[PATCH v6 0/4] enable movable nodes on non-x86 configs

From: Reza Arbab
Date: Mon Nov 07 2016 - 18:45:22 EST

This patchset allows more configs to make use of movable nodes. When
CONFIG_MOVABLE_NODE is selected, there are two ways to introduce such
nodes into the system:

1. Discover movable nodes at boot. Currently this is only possible on
x86, but we will enable configs supporting fdt to do the same.

2. Hotplug and online all of a node's memory using online_movable. This
is already possible on any config supporting memory hotplug, not
just x86, but the Kconfig doesn't say so. We will fix that.

We'll also remove some cruft on power which would prevent (2).

/* changelog */

* Add a patch enabling the fdt to describe hotpluggable memory.

* http://lkml.kernel.org/r/1477339089-5455-1-git-send-email-arbab@xxxxxxxxxxxxxxxxxx

* Drop the patches which recognize the "status" property of dt memory
nodes. Firmware can set the size of "linux,usable-memory" to zero instead.

* http://lkml.kernel.org/r/1475778995-1420-1-git-send-email-arbab@xxxxxxxxxxxxxxxxxx

* Rename of_fdt_is_available() to of_fdt_device_is_available().
Rename of_flat_dt_is_available() to of_flat_dt_device_is_available().

* Instead of restoring top-down allocation, ensure it never goes
bottom-up in the first place, by making movable_node arch-specific.

* Use MEMORY_HOTPLUG instead of PPC64 in the mm/Kconfig patch.

* http://lkml.kernel.org/r/1474828616-16608-1-git-send-email-arbab@xxxxxxxxxxxxxxxxxx

* Use Rob Herring's suggestions to improve the node availability check.

* More verbose commit log in the patch enabling CONFIG_MOVABLE_NODE.

* Add a patch to restore top-down allocation the way x86 does.

* http://lkml.kernel.org/r/1473883618-14998-1-git-send-email-arbab@xxxxxxxxxxxxxxxxxx

* Use the "status" property of standard dt memory nodes instead of
introducing a new "ibm,hotplug-aperture" compatible id.

* Remove the patch which explicitly creates a memoryless node. This set
no longer has any bearing on whether the pgdat is created at boot or
at the time of memory addition.

* http://lkml.kernel.org/r/1470680843-28702-1-git-send-email-arbab@xxxxxxxxxxxxxxxxxx

Reza Arbab (4):
powerpc/mm: allow memory hotplug into a memoryless node
mm: remove x86-only restriction of movable_node
mm: enable CONFIG_MOVABLE_NODE on non-x86 arches
of/fdt: mark hotpluggable memory

Documentation/kernel-parameters.txt | 2 +-
arch/powerpc/mm/numa.c | 13 +------------
arch/x86/kernel/setup.c | 24 ++++++++++++++++++++++++
drivers/of/fdt.c | 6 ++++++
mm/Kconfig | 2 +-
mm/memory_hotplug.c | 20 --------------------
6 files changed, 33 insertions(+), 34 deletions(-)