+static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn)
+{
+#ifdef CONFIG_SPARSEMEM
+ pfn &= (PAGES_PER_SECTION-1);
+ return (pfn >> (MAX_ORDER-1)) * NR_PAGEBLOCK_BITS;
+#else
+ pfn = pfn - zone->zone_start_pfn;
+ return (pfn >> (MAX_ORDER-1)) * NR_PAGEBLOCK_BITS;
+#endif /* CONFIG_SPARSEMEM */
+}
+
+/**
+ * get_pageblock_flags_group - Return the requested group of flags for the MAX_ORDER_NR_PAGES block of pages
+ * @page: The page within the block of interest
+ * @start_bitidx: The first bit of interest to retrieve
+ * @end_bitidx: The last bit of interest
+ * returns pageblock_bits flags
+ */
+unsigned long get_pageblock_flags_group(struct page *page,
+ int start_bitidx, int end_bitidx)
+{
+ struct zone *zone;
+ unsigned long *bitmap;
+ unsigned long pfn, bitidx;
+ unsigned long flags = 0;
+ unsigned long value = 1;
+
+ zone = page_zone(page);
+ pfn = page_to_pfn(page);
+ bitmap = get_pageblock_bitmap(zone, pfn);
+ bitidx = pfn_to_bitidx(zone, pfn);
+
+ for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1)
+ if (test_bit(bitidx + start_bitidx, bitmap))
+ flags |= value;
+
+ return flags;
+}
+
+/**
+ * set_pageblock_flags_group - Set the requested group of flags for a MAX_ORDER_NR_PAGES block of pages
+ * @page: The page within the block of interest
+ * @start_bitidx: The first bit of interest
+ * @end_bitidx: The last bit of interest
+ * @flags: The flags to set
+ */
+void set_pageblock_flags_group(struct page *page, unsigned long flags,
+ int start_bitidx, int end_bitidx)
+{
+ struct zone *zone;
+ unsigned long *bitmap;
+ unsigned long pfn, bitidx;
+ unsigned long value = 1;
+
+ zone = page_zone(page);
+ pfn = page_to_pfn(page);
+ bitmap = get_pageblock_bitmap(zone, pfn);
+ bitidx = pfn_to_bitidx(zone, pfn);
+
+ for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1)
+ if (flags & value)
+ __set_bit(bitidx + start_bitidx, bitmap);
+ else
+ __clear_bit(bitidx + start_bitidx, bitmap);
+}