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Date:	Tue, 14 Oct 2014 19:08:43 -0400
From:	Sasha Levin <>
To:	David Cohen <>,
	Yu Zhao <>
CC:	Andrew Morton <>,
	"Kirill A. Shutemov" <>,
	Mel Gorman <>, Rik van Riel <>,
	Ingo Molnar <>,
	Hugh Dickins <>, Bob Liu <>,
	Johannes Weiner <>,
	David Rientjes <>,
	Vlastimil Babka <>,,
Subject: Re: [PATCH 2/2] mm: verify compound order when freeing a page

On 10/14/2014 04:29 PM, David Cohen wrote:
>> +	VM_BUG_ON(PageTail(page));
>> > +	VM_BUG_ON(PageHead(page) && compound_order(page) != order);
> It may be too severe. AFAIU we're not talking about a fatal error.
> How about VM_WARN_ON()?

VM_BUG_ON() should catch anything which is not "supposed" to happen,
and not just the severe stuff. Unlike BUG_ON, VM_BUG_ON only gets
hit with mm debugging enabled.

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