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/kstrto.c

@@ -0,0 +1,65 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#kstrto */
+
+#include <linux/debugfs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
+#include <uapi/linux/stat.h> /* S_IWUSR */
+
+static struct dentry *toplevel_file;
+static char read_buf[1024];
+
+static int show(struct seq_file *m, void *v)
+{
+	seq_printf(m, read_buf);
+	return 0;
+}
+
+static int open(struct inode *inode, struct file *file)
+{
+	return single_open(file, show, NULL);
+}
+
+static ssize_t write(struct file *filp, const char __user *buf, size_t len, loff_t *off)
+{
+	ssize_t ret;
+	int kstrto_return;
+	unsigned long long kstrto_result;
+	kstrto_return = kstrtoull_from_user(buf, len, 10, &kstrto_result);
+	if (kstrto_return) {
+		/* Negative error code. */
+		ret = kstrto_return;
+	} else {
+		ret = len;
+	}
+	snprintf(read_buf, sizeof(read_buf), "%llu", kstrto_result + 1);
+	return ret;
+}
+
+static const struct file_operations fops = {
+	.llseek = seq_lseek,
+	.open = open,
+	.owner = THIS_MODULE,
+	.read = seq_read,
+	.release = single_release,
+	.write = write,
+};
+
+static int myinit(void)
+{
+	toplevel_file = debugfs_create_file("lkmc_kstrto", S_IWUSR, NULL, NULL, &fops);
+	if (!toplevel_file) {
+		return -1;
+	}
+	return 0;
+}
+
+static void myexit(void)
+{
+	debugfs_remove(toplevel_file);
+}
+
+module_init(myinit)
+module_exit(myexit)
+MODULE_LICENSE("GPL");