[PATCH 0/3] memory-hotplug: improve rezoning capability

[Reza Arbab <arbab@linux.vnet.ibm.com>]

While it is currently possible to rezone memory when it is onlined, there are
implicit assumptions about the zones:

* To "online_kernel" a block into ZONE_NORMAL, it must currently
  be in ZONE_MOVABLE.

* To "online_movable" a block into ZONE_MOVABLE, it must currently
  be in (ZONE_MOVABLE - 1).

So on powerpc, where new memory is hotplugged into ZONE_DMA, these operations
do not work.

This patchset replaces the qualifications above with a more general
validation of zone movement.

Reza Arbab (3):
  memory-hotplug: add move_pfn_range()
  memory-hotplug: more general validation of zone during online
  memory-hotplug: use zone_can_shift() for sysfs valid_zones attribute

 drivers/base/memory.c          | 28 ++++++++++-------
 include/linux/memory_hotplug.h |  2 ++
 mm/memory_hotplug.c            | 70 ++++++++++++++++++++++++++++++++++--------
 3 files changed, 77 insertions(+), 23 deletions(-)

-- 
1.8.3.1

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