get rid of lkmc package, move userland and kernel-modules to top

Rationale: we already had a non buildroot build system,
maintaining both will be hard, and having short paths is more awesome.

kernel_modules/virt_to_phys.c

@@ -0,0 +1,66 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#virt_to_phys */
+
+#include <asm/io.h> /* virt_to_phys */
+#include <linux/debugfs.h>
+#include <linux/delay.h> /* usleep_range */
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/seq_file.h> /* single_open, single_release */
+#include <linux/slab.h> /* kmalloc, kfree */
+
+static volatile u32 *kmalloc_ptr;
+static volatile u32 static_var;
+
+static struct dentry *debugfs_file;
+
+static int show(struct seq_file *m, void *v)
+{
+	seq_printf(m,
+		"*kmalloc_ptr = 0x%llx\n"
+		"kmalloc_ptr = %px\n"
+		"virt_to_phys(kmalloc_ptr) = 0x%llx\n"
+		"static_var = 0x%llx\n"
+		"&static_var = %px\n"
+		"virt_to_phys(&static_var) = 0x%llx\n",
+		(unsigned long long)*kmalloc_ptr,
+		kmalloc_ptr,
+		(unsigned long long)virt_to_phys((void *)kmalloc_ptr),
+		(unsigned long long)static_var,
+		&static_var,
+		(unsigned long long)virt_to_phys((void *)&static_var)
+	);
+	return 0;
+}
+
+static int open(struct inode *inode, struct  file *file)
+{
+	return single_open(file, show, NULL);
+}
+
+static const struct file_operations fops = {
+	.llseek = seq_lseek,
+	.open = open,
+	.owner = THIS_MODULE,
+	.read = seq_read,
+	.release = single_release,
+};
+
+static int myinit(void)
+{
+	kmalloc_ptr = kmalloc(sizeof(kmalloc_ptr), GFP_KERNEL);
+	*kmalloc_ptr = 0x12345678;
+	static_var = 0x12345678;
+	debugfs_file = debugfs_create_file("lkmc_virt_to_phys", S_IRUSR, NULL, NULL, &fops);
+	return 0;
+}
+
+static void myexit(void)
+{
+	debugfs_remove(debugfs_file);
+	kfree((void *)kmalloc_ptr);
+}
+
+module_init(myinit)
+module_exit(myexit)
+MODULE_LICENSE("GPL");