linux-kernel - Re: vmemmap_verify() BUGs during memory hotplug (4.2-rc1 regression)

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Date:	Tue, 28 Jul 2015 18:09:30 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: vmemmap_verify() BUGs during memory hotplug (4.2-rc1 regression)

On 27/07/15 16:41, Mel Gorman wrote:
> On Mon, Jul 27, 2015 at 04:32:45PM +0100, David Vrabel wrote:
>> Mel,
>>
>> As of commit 8a942fdea560d4ac0e9d9fabcd5201ad20e0c382 (mm: meminit: make
>> __early_pfn_to_nid SMP-safe and introduce meminit_pfn_in_nid)
>> vmemmap_verify() will BUG_ON() during memory hotplug because of its use
>> of early_pfn_to_nid().  Previously, it would have reported bogus (or
>> failed to report valid) warnings.
>>
> 
> Please test "mm, meminit: Allow early_pfn_to_nid to be used during
> runtime"

That fixed the BUG_ON() thanks.  But I still can't only the new sections
because their first page is not reserved, but I've not had time to
investigate why this is yet.

David
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