Re: "mm: use early_pfn_to_nid in page_ext_init" broken on some configurations?

From: Vlastimil Babka
Date: Tue Jul 04 2017 - 05:40:17 EST

On 07/04/2017 07:23 AM, Joonsoo Kim wrote:
> On Mon, Jul 03, 2017 at 04:18:01PM +0200, Vlastimil Babka wrote:
>> allocated" looks much more sane there. But there's a warning nevertheless.
> Warning would comes from the fact that drain_all_pages() is called
> before mm_percpu_wq is initialised. We could remove WARN_ON_ONCE() and add
> drain_local_page(zone) to fix the problem.

Wouldn't that still leave some period during boot where kernel already
runs on multiple CPU's, but mm_percpu_wq is not yet initialized and
somebody tries to use it? We want to catch such cases, right?

> Thanks.
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