diff --git a/core/kernel-space/base/syscall.c b/core/kernel-space/base/syscall.c
index f5b95b6..cc37a04 100644
--- a/core/kernel-space/base/syscall.c
+++ b/core/kernel-space/base/syscall.c
@@ -133,6 +133,18 @@ void disable_wp(unsigned long addr)
 }
 #endif
 
+#ifdef CONFIG_RISCV
+void enable_wp(unsigned long addr)
+{
+	return;
+}
+
+void disable_wp(unsigned long addr)
+{
+	return;
+}
+#endif
+
 kallsyms_lookup_name_t hk_kallsyms_lookup_name = NULL;
 static struct kprobe hk_kp = { .symbol_name = "kallsyms_lookup_name" };
 static void hk_kallsyms_lookup_name_init(void)
diff --git a/core/kernel-space/process/core.c b/core/kernel-space/process/core.c
index 0382103..4521be0 100644
--- a/core/kernel-space/process/core.c
+++ b/core/kernel-space/process/core.c
@@ -333,12 +333,12 @@ int process_protect_disable(void)
 	return 0;
 }
 
-int process_protect_init()
+int process_protect_init(void)
 {
 	return process_perm_hlist_init();
 }
 
-int process_protect_destory()
+int process_protect_destory(void)
 {
 	return process_protect_disable();
 }