1 files changed, 27 insertions, 1 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 66e48aa2dd1b..78e642feac30 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -148,6 +148,9 @@ void __init e820_print_map(char *who)
                 case E820_NVS:
                         printk(KERN_CONT "(ACPI NVS)\n");
                         break;
+                case E820_UNUSABLE:
+                        printk("(unusable)\n");
+                        break;
                 default:
                         printk(KERN_CONT "type %u\n", e820.map[i].type);
                         break;
@@ -1260,6 +1263,7 @@ static inline const char *e820_type_to_string(int e820_type)
         case E820_RAM:  return "System RAM";
         case E820_ACPI: return "ACPI Tables";
         case E820_NVS:  return "ACPI Non-volatile Storage";
+        case E820_UNUSABLE:     return "Unusable memory";
         default:        return "reserved";
         }
 }
@@ -1267,6 +1271,7 @@ static inline const char *e820_type_to_string(int e820_type)
 /*
  * Mark e820 reserved areas as busy for the resource manager.
  */
+static struct resource __initdata *e820_res;
 void __init e820_reserve_resources(void)
 {
         int i;
@@ -1274,6 +1279,7 @@ void __init e820_reserve_resources(void)
         u64 end;
 
         res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
+        e820_res = res;
         for (i = 0; i < e820.nr_map; i++) {
                 end = e820.map[i].addr + e820.map[i].size - 1;
 #ifndef CONFIG_RESOURCES_64BIT
@@ -1287,7 +1293,14 @@ void __init e820_reserve_resources(void)
                 res->end = end;
 
                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
-                insert_resource(&iomem_resource, res);
+
+                /*
+                 * don't register the region that could be conflicted with
+                 * pci device BAR resource and insert them later in
+                 * pcibios_resource_survey()
+                 */
+                if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20))
+                        insert_resource(&iomem_resource, res);
                 res++;
         }
 
@@ -1299,6 +1312,19 @@ void __init e820_reserve_resources(void)
         }
 }
 
+void __init e820_reserve_resources_late(void)
+{
+        int i;
+        struct resource *res;
+
+        res = e820_res;
+        for (i = 0; i < e820.nr_map; i++) {
+                if (!res->parent && res->end)
+                        reserve_region_with_split(&iomem_resource, res->start, res->end, res->name);
+                res++;
+        }
+}
+
 char *__init default_machine_specific_memory_setup(void)
 {
         char *who = "BIOS-e820";