# Re: \[PATCH 2/2\] fadump: Disable deferred page struct initialisation

- From: Vlastimil Babka \<hidden\>
- Date: 2016-08-03 06:07:23 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2016/08/6481602
- Thread: https://ratatoskr.run/linux-mm/2016/08/6481589/t.md

```text
On 08/03/2016 07:20 AM, Balbir Singh wrote:
> On Tue, 2016-08-02 at 18:49 +0530, Srikar Dronamraju wrote:
>> Fadump kernel reserves significant number of memory blocks. On a multi-node
>> machine, with CONFIG_DEFFERRED_STRUCT_PAGE support, fadump kernel fails to
>> boot. Fix this by disabling deferred page struct initialisation.
>>
>
> How much memory does a fadump kernel need? Can we bump up the limits depending
> on the config. I presume when you say fadump kernel you mean kernel with
> FADUMP in the config?
>
> BTW, I would much rather prefer a config based solution that does not select
> DEFERRED_INIT if FADUMP is enabled.

IIRC the kdump/fadump kernel is typically the same vmlinux as the main kernel, just with special initrd and boot params. So if you want deferred init for the main kernel, this would be impractical.

> Balbir
>
```