Andrea Arcangeli wrote:

Still I recommend investigating _why_ debug_pagealloc is violating the
API. It might not be necessary to wait for the pageattr universal
feature to make DEBUG_PAGEALLOC work safe.

OK, good to know.  But, for now, can we pull this out of -mm?  Or, at 
least that BUG_ON()?  DEBUG_PAGEALLOC is an awfully powerful debugging 
tool to just be removed like this.
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