[PATCH] Revert "mm: use aligned zone start for pfn_to_bitidxcalculation"

[Ingo Molnar]

This reverts commit c060f943d0929f3e429c5d9522290584f6281d6e.

Causes lockups.

Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cf46618..3a120bb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5590,7 +5590,7 @@ static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn)
 	pfn &= (PAGES_PER_SECTION-1);
 	return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
 #else
-	pfn = pfn - round_down(zone->zone_start_pfn, pageblock_nr_pages);
+	pfn = pfn - zone->zone_start_pfn;
 	return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
 #endif /* CONFIG_SPARSEMEM */
 }
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