1 files changed, 16 insertions, 2 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 6fd7752..ca45696 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -920,8 +920,22 @@ void __init setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_X86_64
 	if (max_pfn > max_low_pfn) {
-		max_pfn_mapped = init_memory_mapping(1UL<<32,
-						     max_pfn<<PAGE_SHIFT);
+		int i;
+		unsigned long start, end;
+		unsigned long start_pfn, end_pfn;
+
+		for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn,
+							 NULL) {
+
+			end = PFN_PHYS(end_pfn);
+			if (end <= (1UL<<32))
+				continue;
+
+			start = PFN_PHYS(start_pfn);
+			max_pfn_mapped = init_memory_mapping(
+						max((1UL<<32), start), end);
+		}
+
 		/* can we preseve max_low_pfn ?*/
 		max_low_pfn = max_pfn;
 	}