Remove toplevel trash, add debugfs and kernel config fragment

kernel_module/package/kernel_module/src/Makefile

@@ -1,4 +1,4 @@
-obj-m += hello.o hello2.o
+obj-m += debugfs.o hello.o hello2.o
 ccflags-y := -Wno-declaration-after-statement -std=gnu99
 
 .PHONY: all clean

kernel_module/package/kernel_module/src/debugfs.c

@@ -0,0 +1,45 @@
+/*
+Adapted from: https://github.com/chadversary/debugfs-tutorial/blob/47b3cf7ca47208c61ccb51b27aac6f9f932bfe0b/example1/debugfs_example1.c
+
+Requires CONFIG_DEBUG_FS.
+
+	mkdir /debugfs
+	mount -t debugfs none /sys/kernel/debug
+	insmod /debugfs.ko
+	cd /debugfs/kernel_module_cheat
+	cat myfile
+
+Output:
+
+	42
+*/
+
+#include <linux/debugfs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+MODULE_LICENSE("GPL");
+
+static struct dentry *dir = 0;
+static u32 value = 42;
+
+int init_module(void)
+{
+    struct dentry *file;
+    dir = debugfs_create_dir("kernel_module_cheat", 0);
+    if (!dir) {
+        printk(KERN_ALERT "debugfs_create_dir failed");
+        return -1;
+    }
+    file = debugfs_create_u32("myfile", 0666, dir, &value);
+    if (!file) {
+        printk(KERN_ALERT "debugfs_create_u32 failed");
+        return -1;
+    }
+    return 0;
+}
+
+void cleanup_module(void)
+{
+    debugfs_remove_recursive(dir);
+}

kernel_module/package/kernel_module/src/hello.c

@@ -1,5 +1,11 @@
 /*
 Hello world module.
+
+	dmesg -c
+	insmod hello.ko
+	dmesg -c | grep 'hello init'
+	rmmod hello.ko
+	dmesg -c | grep 'hello cleanup'
 */
 
 #include <linux/module.h>