diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index d6022d1f51d1..63f441797c96 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -182,8 +182,8 @@ static void __init arm_bootmem_init(struct meminfo *mi,
 	 * Reserve the memblock reserved regions in bootmem.
 	 */
 	for_each_memblock(reserved, reg) {
-		phys_addr_t start = memblock_region_base_pfn(reg);
-		phys_addr_t end = memblock_region_end_pfn(reg);
+		phys_addr_t start = memblock_region_reserved_base_pfn(reg);
+		phys_addr_t end = memblock_region_reserved_end_pfn(reg);
 		if (start >= start_pfn && end <= end_pfn)
 			reserve_bootmem_node(pgdat, __pfn_to_phys(start),
 					     (end - start) << PAGE_SHIFT,
@@ -251,8 +251,8 @@ static void arm_memory_present(void)
 	struct memblock_region *reg;
 
 	for_each_memblock(memory, reg)
-		memory_present(0, memblock_region_base_pfn(reg),
-			       memblock_region_end_pfn(reg));
+		memory_present(0, memblock_region_memory_base_pfn(reg),
+			       memblock_region_memory_end_pfn(reg));
 }
 #endif
 
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index f661f6c527da..a66499650909 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -148,8 +148,8 @@ walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 	int ret = -1;
 
 	for_each_memblock(memory, reg) {
-		tstart = max(start_pfn, memblock_region_base_pfn(reg));
-		tend = min(end_pfn, memblock_region_end_pfn(reg));
+		tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
+		tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
 		if (tstart >= tend)
 			continue;
 		ret = (*func)(tstart, tend - tstart, arg);
@@ -195,8 +195,8 @@ void __init do_init_bootmem(void)
 	/* Add active regions with valid PFNs */
 	for_each_memblock(memory, reg) {
 		unsigned long start_pfn, end_pfn;
-		start_pfn = memblock_region_base_pfn(reg);
-		end_pfn = memblock_region_end_pfn(reg);
+		start_pfn = memblock_region_memory_base_pfn(reg);
+		end_pfn = memblock_region_memory_end_pfn(reg);
 		add_active_range(0, start_pfn, end_pfn);
 	}
 
@@ -236,9 +236,9 @@ static int __init mark_nonram_nosave(void)
 
 	for_each_memblock(memory, reg) {
 		if (prev &&
-		    memblock_region_end_pfn(prev) < memblock_region_base_pfn(reg))
-			register_nosave_region(memblock_region_end_pfn(prev),
-					       memblock_region_base_pfn(reg));
+		    memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
+			register_nosave_region(memblock_region_memory_end_pfn(prev),
+					       memblock_region_memory_base_pfn(reg));
 		prev = reg;
 	}
 	return 0;
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 066fb443ba5a..74505b245374 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -811,8 +811,8 @@ static void __init setup_nonnuma(void)
 	       (top_of_ram - total_ram) >> 20);
 
 	for_each_memblock(memory, reg) {
-		start_pfn = memblock_region_base_pfn(reg);
-		end_pfn = memblock_region_end_pfn(reg);
+		start_pfn = memblock_region_memory_base_pfn(reg);
+		end_pfn = memblock_region_memory_end_pfn(reg);
 
 		fake_numa_create_new_node(end_pfn, &nid);
 		add_active_range(nid, start_pfn, end_pfn);
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index b977475f7446..552bea5113f5 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -244,8 +244,8 @@ static void __init do_init_bootmem(void)
 	/* Add active regions with valid PFNs. */
 	for_each_memblock(memory, reg) {
 		unsigned long start_pfn, end_pfn;
-		start_pfn = memblock_region_base_pfn(reg);
-		end_pfn = memblock_region_end_pfn(reg);
+		start_pfn = memblock_region_memory_base_pfn(reg);
+		end_pfn = memblock_region_memory_end_pfn(reg);
 		__add_active_range(0, start_pfn, end_pfn);
 	}
 
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index dc584d26d597..4c2572773b55 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -1294,8 +1294,8 @@ static void __init bootmem_init_nonnuma(void)
 		if (!reg->size)
 			continue;
 
-		start_pfn = memblock_region_base_pfn(reg);
-		end_pfn = memblock_region_end_pfn(reg);
+		start_pfn = memblock_region_memory_base_pfn(reg);
+		end_pfn = memblock_region_memory_end_pfn(reg);
 		add_active_range(0, start_pfn, end_pfn);
 	}
 
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 5096458c7535..62a10c2a11f2 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -111,40 +111,39 @@ extern void memblock_set_current_limit(phys_addr_t limit);
  */
 
 /**
- * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
+ * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
  * @reg: memblock_region structure
  */
-static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
+static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 {
-	return reg->base >> PAGE_SHIFT;
+	return PFN_UP(reg->base);
 }
 
 /**
- * memblock_region_last_pfn - Return the highest pfn intersecting with the region
+ * memblock_region_memory_end_pfn - Return the end_pfn this region
  * @reg: memblock_region structure
  */
-static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
+static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 {
-	return (reg->base + reg->size - 1) >> PAGE_SHIFT;
+	return PFN_DOWN(reg->base + reg->size);
 }
 
 /**
- * memblock_region_end_pfn - Return the pfn of the first page following the region
- *                      but not intersecting it
+ * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
  * @reg: memblock_region structure
  */
-static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
+static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 {
-	return memblock_region_last_pfn(reg) + 1;
+	return PFN_DOWN(reg->base);
 }
 
 /**
- * memblock_region_pages - Return the number of pages covering a region
+ * memblock_region_reserved_end_pfn - Return the end_pfn this region
  * @reg: memblock_region structure
  */
-static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
+static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 {
-	return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
+	return PFN_UP(reg->base + reg->size);
 }
 
 #define for_each_memblock(memblock_type, region)					\