On 6/24/21 10:23 PM, Gavin Shan wrote:
> The empty memory nodes, where no memory resides in, are allowed.
> For these empty memory nodes, the 'len' of 'reg' property is zero.
> The NUMA node IDs are still valid and parsed, but memory can be
> added to them through hotplug afterwards. I finds difficulty to
> get where it's properly documented.
>
> So lets add note to empty memory nodes in the NUMA binding doc.
>
> Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Thanks.
> ---
> Documentation/devicetree/bindings/numa.txt | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/numa.txt b/Documentation/devicetree/bindings/numa.txt
> index 21b35053ca5a..0fc882e44270 100644
> --- a/Documentation/devicetree/bindings/numa.txt
> +++ b/Documentation/devicetree/bindings/numa.txt
> @@ -109,6 +109,10 @@ Example:
> Dual socket system consists of 2 boards connected through ccn bus and
> each board having one socket/soc of 8 cpus, memory and pci bus.
>
> +Note that empty memory nodes, which no memory resides in, are allowed.
> +The NUMA node IDs in these empty memory nodes are still valid, but
> +memory can be added into them through hotplug afterwards.
> +
> memory@c00000 {
> device_type = "memory";
> reg = <0x0 0xc00000 0x0 0x80000000>;
>
