1 files changed, 54 insertions, 25 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 95b81c18b6b..fb638d9ce6d 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -131,6 +131,31 @@ void __init e820_add_region(u64 start, u64 size, int type)
 	__e820_add_region(&e820, start, size, type);
 }
 
+static void __init e820_print_type(u32 type)
+{
+	switch (type) {
+	case E820_RAM:
+	case E820_RESERVED_KERN:
+		printk(KERN_CONT "(usable)");
+		break;
+	case E820_RESERVED:
+		printk(KERN_CONT "(reserved)");
+		break;
+	case E820_ACPI:
+		printk(KERN_CONT "(ACPI data)");
+		break;
+	case E820_NVS:
+		printk(KERN_CONT "(ACPI NVS)");
+		break;
+	case E820_UNUSABLE:
+		printk(KERN_CONT "(unusable)");
+		break;
+	default:
+		printk(KERN_CONT "type %u", type);
+		break;
+	}
+}
+
 void __init e820_print_map(char *who)
 {
 	int i;
@@ -140,27 +165,8 @@ void __init e820_print_map(char *who)
 		       (unsigned long long) e820.map[i].addr,
 		       (unsigned long long)
 		       (e820.map[i].addr + e820.map[i].size));
-		switch (e820.map[i].type) {
-		case E820_RAM:
-		case E820_RESERVED_KERN:
-			printk(KERN_CONT "(usable)\n");
-			break;
-		case E820_RESERVED:
-			printk(KERN_CONT "(reserved)\n");
-			break;
-		case E820_ACPI:
-			printk(KERN_CONT "(ACPI data)\n");
-			break;
-		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;
-		}
+		e820_print_type(e820.map[i].type);
+		printk(KERN_CONT "\n");
 	}
 }
 
@@ -427,6 +433,7 @@ static u64 __init __e820_update_range(struct e820map *e820x, u64 start,
 					u64 size, unsigned old_type,
 					unsigned new_type)
 {
+	u64 end;
 	unsigned int i;
 	u64 real_updated_size = 0;
 
@@ -435,21 +442,43 @@ static u64 __init __e820_update_range(struct e820map *e820x, u64 start,
 	if (size > (ULLONG_MAX - start))
 		size = ULLONG_MAX - start;
 
+	end = start + size;
+	printk(KERN_DEBUG "e820 update range: %016Lx - %016Lx ",
+		       (unsigned long long) start,
+		       (unsigned long long) end);
+	e820_print_type(old_type);
+	printk(KERN_CONT " ==> ");
+	e820_print_type(new_type);
+	printk(KERN_CONT "\n");
+
 	for (i = 0; i < e820x->nr_map; i++) {
 		struct e820entry *ei = &e820x->map[i];
 		u64 final_start, final_end;
+		u64 ei_end;
+
 		if (ei->type != old_type)
 			continue;
-		/* totally covered? */
-		if (ei->addr >= start &&
-		    (ei->addr + ei->size) <= (start + size)) {
+
+		ei_end = ei->addr + ei->size;
+		/* totally covered by new range? */
+		if (ei->addr >= start && ei_end <= end) {
 			ei->type = new_type;
 			real_updated_size += ei->size;
 			continue;
 		}
+
+		/* new range is totally covered? */
+		if (ei->addr < start && ei_end > end) {
+			__e820_add_region(e820x, start, size, new_type);
+			__e820_add_region(e820x, end, ei_end - end, ei->type);
+			ei->size = start - ei->addr;
+			real_updated_size += size;
+			continue;
+		}
+
 		/* partially covered */
 		final_start = max(start, ei->addr);
-		final_end = min(start + size, ei->addr + ei->size);
+		final_end = min(end, ei_end);
 		if (final_start >= final_end)
 			continue;