linux-kernel - Re: [PATCH 1/2] mm: hugetlbfs: Add some VM_BUG

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Message-ID: <20131115095731.GC26002@suse.de>
Date:	Fri, 15 Nov 2013 09:57:31 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Dave Hansen <dave@...1.net>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	dave.jiang@...el.com, akpm@...ux-foundation.org, dhillf@...il.com,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: Re: [PATCH 1/2] mm: hugetlbfs: Add some VM_BUG_ON()s to catch
 non-hugetlbfs pages

On Thu, Nov 14, 2013 at 03:33:58PM -0800, Dave Hansen wrote:
> 
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> Dave Jiang reported that he was seeing oopses when running
> NUMA systems and default_hugepagesz=1G.  I traced the issue down
> to migrate_page_copy() trying to use the same code for hugetlb
> pages and transparent hugepages.  It should not have been trying
> to pass thp pages in there.
> 
> So, add some VM_BUG_ON()s for the next hapless VM developer that
> tries the same thing.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> 

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs
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