Stephen Rothwell [off-list ref] writes:

Hi Oliver,

On Wed, 12 Apr 2017 03:42:30 +1000 Oliver O'Halloran [off-list ref] wrote:

quoted

Flip the switch. Running around and screaming "IT'S ALIVE" is optional,
but recommended.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
---
 mm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 43d000e44424..d696af58f97f 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig

@@ -724,7 +724,7 @@ config ZONE_DEVICE
 	depends on MEMORY_HOTPLUG
 	depends on MEMORY_HOTREMOVE
 	depends on SPARSEMEM_VMEMMAP
-	depends on X86_64 #arch_add_memory() comprehends device memory
+	depends on (X86_64 || PPC_BOOK3S_64)  #arch_add_memory() comprehends device memory
 

That's fine, but at what point do we create
CONFIG_ARCH_HAVE_ZONE_DEVICE, replace the "depends on
<archs/platforms>" above with "depends on ARCH_HAVE_ZONE_DEVICE" and
select that from the appropriate places?

You mean CONFIG_HAVE_ZONE_DEVICE :)

A patch to do that, and update x86, would be a good precursor to this
series. It could probably go in right now, and be in place for when this
series lands.

cheers