waitqueue example works, kthread_uniterruptible completely wrong and renamed to schedule, params added

kernel_module/params.c

@@ -0,0 +1,51 @@
+/*
+Allows passing parameters at insertion time.
+
+Those parameters can also be read and modified at runtime from /sys.
+
+	insmod /params.ko
+	# dmesg => 0
+	cd /sys/module/params/parameters
+	cat i
+	# => 0
+	printf 1 >i
+	# dmesg => 1
+	rmmod params
+	insmod /params.ko i=1
+	# dmesg => 1
+*/
+
+#include <linux/delay.h> /* usleep_range */
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <uapi/linux/stat.h> /* S_IRUSR | S_IWUSR */
+
+MODULE_LICENSE("GPL");
+
+static int i = 0;
+module_param(i, int, S_IRUSR | S_IWUSR);
+MODULE_PARM_DESC(i, "my favorite int");
+
+static struct task_struct *kthread;
+
+static int work_func(void *data)
+{
+	while (!kthread_should_stop()) {
+		pr_info("%d\n", i);
+		usleep_range(1000000, 1000001);
+	}
+	return 0;
+}
+
+int init_module(void)
+{
+	kthread = kthread_create(work_func, NULL, "mykthread");
+	wake_up_process(kthread);
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	kthread_stop(kthread);
+}