[PATCH 6/9] powerpc, mm: Enable ZONE_DEVICE on powerpc

[Michael Ellerman]

Stephen Rothwell <sfr at canb.auug.org.au> writes:

> Hi Oliver,
>
> On Wed, 12 Apr 2017 03:42:30 +1000 Oliver O'Halloran <oohall at gmail.com> wrote:
>>
>> Flip the switch. Running around and screaming "IT'S ALIVE" is optional,
>> but recommended.
>> 
>> Signed-off-by: Oliver O'Halloran <oohall at 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