# Re: \[PATCH v4 2/5\] drivers/of: do not add memory for unavailable nodes

- From: Reza Arbab \<hidden\>
- Date: 2016-10-24 18:20:17 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2016/10/4860274
- Thread: https://ratatoskr.run/linuxppc-dev/2016/10/4849459/t.md

```text
On Mon, Oct 24, 2016 at 09:24:04PM +1100, Michael Ellerman wrote:
>The code already looks for "linux,usable-memory" in preference to "reg". Can you use that instead?

Yes, we could set the size of "linux,usable-memory" to zero instead of setting status to "disabled".

I'll send a v5 of this set which drops 1/5 and 2/5. That would be the only difference here.

>That would have the advantage that existing kernels already understand
>it.
>
>Another problem with using "status" is we could have device trees out
>there that have status = disabled and we don't know about it, and by
>changing the kernel to use that property we break people's systems.
>Though for memory nodes my guess is that's not true, but you never know ...

-- 
Reza Arbab
```