Re: [PATCH 1/2 V2] memory-hotplug: fix BUG_ON in move_freepages()

[Xishi Qiu]

On 2015/4/18 4:05, Yasuaki Ishimatsu wrote:

> 
> Your patches will fix your issue.
> But, if BIOS reports memory first at node hot add, pgdat can
> not be initialized.
> 
> Memory hot add flows are as follows:
> 
> add_memory
>   ...
>   -> hotadd_new_pgdat()
>   ...
>   -> node_set_online(nid)
> 
> When calling hotadd_new_pgdat() for a hot added node, the node is
> offline because node_set_online() is not called yet. So if applying
> your patches, the pgdat is not initialized in this case.
> 
> Thanks,
> Yasuaki Ishimatsu
> 

Hi Yasuaki,

I'm not quite understand, when BIOS reports memory first, why pgdat
can not be initialized?
When hotadd a new node, hotadd_new_pgdat() will be called too, and
when hotadd memory to a existent node, it's no need to call hotadd_new_pgdat(),
right?

Thanks,
Xishi Qiu

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