1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index c7a4c5a9a21b..f79a02f64d10 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -837,7 +837,7 @@ int arch_add_memory(int nid, u64 start, u64 size)
         unsigned long nr_pages = size >> PAGE_SHIFT;
         int ret;
 
-        last_mapped_pfn = init_memory_mapping(start, start + size-1);
+        last_mapped_pfn = init_memory_mapping(start, start + size);
         if (last_mapped_pfn > max_pfn_mapped)
                 max_pfn_mapped = last_mapped_pfn;