schulung_tools: add klist kernel module

this module can be used to show the usage of klist

Signed-off-by: Manuel Traut <manut@linutronix.de>

1 files changed, 138 insertions, 0 deletions

diff --git a/schulung_tools/drivers/modules/klist/0001-klist-example.patch b/schulung_tools/drivers/modules/klist/0001-klist-example.patch
new file mode 100644
index 0000000..b52216a
--- /dev/null
+++ b/schulung_tools/drivers/modules/klist/0001-klist-example.patch
@@ -0,0 +1,138 @@
+From 504db8a2bae95d7bafb9b68074fdc46c49f08c9f Mon Sep 17 00:00:00 2001
+From: Manuel Traut <manut@linutronix.de>
+Date: Fri, 4 Jan 2019 09:32:18 +0100
+Subject: [PATCH] klist example
+
+this can be used to show the usage of klists
+
+Signed-off-by: Manuel Traut <manut@linutronix.de>
+---
+ drivers/staging/Kconfig         |  2 +
+ drivers/staging/Makefile        |  1 +
+ drivers/staging/klist/Kconfig  |  5 +++
+ drivers/staging/klist/Makefile |  1 +
+ drivers/staging/klist/klist.c | 68 +++++++++++++++++++++++++++++++++
+ 5 files changed, 77 insertions(+)
+ create mode 100644 drivers/staging/klist/Kconfig
+ create mode 100644 drivers/staging/klist/Makefile
+ create mode 100644 drivers/staging/klist/klist.c
+
+diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
+index bfa2bf720a03..98541d7a41be 100644
+--- a/drivers/staging/Kconfig
++++ b/drivers/staging/Kconfig
+@@ -24,6 +24,8 @@ menuconfig STAGING
+ 
+ if STAGING
+ 
++source "drivers/staging/klist/Kconfig"
++
+ source "drivers/staging/wlan-ng/Kconfig"
+ 
+ source "drivers/staging/comedi/Kconfig"
+diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
+index 25b3a8eafaa1..7a6d82750008 100644
+--- a/drivers/staging/Makefile
++++ b/drivers/staging/Makefile
+@@ -2,6 +2,7 @@
+ # Makefile for staging directory
+ 
+ obj-y				+= media/
++obj-$(CONFIG_KLISTEXAMPLE)		+= klist/
+ obj-$(CONFIG_PRISM2_USB)	+= wlan-ng/
+ obj-$(CONFIG_COMEDI)		+= comedi/
+ obj-$(CONFIG_FB_OLPC_DCON)	+= olpc_dcon/
+diff --git a/drivers/staging/klist/Kconfig b/drivers/staging/klist/Kconfig
+new file mode 100644
+index 000000000000..18f517e56cb9
+--- /dev/null
++++ b/drivers/staging/klist/Kconfig
+@@ -0,0 +1,4 @@
++config KLISTEXAMPLE
++	tristate "module to teach klist usage"
++	---help---
++	  This is only useful for learning the usage of klist.
+diff --git a/drivers/staging/klist/Makefile b/drivers/staging/klist/Makefile
+new file mode 100644
+index 000000000000..2939c11d72ff
+--- /dev/null
++++ b/drivers/staging/klist/Makefile
+@@ -0,0 +1 @@
++obj-$(CONFIG_KLISTEXAMPLE)		+= klist.o
+diff --git a/drivers/staging/klist/klist.c b/drivers/staging/klist/klist.c
+new file mode 100644
+index 000000000000..365acaa3263a
+--- /dev/null
++++ b/drivers/staging/klist/klist.c
+@@ -0,0 +1,68 @@
++/*
++ * Example driver for using klist
++ * Copyright (C) 2019, Manuel Traut <manut@linutronix.de>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version
++ * 2 of the License, or (at your option) any later version.
++ */
++
++#include <linux/module.h>
++#include <linux/errno.h>
++#include <linux/list.h>
++#include <linux/slab.h>
++
++#define DRV_NAME "klist"
++
++struct mynode {
++	struct list_head node;
++	unsigned long val;
++};
++
++static struct list_head mylist;
++static char mystring[] = "1 2 3 4 5\n";
++
++static void klist_free_list(void) {
++	struct mynode *n, *tmp;
++	list_for_each_entry_safe(n, tmp, &mylist, node)
++		kfree(n);
++}
++
++static void klist_init_list(void) {
++	unsigned long val;
++	struct mynode *n;
++	char *tok;
++	char *b = kstrdup(mystring, GFP_KERNEL);
++
++	INIT_LIST_HEAD(&mylist);
++
++	while ((tok = strsep(&b, " ")) && *tok) {
++		printk(KERN_INFO "adding %s to list\n", tok);
++		if (kstrtoul(tok, 0, &val)) {
++			printk(KERN_ERR "failed to convert %s to int\n", tok);
++			goto exit_init;
++		}
++		n = kzalloc(sizeof(*n), GFP_KERNEL);
++		n->val = val;
++		list_add_tail(&n->node, &mylist);
++	}
++exit_init:
++	kfree(b);
++}
++
++static int __init klist_init(void) {
++	printk(KERN_INFO "%s\n", __func__);
++	klist_init_list();
++	return 0;
++}
++
++static void __exit klist_exit(void) {
++	printk(KERN_INFO "%s\n", __func__);
++	klist_free_list();
++}
++
++module_init(klist_init);
++module_exit(klist_exit);
++MODULE_AUTHOR("Manuel Traut");
++MODULE_LICENSE("GPL");
+-- 
+2.19.2
+