On 6/23/21 8:37 PM, Gavin Shan wrote:
> The empty NUMA nodes, where no memory resides in, are allowed. For
> these empty NUMA nodes, the 'len' of 'reg' property is zero. These
> empty NUMA node IDs are still valid and parsed. I finds difficulty
> to get where it's properly documented.
>
> So lets add note to empty NUMA nodes in the NUMA binding doc.
>
> Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
> ---
> 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..c564705c0eac 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 the empty NUMA nodes, which no memory resides in, are allowed
Missing period at end of the sentence above.
> +Their NUMA node IDs are still valid so that memory can be added into these
> +NUMA nodes through hotplug afterwards.
> +
> memory@c00000 {
> device_type = "memory";
> reg = <0x0 0xc00000 0x0 0x80000000>;
thanks.
