x86: fix e820_update_range size when overlapping

before that we relay on sanitize_e820_map to remove the overlap.

but e820_update_range(,,E820_RESERVED, E820_RAM) will not work

this patch fix that

who is going to use this?
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/e820.c

@@ -425,6 +425,11 @@ u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
 		e820_add_region(final_start, final_end - final_start,
 					 new_type);
 		real_updated_size += final_end - final_start;
+
+		ei->size -= final_end - final_start;
+		if (ei->addr < final_start)
+			continue;
+		ei->addr = final_end;
 	}
 	return real_updated_size;
 }