible GICC node in MADT
including those CPUs that are not present but may be hot added later. Those
CPUs are marked as disabled in GICC nodes.

Changelog:

v1 -> v2:
	rebase the thrid patch to the lastest kernel

Xiongfeng Wang (3):
  ACPI / scan: evaluate _STA for processors declared via ASL Device
    statement
  arm64: mark all the GICC nodes in MADT as possible cpu
  arm64: Add CPU hotplug support

 arch/arm64/kernel/acpi.c  | 22 ++++++++++++++++++++++
 arch/arm64/kernel/setup.c | 19 ++++++++++++++++++-
 arch/arm64/kernel/smp.c   | 11 +++++------
 drivers/acpi/scan.c       | 12 ++++++++++++
 4 files changed, 57 insertions(+), 7 deletions(-)

-- 
1.7.12.4