linux-kernel - Re: "mm: use early_pfn_to_nid in page_ext

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Date:   Tue, 4 Jul 2017 11:39:57 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Joonsoo Kim <js1304@...il.com>
Cc:     Michal Hocko <mhocko@...nel.org>, Yang Shi <yang.shi@...aro.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: "mm: use early_pfn_to_nid in page_ext_init" broken on some
 configurations?

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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