1 files changed, 16 insertions, 2 deletions

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 6fd7752cee96..ca45696f30fb 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;
         }