mm: modify pgdat_balanced() so that it also handles order-0
Teach pgdat_balanced() about order-0 allocations so that we can simplify code in a few places in vmstat.c. Suggested-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NZlatko Calusic <zlatko.calusic@iskon.hr> Cc: Mel Gorman <mgorman@suse.de> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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