--- x/arch/x86/mm/fault.c
+++ y/arch/x86/mm/fault.c
@@ -1353,8 +1353,7 @@ void do_user_addr_fault(struct pt_regs *
 	}
 #endif
 
-	if (!(flags & FAULT_FLAG_USER))
-		goto lock_mmap;
+	goto lock_mmap;
 
 	vma = lock_vma_under_rcu(mm, address);
 	if (!vma)