diff --git a/src/43-kfuncs/module/Makefile b/src/43-kfuncs/module/Makefile
index ad10772..1245b52 100644
--- a/src/43-kfuncs/module/Makefile
+++ b/src/43-kfuncs/module/Makefile
@@ -3,6 +3,7 @@ obj-m += hello.o  # hello.o is the target
 # Enable BTF generation
 KBUILD_CFLAGS += -g -O2
 ccflags-y += -DCONFIG_BPF_SYSCALL
+KBUILD_MODPOST_WARN=1
 all:
 	# Compile the module with BTF information
 	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
diff --git a/src/43-kfuncs/module/hello.c b/src/43-kfuncs/module/hello.c
index c570b42..b0f5b33 100644
--- a/src/43-kfuncs/module/hello.c
+++ b/src/43-kfuncs/module/hello.c
@@ -17,19 +17,19 @@ __bpf_kfunc_start_defs();
 
 __bpf_kfunc int bpf_strstr(const char *str, u32 str__sz, const char *substr, u32 substr__sz)
 {
-    // const char *fmt = "strstr: str=%s, str__sz=%u, substr=%s\n";
-    // // bpf_trace_printk((u64)(void*)fmt, (u64)sizeof(fmt), (u64)(void*)str, (u64)str__sz, (u64)(void*)substr);
-    // // Edge case: if substr is empty, return 0 (assuming empty string is found at the start)
-    // const struct bpf_func_proto *proto = bpf_base_func_proto(BPF_FUNC_trace_printk, NULL);
-    // if (!proto) {
-    //     pr_err("bpf_trace_printk: Failed to get prototype\n");
-    //     return -1;
-    // }
-    // if (proto->func) {
-    //     proto->func((u64)(void*)fmt, (u64)sizeof(fmt), (u64)(void*)str, str__sz, (u64)(void*)substr);
-    // } else {
-    //     pr_err("bpf_trace_printk: Failed to get function pointer\n");
-    // }
+    const char *fmt = "strstr: str=%s, str__sz=%u, substr=%s\n";
+    // bpf_trace_printk((u64)(void*)fmt, (u64)sizeof(fmt), (u64)(void*)str, (u64)str__sz, (u64)(void*)substr);
+    // Edge case: if substr is empty, return 0 (assuming empty string is found at the start)
+    const struct bpf_func_proto *proto = bpf_base_func_proto(BPF_FUNC_trace_printk, NULL);
+    if (!proto) {
+        pr_err("bpf_trace_printk: Failed to get prototype\n");
+        return -1;
+    }
+    if (proto->func) {
+        proto->func((u64)(void*)fmt, (u64)sizeof(fmt), (u64)(void*)str, str__sz, (u64)(void*)substr);
+    } else {
+        pr_err("bpf_trace_printk: Failed to get function pointer\n");
+    }
     if (substr__sz == 0)
     {
         return 0;