Messages in this thread | | | Subject | Re: "mm: use early_pfn_to_nid in page_ext_init" broken on some configurations? | From | Vlastimil Babka <> | Date | Tue, 4 Jul 2017 11:39:57 +0200 |
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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?
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