On 11/10/16 23:26, Balbir Singh wrote:

On 07/10/16 05:36, Reza Arbab wrote:

quoted

Currently, CONFIG_MOVABLE_NODE depends on X86_64. In preparation to
enable it for other arches, we need to factor a detail which is unique
to x86 out of the generic mm code.

Specifically, as documented in kernel-parameters.txt, the use of
"movable_node" should remain restricted to x86:

movable_node    [KNL,X86] Boot-time switch to enable the effects
                of CONFIG_MOVABLE_NODE=y. See mm/Kconfig for details.

This option tells x86 to find movable nodes identified by the ACPI SRAT.
On other arches, it would have no benefit, only the undesired side
effect of setting bottom-up memblock allocation.

Since #ifdef CONFIG_MOVABLE_NODE will no longer be enough to restrict
this option to x86, move it to an arch-specific compilation unit
instead.

Signed-off-by: Reza Arbab <redacted>

Acked-by: Balbir Singh <bsingharora@gmail.com>

After the ack, I realized there were some more checks needed, IOW
questions for you :)

1. Have you checked to see if our memblock allocations spill
over to probably hotpluggable nodes?
2. Shouldn't we be marking nodes discovered as movable via
memblock_mark_hotplug()?

Balbir Singh.