diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c
index 21e8b595cbb12d6be0d39e502d1f0a26090454a2..fe814fd5e0140fbf7c4c1aacccc7993e89febbac 100644
--- a/arch/x86/mm/cpu_entry_area.c
+++ b/arch/x86/mm/cpu_entry_area.c
@@ -122,7 +122,8 @@ static __init void setup_cpu_entry_area_ptes(void)
 	start = CPU_ENTRY_AREA_BASE;
 	end = start + CPU_ENTRY_AREA_MAP_SIZE;
 
-	for (; start < end; start += PMD_SIZE)
+	/* Careful here: start + PMD_SIZE might wrap around */
+	for (; start < end && start >= CPU_ENTRY_AREA_BASE; start += PMD_SIZE)
 		populate_extra_pte(start);
 #endif
 }