diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index 2570643ba1c51fdbf3cbc19034f8baabc9b28607..62e051bab3b22db2a5608557882d1dc04184e7e3 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -193,37 +193,6 @@ unsigned long __init e820_end_of_ram(void)
 	return end_pfn;	
 }
 
-/*
- * Find the hole size in the range.
- */
-unsigned long __init e820_hole_size(unsigned long start, unsigned long end)
-{
-	unsigned long ram = 0;
-	int i;
-
-	for (i = 0; i < e820.nr_map; i++) {
-		struct e820entry *ei = &e820.map[i];
-		unsigned long last, addr;
-
-		if (ei->type != E820_RAM ||
-		    ei->addr+ei->size <= start ||
-		    ei->addr >= end)
-			continue;
-
-		addr = round_up(ei->addr, PAGE_SIZE);
-		if (addr < start)
-			addr = start;
-
-		last = round_down(ei->addr + ei->size, PAGE_SIZE);
-		if (last >= end)
-			last = end;
-
-		if (last > addr)
-			ram += last - addr;
-	}
-	return ((end - start) - ram);
-}
-
 /*
  * Mark e820 reserved areas as busy for the resource manager.
  */
@@ -364,6 +333,29 @@ void __init add_memory_region(unsigned long start, unsigned long size, int type)
 	e820.nr_map++;
 }
 
+/*
+ * Find the hole size (in bytes) in the memory range.
+ * @start: starting address of the memory range to scan
+ * @end: ending address of the memory range to scan
+ */
+unsigned long __init e820_hole_size(unsigned long start, unsigned long end)
+{
+	unsigned long start_pfn = start >> PAGE_SHIFT;
+	unsigned long end_pfn = end >> PAGE_SHIFT;
+	unsigned long ei_startpfn;
+	unsigned long ei_endpfn;
+	unsigned long ram = 0;
+	int i;
+
+	for (i = 0; i < e820.nr_map; i++) {
+		if (e820_find_active_region(&e820.map[i],
+					    start_pfn, end_pfn,
+					    &ei_startpfn, &ei_endpfn))
+			ram += ei_endpfn - ei_startpfn;
+	}
+	return end - start - (ram << PAGE_SHIFT);
+}
+
 void __init e820_print_map(char *who)
 {
 	int i;
diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
index 30bf8043984d4f2732edeefc653fb133cade22bb..0191b1ca6aa477d3ebd284ba15ae58b314ca2eb3 100644
--- a/arch/x86_64/mm/numa.c
+++ b/arch/x86_64/mm/numa.c
@@ -273,9 +273,6 @@ void __init numa_init_array(void)
 
 #ifdef CONFIG_NUMA_EMU
 /* Numa emulation */
-#define E820_ADDR_HOLE_SIZE(start, end)					\
-	(e820_hole_size((start) >> PAGE_SHIFT, (end) >> PAGE_SHIFT) <<	\
-	PAGE_SHIFT)
 char *cmdline __initdata;
 
 /*
@@ -319,7 +316,7 @@ static int __init split_nodes_equally(struct bootnode *nodes, u64 *addr,
 		return -1;
 	if (num_nodes > MAX_NUMNODES)
 		num_nodes = MAX_NUMNODES;
-	size = (max_addr - *addr - E820_ADDR_HOLE_SIZE(*addr, max_addr)) /
+	size = (max_addr - *addr - e820_hole_size(*addr, max_addr)) /
 	       num_nodes;
 	/*
 	 * Calculate the number of big nodes that can be allocated as a result
@@ -347,7 +344,7 @@ static int __init split_nodes_equally(struct bootnode *nodes, u64 *addr,
 		if (i == num_nodes + node_start - 1)
 			end = max_addr;
 		else
-			while (end - *addr - E820_ADDR_HOLE_SIZE(*addr, end) <
+			while (end - *addr - e820_hole_size(*addr, end) <
 			       size) {
 				end += FAKE_NODE_MIN_SIZE;
 				if (end > max_addr) {
@@ -488,7 +485,6 @@ static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
  	numa_init_array();
  	return 0;
 }
-#undef E820_ADDR_HOLE_SIZE
 #endif /* CONFIG_NUMA_EMU */
 
 void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)