From: Mel Gorman <mel@csn.ul.ie>

The pageblock flags store bits representing a MAX_ORDER_NR_PAGES block of
pages.  When calling get_pageblock_bitmap(), a non-aligned PFN is passed which
is then aligned to the MAX_ORDER_NR_PAGES block.  This alignment is
unnecessary.

This patch should be considered a fix to the patch
add-a-bitmap-that-is-used-to-track-flags-affecting-a-block-of-pages.patch .

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |    4 +---
 1 files changed, 1 insertion(+), 3 deletions(-)

diff -puN mm/page_alloc.c~add-a-bitmap-that-is-used-to-track-flags-affecting-a-block-of-pages-fix mm/page_alloc.c
--- a/mm/page_alloc.c~add-a-bitmap-that-is-used-to-track-flags-affecting-a-block-of-pages-fix
+++ a/mm/page_alloc.c
@@ -3432,9 +3432,7 @@ static inline unsigned long *get_pageblo
 							unsigned long pfn)
 {
 #ifdef CONFIG_SPARSEMEM
-	unsigned long blockpfn;
-	blockpfn = pfn & ~(MAX_ORDER_NR_PAGES - 1);
-	return __pfn_to_section(blockpfn)->pageblock_flags;
+	return __pfn_to_section(pfn)->pageblock_flags;
 #else
 	return zone->pageblock_flags;
 #endif /* CONFIG_SPARSEMEM */
_