On Tue, 9 Sep 2014, Mel Gorman wrote:

> Since 2.6.24 there has been a paranoid check in move_freepages that looks
> up the zone of two pages. This is a very slow path and the only time I've
> seen this bug trigger recently is when memory initialisation was broken
> during patch development. Despite the fact it's a slow path, this patch
> converts the check to a VM_BUG_ON anyway as it is served its purpose by now.
> 
> Signed-off-by: Mel Gorman <[email protected]>

Acked-by: David Rientjes <[email protected]>
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