diff --git a/books/kernel-sample/sample/connector/Makefile b/books/kernel-sample/sample/connector/Makefile
new file mode 100644
index 0000000..3faaa46
--- /dev/null
+++ b/books/kernel-sample/sample/connector/Makefile
@@ -0,0 +1,78 @@
+# ------------------------------------------------------------------------------
+#
+# Makefile for the LDD-LinuxDeviceDrivers.
+#
+# Author: gatieme
+# Create: 2016-07-29 15:50:46
+# Last modified: 2016-07-29 16:10:29
+# Description:
+# 	This program is loaded as a kernel(v2.6.18 or later) module.
+# 	Use "make install" to load it into kernel.
+# 	Use "make remove" to remove the module out of kernel.
+#
+# ------------------------------------------------------------------------------
+
+
+#	my driver description
+DRIVER_VERSION := "1.0.0"
+DRIVER_AUTHOR  := "Gatieme @ AderStep Inc..."
+DRIVER_DESC    := "Linux input module for Elo MultiTouch(MT) devices"
+DRIVER_LICENSE := "Dual BSD/GPL"
+
+
+MODULE_NAME := cn_test
+
+#CFG_FLAGS += -O2  -I./
+#EXTRA_CFLAGS  += $(C_FLAGS) $(CFG_INC) $(CFG_INC)
+MODCFLAGS:=-O6 -Wall -DMODULE -D__KERNEL__ -DLINUX -I$(PWD) -std=c99
+
+
+
+ifneq ($(KERNELRELEASE),)
+
+
+
+
+obj-m := $(MODULE_NAME).o #print_vmarea.o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+modules:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+modules_install:
+	make -C $(KERNELDIR) M=$(PWD) modules_install
+
+
+
+insmod:
+	sudo insmod $(MODULE_NAME).ko
+
+reinsmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo insmod $(MODULE_NAME).ko
+
+github:
+	cd $(ROOT) && make github
+
+rmmod:
+	sudo rmmod $(MODULE_NAME)
+
+test :
+	sudo ../injector/memInjector -l stack -m random -t word_0 --time 1 --timeout 3 -p 1
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+	rm -f modules.order Module.symvers Module.markers
+
+.PHNOY:
+	modules modules_install clean
+
+
+
+endif
+
diff --git a/books/kernel-sample/sample/connector/cn_test.c b/books/kernel-sample/sample/connector/cn_test.c
new file mode 100644
index 0000000..126041b
--- /dev/null
+++ b/books/kernel-sample/sample/connector/cn_test.c
@@ -0,0 +1,201 @@
+/*
+ *      cn_test.c
+ *
+ * 2004+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#define pr_fmt(fmt) "cn_test: " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+
+#include <linux/connector.h>
+
+static struct cb_id cn_test_id = { CN_NETLINK_USERS + 3, 0x456 };
+static char cn_test_name[] = "cn_test";
+static struct sock *nls;
+static struct timer_list cn_test_timer;
+
+static void cn_test_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
+{
+        pr_info("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n",
+                __func__, jiffies, msg->id.idx, msg->id.val,
+                msg->seq, msg->ack, msg->len,
+                msg->len ? (char *)msg->data : "");
+}
+
+/*
+ * Do not remove this function even if no one is using it as
+ * this is an example of how to get notifications about new
+ * connector user registration
+ */
+#if 0
+static int cn_test_want_notify(void)
+{
+        struct cn_ctl_msg *ctl;
+        struct cn_notify_req *req;
+        struct cn_msg *msg = NULL;
+        int size, size0;
+        struct sk_buff *skb;
+        struct nlmsghdr *nlh;
+        u32 group = 1;
+
+        size0 = sizeof(*msg) + sizeof(*ctl) + 3 * sizeof(*req);
+
+        size = NLMSG_SPACE(size0);
+
+        skb = alloc_skb(size, GFP_ATOMIC);
+        if (!skb) {
+                pr_err("failed to allocate new skb with size=%u\n", size);
+                return -ENOMEM;
+        }
+
+        nlh = nlmsg_put(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh), 0);
+        if (!nlh) {
+                kfree_skb(skb);
+                return -EMSGSIZE;
+        }
+
+        msg = nlmsg_data(nlh);
+
+        memset(msg, 0, size0);
+
+        msg->id.idx = -1;
+        msg->id.val = -1;
+        msg->seq = 0x123;
+        msg->ack = 0x345;
+        msg->len = size0 - sizeof(*msg);
+
+        ctl = (struct cn_ctl_msg *)(msg + 1);
+
+        ctl->idx_notify_num = 1;
+        ctl->val_notify_num = 2;
+        ctl->group = group;
+        ctl->len = msg->len - sizeof(*ctl);
+
+        req = (struct cn_notify_req *)(ctl + 1);
+
+        /*
+         * Idx.
+         */
+        req->first = cn_test_id.idx;
+        req->range = 10;
+
+        /*
+         * Val 0.
+         */
+        req++;
+        req->first = cn_test_id.val;
+        req->range = 10;
+
+        /*
+         * Val 1.
+         */
+        req++;
+        req->first = cn_test_id.val + 20;
+        req->range = 10;
+
+        NETLINK_CB(skb).dst_group = ctl->group;
+        //netlink_broadcast(nls, skb, 0, ctl->group, GFP_ATOMIC);
+        netlink_unicast(nls, skb, 0, 0);
+
+        pr_info("request was sent: group=0x%x\n", ctl->group);
+
+        return 0;
+}
+#endif
+
+static u32 cn_test_timer_counter;
+static void cn_test_timer_func(unsigned long __data)
+{
+        struct cn_msg *m;
+        char data[32];
+
+        pr_debug("%s: timer fired with data %lu\n", __func__, __data);
+
+        m = kzalloc(sizeof(*m) + sizeof(data), GFP_ATOMIC);
+        if (m) {
+
+                memcpy(&m->id, &cn_test_id, sizeof(m->id));
+                m->seq = cn_test_timer_counter;
+                m->len = sizeof(data);
+
+                m->len =
+                    scnprintf(data, sizeof(data), "counter = %u",
+                              cn_test_timer_counter) + 1;
+
+                memcpy(m + 1, data, m->len);
+
+                cn_netlink_send(m, 0, GFP_ATOMIC);
+                kfree(m);
+        }
+
+        cn_test_timer_counter++;
+
+        mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
+}
+
+static int cn_test_init(void)
+{
+        int err;
+
+        err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
+        if (err)
+                goto err_out;
+        cn_test_id.val++;
+        err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
+        if (err) {
+                cn_del_callback(&cn_test_id);
+                goto err_out;
+        }
+
+        setup_timer(&cn_test_timer, cn_test_timer_func, 0);
+        mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
+
+        pr_info("initialized with id={%u.%u}\n",
+                cn_test_id.idx, cn_test_id.val);
+
+        return 0;
+
+      err_out:
+        if (nls && nls->sk_socket)
+                sock_release(nls->sk_socket);
+
+        return err;
+}
+
+static void cn_test_fini(void)
+{
+        del_timer_sync(&cn_test_timer);
+        cn_del_callback(&cn_test_id);
+        cn_test_id.val--;
+        cn_del_callback(&cn_test_id);
+        if (nls && nls->sk_socket)
+                sock_release(nls->sk_socket);
+}
+
+module_init(cn_test_init);
+module_exit(cn_test_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
+MODULE_DESCRIPTION("Connector's test module");
diff --git a/books/kernel-sample/sample/connector/ucon.c b/books/kernel-sample/sample/connector/ucon.c
new file mode 100644
index 0000000..1eb789f
--- /dev/null
+++ b/books/kernel-sample/sample/connector/ucon.c
@@ -0,0 +1,250 @@
+/*
+ *      ucon.c
+ *
+ * Copyright (c) 2004+ Evgeniy Polyakov <zbr@ioremap.net>
+ *
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <asm/types.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/poll.h>
+
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <arpa/inet.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <getopt.h>
+
+#include <linux/connector.h>
+
+#define DEBUG
+#define NETLINK_CONNECTOR       11
+
+/* Hopefully your userspace connector.h matches this kernel */
+#define CN_TEST_IDX             CN_NETLINK_USERS + 3
+#define CN_TEST_VAL             0x456
+
+#ifdef DEBUG
+#define ulog(f, a...) fprintf(stdout, f, ##a)
+#else
+#define ulog(f, a...) do {} while (0)
+#endif
+
+static int need_exit;
+static __u32 seq;
+
+static int netlink_send(int s, struct cn_msg *msg)
+{
+        struct nlmsghdr *nlh;
+        unsigned int size;
+        int err;
+        char buf[128];
+        struct cn_msg *m;
+
+        size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
+
+        nlh = (struct nlmsghdr *)buf;
+        nlh->nlmsg_seq = seq++;
+        nlh->nlmsg_pid = getpid();
+        nlh->nlmsg_type = NLMSG_DONE;
+        nlh->nlmsg_len = size;
+        nlh->nlmsg_flags = 0;
+
+        m = NLMSG_DATA(nlh);
+#if 0
+        ulog("%s: [%08x.%08x] len=%u, seq=%u, ack=%u.\n",
+               __func__, msg->id.idx, msg->id.val, msg->len, msg->seq, msg->ack);
+#endif
+        memcpy(m, msg, sizeof(*m) + msg->len);
+
+        err = send(s, nlh, size, 0);
+        if (err == -1)
+                ulog("Failed to send: %s [%d].\n",
+                        strerror(errno), errno);
+
+        return err;
+}
+
+static void usage(void)
+{
+        printf(
+                "Usage: ucon [options] [output file]\n"
+                "\n"
+                "\t-h\tthis help screen\n"
+                "\t-s\tsend buffers to the test module\n"
+                "\n"
+                "The default behavior of ucon is to subscribe to the test module\n"
+                "and wait for state messages.  Any ones received are dumped to the\n"
+                "specified output file (or stdout).  The test module is assumed to\n"
+                "have an id of {%u.%u}\n"
+                "\n"
+                "If you get no output, then verify the cn_test module id matches\n"
+                "the expected id above.\n"
+                , CN_TEST_IDX, CN_TEST_VAL
+        );
+}
+
+int main(int argc, char *argv[])
+{
+        int s;
+        char buf[1024];
+        int len;
+        struct nlmsghdr *reply;
+        struct sockaddr_nl l_local;
+        struct cn_msg *data;
+        FILE *out;
+        time_t tm;
+        struct pollfd pfd;
+        bool send_msgs = false;
+
+        while ((s = getopt(argc, argv, "hs")) != -1) {
+                switch (s) {
+                case 's':
+                        send_msgs = true;
+                        break;
+
+                case 'h':
+                        usage();
+                        return 0;
+
+                default:
+                        /* getopt() outputs an error for us */
+                        usage();
+                        return 1;
+                }
+        }
+
+        if (argc != optind) {
+                out = fopen(argv[optind], "a+");
+                if (!out) {
+                        ulog("Unable to open %s for writing: %s\n",
+                                argv[1], strerror(errno));
+                        out = stdout;
+                }
+        } else
+                out = stdout;
+
+        memset(buf, 0, sizeof(buf));
+
+        s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
+        if (s == -1) {
+                perror("socket");
+                return -1;
+        }
+
+        l_local.nl_family = AF_NETLINK;
+        l_local.nl_groups = -1; /* bitmask of requested groups */
+        l_local.nl_pid = 0;
+
+        ulog("subscribing to %u.%u\n", CN_TEST_IDX, CN_TEST_VAL);
+
+        if (bind(s, (struct sockaddr *)&l_local, sizeof(struct sockaddr_nl)) == -1) {
+                perror("bind");
+                close(s);
+                return -1;
+        }
+
+#if 0
+        {
+                int on = 0x57; /* Additional group number */
+                setsockopt(s, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &on, sizeof(on));
+        }
+#endif
+        if (send_msgs) {
+                int i, j;
+
+                memset(buf, 0, sizeof(buf));
+
+                data = (struct cn_msg *)buf;
+
+                data->id.idx = CN_TEST_IDX;
+                data->id.val = CN_TEST_VAL;
+                data->seq = seq++;
+                data->ack = 0;
+                data->len = 0;
+
+                for (j=0; j<10; ++j) {
+                        for (i=0; i<1000; ++i) {
+                                len = netlink_send(s, data);
+                        }
+
+                        ulog("%d messages have been sent to %08x.%08x.\n", i, data->id.idx, data->id.val);
+                }
+
+                return 0;
+        }
+
+
+        pfd.fd = s;
+
+        while (!need_exit) {
+                pfd.events = POLLIN;
+                pfd.revents = 0;
+                switch (poll(&pfd, 1, -1)) {
+                        case 0:
+                                need_exit = 1;
+                                break;
+                        case -1:
+                                if (errno != EINTR) {
+                                        need_exit = 1;
+                                        break;
+                                }
+                                continue;
+                }
+                if (need_exit)
+                        break;
+
+                memset(buf, 0, sizeof(buf));
+                len = recv(s, buf, sizeof(buf), 0);
+                if (len == -1) {
+                        perror("recv buf");
+                        close(s);
+                        return -1;
+                }
+                reply = (struct nlmsghdr *)buf;
+
+                switch (reply->nlmsg_type) {
+                case NLMSG_ERROR:
+                        fprintf(out, "Error message received.\n");
+                        fflush(out);
+                        break;
+                case NLMSG_DONE:
+                        data = (struct cn_msg *)NLMSG_DATA(reply);
+
+                        time(&tm);
+                        fprintf(out, "%.24s : [%x.%x] [%08u.%08u].\n",
+                                ctime(&tm), data->id.idx, data->id.val, data->seq, data->ack);
+                        fflush(out);
+                        break;
+                default:
+                        break;
+                }
+        }
+
+        close(s);
+        return 0;
+}
diff --git a/books/kernel-sample/sample/kdb/Makefile b/books/kernel-sample/sample/kdb/Makefile
new file mode 100644
index 0000000..d7ed25e
--- /dev/null
+++ b/books/kernel-sample/sample/kdb/Makefile
@@ -0,0 +1,78 @@
+# ------------------------------------------------------------------------------
+#
+# Makefile for the LDD-LinuxDeviceDrivers.
+#
+# Author: gatieme
+# Create: 2016-07-29 15:50:46
+# Last modified: 2016-07-29 16:10:29
+# Description:
+# 	This program is loaded as a kernel(v2.6.18 or later) module.
+# 	Use "make install" to load it into kernel.
+# 	Use "make remove" to remove the module out of kernel.
+#
+# ------------------------------------------------------------------------------
+
+
+#	my driver description
+DRIVER_VERSION := "1.0.0"
+DRIVER_AUTHOR  := "Gatieme @ AderStep Inc..."
+DRIVER_DESC    := "Linux input module for Elo MultiTouch(MT) devices"
+DRIVER_LICENSE := "Dual BSD/GPL"
+
+
+MODULE_NAME := kdb_hello
+
+#CFG_FLAGS += -O2  -I./
+#EXTRA_CFLAGS  += $(C_FLAGS) $(CFG_INC) $(CFG_INC)
+MODCFLAGS:=-O6 -Wall -DMODULE -D__KERNEL__ -DLINUX -I$(PWD) -std=c99
+
+
+
+ifneq ($(KERNELRELEASE),)
+
+
+
+
+obj-m := $(MODULE_NAME).o #print_vmarea.o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+modules:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+modules_install:
+	make -C $(KERNELDIR) M=$(PWD) modules_install
+
+
+
+insmod:
+	sudo insmod $(MODULE_NAME).ko
+
+reinsmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo insmod $(MODULE_NAME).ko
+
+github:
+	cd $(ROOT) && make github
+
+rmmod:
+	sudo rmmod $(MODULE_NAME)
+
+test :
+	sudo ../injector/memInjector -l stack -m random -t word_0 --time 1 --timeout 3 -p 1
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+	rm -f modules.order Module.symvers Module.markers
+
+.PHNOY:
+	modules modules_install clean
+
+
+
+endif
+
diff --git a/books/kernel-sample/sample/kdb/kdb_hello.c b/books/kernel-sample/sample/kdb/kdb_hello.c
new file mode 100644
index 0000000..5b7c99b
--- /dev/null
+++ b/books/kernel-sample/sample/kdb/kdb_hello.c
@@ -0,0 +1,60 @@
+/*
+ * Created by: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (c) 2010 Wind River Systems, Inc.  All Rights Reserved.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/kdb.h>
+
+/*
+ * All kdb shell command call backs receive argc and argv, where
+ * argv[0] is the command the end user typed
+ */
+static int kdb_hello_cmd(int argc, const char **argv)
+{
+        if (argc > 1)
+                return KDB_ARGCOUNT;
+
+        if (argc)
+                kdb_printf("Hello %s.\n", argv[1]);
+        else
+                kdb_printf("Hello world!\n");
+
+        return 0;
+}
+
+
+static int __init kdb_hello_cmd_init(void)
+{
+        /*
+         * Registration of a dynamically added kdb command is done with
+         * kdb_register() with the arguments being:
+         *   1: The name of the shell command
+         *   2: The function that processes the command
+         *   3: Description of the usage of any arguments
+         *   4: Descriptive text when you run help
+         *   5: Number of characters to complete the command
+         *      0 == type the whole command
+         *      1 == match both "g" and "go" for example
+         */
+        kdb_register("hello", kdb_hello_cmd, "[string]",
+                     "Say Hello World or Hello [string]", 0);
+        return 0;
+}
+
+static void __exit kdb_hello_cmd_exit(void)
+{
+        kdb_unregister("hello");
+}
+
+module_init(kdb_hello_cmd_init);
+module_exit(kdb_hello_cmd_exit);
+
+MODULE_AUTHOR("WindRiver");
+MODULE_DESCRIPTION("KDB example to add a hello command");
+MODULE_LICENSE("GPL");
diff --git a/books/kernel-sample/sample/trace_events/Makefile b/books/kernel-sample/sample/trace_events/Makefile
new file mode 100644
index 0000000..1a6b493
--- /dev/null
+++ b/books/kernel-sample/sample/trace_events/Makefile
@@ -0,0 +1,78 @@
+# ------------------------------------------------------------------------------
+#
+# Makefile for the LDD-LinuxDeviceDrivers.
+#
+# Author: gatieme
+# Create: 2016-07-29 15:50:46
+# Last modified: 2016-07-29 16:10:29
+# Description:
+# 	This program is loaded as a kernel(v2.6.18 or later) module.
+# 	Use "make install" to load it into kernel.
+# 	Use "make remove" to remove the module out of kernel.
+#
+# ------------------------------------------------------------------------------
+
+
+#	my driver description
+DRIVER_VERSION := "1.0.0"
+DRIVER_AUTHOR  := "Gatieme @ AderStep Inc..."
+DRIVER_DESC    := "Linux input module for Elo MultiTouch(MT) devices"
+DRIVER_LICENSE := "Dual BSD/GPL"
+
+
+MODULE_NAME := trace-events-sample
+
+#CFG_FLAGS += -O2  -I./
+#EXTRA_CFLAGS  += $(C_FLAGS) $(CFG_INC) $(CFG_INC)
+MODCFLAGS:=-O6 -Wall -DMODULE -D__KERNEL__ -DLINUX -I$(PWD) -std=c99
+
+
+
+ifneq ($(KERNELRELEASE),)
+
+
+
+
+obj-m := $(MODULE_NAME).o #print_vmarea.o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+modules:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+modules_install:
+	make -C $(KERNELDIR) M=$(PWD) modules_install
+
+
+
+insmod:
+	sudo insmod $(MODULE_NAME).ko
+
+reinsmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo insmod $(MODULE_NAME).ko
+
+github:
+	cd $(ROOT) && make github
+
+rmmod:
+	sudo rmmod $(MODULE_NAME)
+
+test :
+	sudo ../injector/memInjector -l stack -m random -t word_0 --time 1 --timeout 3 -p 1
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+	rm -f modules.order Module.symvers Module.markers
+
+.PHNOY:
+	modules modules_install clean
+
+
+
+endif
+
diff --git a/books/kernel-sample/sample/trace_events/trace-events-sample.c b/books/kernel-sample/sample/trace_events/trace-events-sample.c
new file mode 100644
index 0000000..81d2d46
--- /dev/null
+++ b/books/kernel-sample/sample/trace_events/trace-events-sample.c
@@ -0,0 +1,131 @@
+#include <linux/module.h>
+#include <linux/kthread.h>
+
+/*
+ * Any file that uses trace points, must include the header.
+ * But only one file, must include the header by defining
+ * CREATE_TRACE_POINTS first.  This will make the C code that
+ * creates the handles for the trace points.
+ */
+#define CREATE_TRACE_POINTS
+#include "trace-events-sample.h"
+
+static const char *random_strings[] = {
+        "Mother Goose",
+        "Snoopy",
+        "Gandalf",
+        "Frodo",
+        "One ring to rule them all"
+};
+
+static void simple_thread_func(int cnt)
+{
+        int array[6];
+        int len = cnt % 5;
+        int i;
+
+        set_current_state(TASK_INTERRUPTIBLE);
+        schedule_timeout(HZ);
+
+        for (i = 0; i < len; i++)
+                array[i] = i + 1;
+        array[i] = 0;
+
+        /* Silly tracepoints */
+        trace_foo_bar("hello", cnt, array, random_strings[len],
+                      tsk_cpus_allowed(current));
+
+        trace_foo_with_template_simple("HELLO", cnt);
+
+        trace_foo_bar_with_cond("Some times print", cnt);
+
+        trace_foo_with_template_cond("prints other times", cnt);
+
+        trace_foo_with_template_print("I have to be different", cnt);
+}
+
+static int simple_thread(void *arg)
+{
+        int cnt = 0;
+
+        while (!kthread_should_stop())
+                simple_thread_func(cnt++);
+
+        return 0;
+}
+
+static struct task_struct *simple_tsk;
+static struct task_struct *simple_tsk_fn;
+
+static void simple_thread_func_fn(int cnt)
+{
+        set_current_state(TASK_INTERRUPTIBLE);
+        schedule_timeout(HZ);
+
+        /* More silly tracepoints */
+        trace_foo_bar_with_fn("Look at me", cnt);
+        trace_foo_with_template_fn("Look at me too", cnt);
+}
+
+static int simple_thread_fn(void *arg)
+{
+        int cnt = 0;
+
+        while (!kthread_should_stop())
+                simple_thread_func_fn(cnt++);
+
+        return 0;
+}
+
+static DEFINE_MUTEX(thread_mutex);
+
+int foo_bar_reg(void)
+{
+        pr_info("Starting thread for foo_bar_fn\n");
+        /*
+         * We shouldn't be able to start a trace when the module is
+         * unloading (there's other locks to prevent that). But
+         * for consistency sake, we still take the thread_mutex.
+         */
+        mutex_lock(&thread_mutex);
+        simple_tsk_fn = kthread_run(simple_thread_fn, NULL, "event-sample-fn");
+        mutex_unlock(&thread_mutex);
+        return 0;
+}
+
+void foo_bar_unreg(void)
+{
+        pr_info("Killing thread for foo_bar_fn\n");
+        /* protect against module unloading */
+        mutex_lock(&thread_mutex);
+        if (simple_tsk_fn)
+                kthread_stop(simple_tsk_fn);
+        simple_tsk_fn = NULL;
+        mutex_unlock(&thread_mutex);
+}
+
+static int __init trace_event_init(void)
+{
+        simple_tsk = kthread_run(simple_thread, NULL, "event-sample");
+        if (IS_ERR(simple_tsk))
+                return -1;
+
+        return 0;
+}
+
+static void __exit trace_event_exit(void)
+{
+        kthread_stop(simple_tsk);
+        mutex_lock(&thread_mutex);
+        if (simple_tsk_fn)
+                kthread_stop(simple_tsk_fn);
+        simple_tsk_fn = NULL;
+        mutex_unlock(&thread_mutex);
+}
+
+module_init(trace_event_init);
+module_exit(trace_event_exit);
+
+MODULE_AUTHOR("Steven Rostedt");
+MODULE_DESCRIPTION("trace-events-sample");
+MODULE_LICENSE("GPL");
diff --git a/books/kernel-sample/sample/trace_events/trace-events-sample.h b/books/kernel-sample/sample/trace_events/trace-events-sample.h
new file mode 100644
index 0000000..d1269f5
--- /dev/null
+++ b/books/kernel-sample/sample/trace_events/trace-events-sample.h
@@ -0,0 +1,523 @@
+/*
+ * If TRACE_SYSTEM is defined, that will be the directory created
+ * in the ftrace directory under /sys/kernel/tracing/events/<system>
+ *
+ * The define_trace.h below will also look for a file name of
+ * TRACE_SYSTEM.h where TRACE_SYSTEM is what is defined here.
+ * In this case, it would look for sample-trace.h
+ *
+ * If the header name will be different than the system name
+ * (as in this case), then you can override the header name that
+ * define_trace.h will look up by defining TRACE_INCLUDE_FILE
+ *
+ * This file is called trace-events-sample.h but we want the system
+ * to be called "sample-trace". Therefore we must define the name of this
+ * file:
+ *
+ * #define TRACE_INCLUDE_FILE trace-events-sample
+ *
+ * As we do an the bottom of this file.
+ *
+ * Notice that TRACE_SYSTEM should be defined outside of #if
+ * protection, just like TRACE_INCLUDE_FILE.
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM sample-trace
+
+/*
+ * TRACE_SYSTEM is expected to be a C valid variable (alpha-numeric
+ * and underscore), although it may start with numbers. If for some
+ * reason it is not, you need to add the following lines:
+ */
+#undef TRACE_SYSTEM_VAR
+#define TRACE_SYSTEM_VAR sample_trace
+/*
+ * But the above is only needed if TRACE_SYSTEM is not alpha-numeric
+ * and underscored. By default, TRACE_SYSTEM_VAR will be equal to
+ * TRACE_SYSTEM. As TRACE_SYSTEM_VAR must be alpha-numeric, if
+ * TRACE_SYSTEM is not, then TRACE_SYSTEM_VAR must be defined with
+ * only alpha-numeric and underscores.
+ *
+ * The TRACE_SYSTEM_VAR is only used internally and not visible to
+ * user space.
+ */
+
+/*
+ * Notice that this file is not protected like a normal header.
+ * We also must allow for rereading of this file. The
+ *
+ *  || defined(TRACE_HEADER_MULTI_READ)
+ *
+ * serves this purpose.
+ */
+#if !defined(_TRACE_EVENT_SAMPLE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_EVENT_SAMPLE_H
+
+/*
+ * All trace headers should include tracepoint.h, until we finally
+ * make it into a standard header.
+ */
+#include <linux/tracepoint.h>
+
+/*
+ * The TRACE_EVENT macro is broken up into 5 parts.
+ *
+ * name: name of the trace point. This is also how to enable the tracepoint.
+ *   A function called trace_foo_bar() will be created.
+ *
+ * proto: the prototype of the function trace_foo_bar()
+ *   Here it is trace_foo_bar(char *foo, int bar).
+ *
+ * args:  must match the arguments in the prototype.
+ *    Here it is simply "foo, bar".
+ *
+ * struct:  This defines the way the data will be stored in the ring buffer.
+ *          The items declared here become part of a special structure
+ *          called "__entry", which can be used in the fast_assign part of the
+ *          TRACE_EVENT macro.
+ *
+ *      Here are the currently defined types you can use:
+ *
+ *   __field : Is broken up into type and name. Where type can be any
+ *         primitive type (integer, long or pointer).
+ *
+ *        __field(int, foo)
+ *
+ *        __entry->foo = 5;
+ *
+ *   __field_struct : This can be any static complex data type (struct, union
+ *         but not an array). Be careful using complex types, as each
+ *         event is limited in size, and copying large amounts of data
+ *         into the ring buffer can slow things down.
+ *
+ *         __field_struct(struct bar, foo)
+ *
+ *         __entry->bar.x = y;
+
+ *   __array: There are three fields (type, name, size). The type is the
+ *         type of elements in teh array, the name is the name of the array.
+ *         size is the number of items in the array (not the total size).
+ *
+ *         __array( char, foo, 10) is the same as saying: char foo[10];
+ *
+ *         Assigning arrays can be done like any array:
+ *
+ *         __entry->foo[0] = 'a';
+ *
+ *         memcpy(__entry->foo, bar, 10);
+ *
+ *   __dynamic_array: This is similar to array, but can vary its size from
+ *         instance to instance of the tracepoint being called.
+ *         Like __array, this too has three elements (type, name, size);
+ *         type is the type of the element, name is the name of the array.
+ *         The size is different than __array. It is not a static number,
+ *         but the algorithm to figure out the length of the array for the
+ *         specific instance of tracepoint. Again, size is the numebr of
+ *         items in the array, not the total length in bytes.
+ *
+ *         __dynamic_array( int, foo, bar) is similar to: int foo[bar];
+ *
+ *         Note, unlike arrays, you must use the __get_dynamic_array() macro
+ *         to access the array.
+ *
+ *         memcpy(__get_dynamic_array(foo), bar, 10);
+ *
+ *         Notice, that "__entry" is not needed here.
+ *
+ *   __string: This is a special kind of __dynamic_array. It expects to
+ *         have a nul terminated character array passed to it (it allows
+ *         for NULL too, which would be converted into "(null)"). __string
+ *         takes two paramenter (name, src), where name is the name of
+ *         the string saved, and src is the string to copy into the
+ *         ring buffer.
+ *
+ *         __string(foo, bar)  is similar to:  strcpy(foo, bar)
+ *
+ *         To assign a string, use the helper macro __assign_str().
+ *
+ *         __assign_str(foo, bar);
+ *
+ *         In most cases, the __assign_str() macro will take the same
+ *         parameters as the __string() macro had to declare the string.
+ *
+ *   __bitmask: This is another kind of __dynamic_array, but it expects
+ *         an array of longs, and the number of bits to parse. It takes
+ *         two parameters (name, nr_bits), where name is the name of the
+ *         bitmask to save, and the nr_bits is the number of bits to record.
+ *
+ *         __bitmask(target_cpu, nr_cpumask_bits)
+ *
+ *         To assign a bitmask, use the __assign_bitmask() helper macro.
+ *
+ *         __assign_bitmask(target_cpus, cpumask_bits(bar), nr_cpumask_bits);
+ *
+ *
+ * fast_assign: This is a C like function that is used to store the items
+ *    into the ring buffer. A special variable called "__entry" will be the
+ *    structure that points into the ring buffer and has the same fields as
+ *    described by the struct part of TRACE_EVENT above.
+ *
+ * printk: This is a way to print out the data in pretty print. This is
+ *    useful if the system crashes and you are logging via a serial line,
+ *    the data can be printed to the console using this "printk" method.
+ *    This is also used to print out the data from the trace files.
+ *    Again, the __entry macro is used to access the data from the ring buffer.
+ *
+ *    Note, __dynamic_array, __string, and __bitmask require special helpers
+ *       to access the data.
+ *
+ *      For __dynamic_array(int, foo, bar) use __get_dynamic_array(foo)
+ *            Use __get_dynamic_array_len(foo) to get the length of the array
+ *            saved. Note, __get_dynamic_array_len() returns the total allocated
+ *            length of the dynamic array; __print_array() expects the second
+ *            parameter to be the number of elements. To get that, the array length
+ *            needs to be divided by the element size.
+ *
+ *      For __string(foo, bar) use __get_str(foo)
+ *
+ *      For __bitmask(target_cpus, nr_cpumask_bits) use __get_bitmask(target_cpus)
+ *
+ *
+ * Note, that for both the assign and the printk, __entry is the handler
+ * to the data structure in the ring buffer, and is defined by the
+ * TP_STRUCT__entry.
+ */
+
+/*
+ * It is OK to have helper functions in the file, but they need to be protected
+ * from being defined more than once. Remember, this file gets included more
+ * than once.
+ */
+#ifndef __TRACE_EVENT_SAMPLE_HELPER_FUNCTIONS
+#define __TRACE_EVENT_SAMPLE_HELPER_FUNCTIONS
+static inline int __length_of(const int *list)
+{
+        int i;
+
+        if (!list)
+                return 0;
+
+        for (i = 0; list[i]; i++)
+                ;
+        return i;
+}
+
+enum {
+        TRACE_SAMPLE_FOO = 2,
+        TRACE_SAMPLE_BAR = 4,
+        TRACE_SAMPLE_ZOO = 8,
+};
+#endif
+
+/*
+ * If enums are used in the TP_printk(), their names will be shown in
+ * format files and not their values. This can cause problems with user
+ * space programs that parse the format files to know how to translate
+ * the raw binary trace output into human readable text.
+ *
+ * To help out user space programs, any enum that is used in the TP_printk()
+ * should be defined by TRACE_DEFINE_ENUM() macro. All that is needed to
+ * be done is to add this macro with the enum within it in the trace
+ * header file, and it will be converted in the output.
+ */
+
+TRACE_DEFINE_ENUM(TRACE_SAMPLE_FOO);
+TRACE_DEFINE_ENUM(TRACE_SAMPLE_BAR);
+TRACE_DEFINE_ENUM(TRACE_SAMPLE_ZOO);
+
+TRACE_EVENT(foo_bar,
+
+        TP_PROTO(const char *foo, int bar, const int *lst,
+                 const char *string, const struct cpumask *mask),
+
+        TP_ARGS(foo, bar, lst, string, mask),
+
+        TP_STRUCT__entry(
+                __array(        char,   foo,    10              )
+                __field(        int,    bar                     )
+                __dynamic_array(int,    list,   __length_of(lst))
+                __string(       str,    string                  )
+                __bitmask(      cpus,   num_possible_cpus()     )
+        ),
+
+        TP_fast_assign(
+                strlcpy(__entry->foo, foo, 10);
+                __entry->bar    = bar;
+                memcpy(__get_dynamic_array(list), lst,
+                       __length_of(lst) * sizeof(int));
+                __assign_str(str, string);
+                __assign_bitmask(cpus, cpumask_bits(mask), num_possible_cpus());
+        ),
+
+        TP_printk("foo %s %d %s %s %s %s (%s)", __entry->foo, __entry->bar,
+
+/*
+ * Notice here the use of some helper functions. This includes:
+ *
+ *  __print_symbolic( variable, { value, "string" }, ... ),
+ *
+ *    The variable is tested against each value of the { } pair. If
+ *    the variable matches one of the values, then it will print the
+ *    string in that pair. If non are matched, it returns a string
+ *    version of the number (if __entry->bar == 7 then "7" is returned).
+ */
+                  __print_symbolic(__entry->bar,
+                                   { 0, "zero" },
+                                   { TRACE_SAMPLE_FOO, "TWO" },
+                                   { TRACE_SAMPLE_BAR, "FOUR" },
+                                   { TRACE_SAMPLE_ZOO, "EIGHT" },
+                                   { 10, "TEN" }
+                          ),
+
+/*
+ *  __print_flags( variable, "delim", { value, "flag" }, ... ),
+ *
+ *    This is similar to __print_symbolic, except that it tests the bits
+ *    of the value. If ((FLAG & variable) == FLAG) then the string is
+ *    printed. If more than one flag matches, then each one that does is
+ *    also printed with delim in between them.
+ *    If not all bits are accounted for, then the not found bits will be
+ *    added in hex format: 0x506 will show BIT2|BIT4|0x500
+ */
+                  __print_flags(__entry->bar, "|",
+                                { 1, "BIT1" },
+                                { 2, "BIT2" },
+                                { 4, "BIT3" },
+                                { 8, "BIT4" }
+                          ),
+/*
+ *  __print_array( array, len, element_size )
+ *
+ *    This prints out the array that is defined by __array in a nice format.
+ */
+                  __print_array(__get_dynamic_array(list),
+                                __get_dynamic_array_len(list) / sizeof(int),
+                                sizeof(int)),
+                  __get_str(str), __get_bitmask(cpus))
+);
+
+/*
+ * There may be a case where a tracepoint should only be called if
+ * some condition is set. Otherwise the tracepoint should not be called.
+ * But to do something like:
+ *
+ *  if (cond)
+ *     trace_foo();
+ *
+ * Would cause a little overhead when tracing is not enabled, and that
+ * overhead, even if small, is not something we want. As tracepoints
+ * use static branch (aka jump_labels), where no branch is taken to
+ * skip the tracepoint when not enabled, and a jmp is placed to jump
+ * to the tracepoint code when it is enabled, having a if statement
+ * nullifies that optimization. It would be nice to place that
+ * condition within the static branch. This is where TRACE_EVENT_CONDITION
+ * comes in.
+ *
+ * TRACE_EVENT_CONDITION() is just like TRACE_EVENT, except it adds another
+ * parameter just after args. Where TRACE_EVENT has:
+ *
+ * TRACE_EVENT(name, proto, args, struct, assign, printk)
+ *
+ * the CONDITION version has:
+ *
+ * TRACE_EVENT_CONDITION(name, proto, args, cond, struct, assign, printk)
+ *
+ * Everything is the same as TRACE_EVENT except for the new cond. Think
+ * of the cond variable as:
+ *
+ *   if (cond)
+ *      trace_foo_bar_with_cond();
+ *
+ * Except that the logic for the if branch is placed after the static branch.
+ * That is, the if statement that processes the condition will not be
+ * executed unless that traecpoint is enabled. Otherwise it still remains
+ * a nop.
+ */
+TRACE_EVENT_CONDITION(foo_bar_with_cond,
+
+        TP_PROTO(const char *foo, int bar),
+
+        TP_ARGS(foo, bar),
+
+        TP_CONDITION(!(bar % 10)),
+
+        TP_STRUCT__entry(
+                __string(       foo,    foo             )
+                __field(        int,    bar                     )
+        ),
+
+        TP_fast_assign(
+                __assign_str(foo, foo);
+                __entry->bar    = bar;
+        ),
+
+        TP_printk("foo %s %d", __get_str(foo), __entry->bar)
+);
+
+int foo_bar_reg(void);
+void foo_bar_unreg(void);
+
+/*
+ * Now in the case that some function needs to be called when the
+ * tracepoint is enabled and/or when it is disabled, the
+ * TRACE_EVENT_FN() serves this purpose. This is just like TRACE_EVENT()
+ * but adds two more parameters at the end:
+ *
+ * TRACE_EVENT_FN( name, proto, args, struct, assign, printk, reg, unreg)
+ *
+ * reg and unreg are functions with the prototype of:
+ *
+ *    void reg(void)
+ *
+ * The reg function gets called before the tracepoint is enabled, and
+ * the unreg function gets called after the tracepoint is disabled.
+ *
+ * Note, reg and unreg are allowed to be NULL. If you only need to
+ * call a function before enabling, or after disabling, just set one
+ * function and pass in NULL for the other parameter.
+ */
+TRACE_EVENT_FN(foo_bar_with_fn,
+
+        TP_PROTO(const char *foo, int bar),
+
+        TP_ARGS(foo, bar),
+
+        TP_STRUCT__entry(
+                __string(       foo,    foo             )
+                __field(        int,    bar             )
+        ),
+
+        TP_fast_assign(
+                __assign_str(foo, foo);
+                __entry->bar    = bar;
+        ),
+
+        TP_printk("foo %s %d", __get_str(foo), __entry->bar),
+
+        foo_bar_reg, foo_bar_unreg
+);
+
+/*
+ * Each TRACE_EVENT macro creates several helper functions to produce
+ * the code to add the tracepoint, create the files in the trace
+ * directory, hook it to perf, assign the values and to print out
+ * the raw data from the ring buffer. To prevent too much bloat,
+ * if there are more than one tracepoint that uses the same format
+ * for the proto, args, struct, assign and printk, and only the name
+ * is different, it is highly recommended to use the DECLARE_EVENT_CLASS
+ *
+ * DECLARE_EVENT_CLASS() macro creates most of the functions for the
+ * tracepoint. Then DEFINE_EVENT() is use to hook a tracepoint to those
+ * functions. This DEFINE_EVENT() is an instance of the class and can
+ * be enabled and disabled separately from other events (either TRACE_EVENT
+ * or other DEFINE_EVENT()s).
+ *
+ * Note, TRACE_EVENT() itself is simply defined as:
+ *
+ * #define TRACE_EVENT(name, proto, args, tstruct, assign, printk)  \
+ *  DEFINE_EVENT_CLASS(name, proto, args, tstruct, assign, printk); \
+ *  DEFINE_EVENT(name, name, proto, args)
+ *
+ * The DEFINE_EVENT() also can be declared with conditions and reg functions:
+ *
+ * DEFINE_EVENT_CONDITION(template, name, proto, args, cond);
+ * DEFINE_EVENT_FN(template, name, proto, args, reg, unreg);
+ */
+DECLARE_EVENT_CLASS(foo_template,
+
+        TP_PROTO(const char *foo, int bar),
+
+        TP_ARGS(foo, bar),
+
+        TP_STRUCT__entry(
+                __string(       foo,    foo             )
+                __field(        int,    bar             )
+        ),
+
+        TP_fast_assign(
+                __assign_str(foo, foo);
+                __entry->bar    = bar;
+        ),
+
+        TP_printk("foo %s %d", __get_str(foo), __entry->bar)
+);
+
+/*
+ * Here's a better way for the previous samples (except, the first
+ * exmaple had more fields and could not be used here).
+ */
+DEFINE_EVENT(foo_template, foo_with_template_simple,
+        TP_PROTO(const char *foo, int bar),
+        TP_ARGS(foo, bar));
+
+DEFINE_EVENT_CONDITION(foo_template, foo_with_template_cond,
+        TP_PROTO(const char *foo, int bar),
+        TP_ARGS(foo, bar),
+        TP_CONDITION(!(bar % 8)));
+
+
+DEFINE_EVENT_FN(foo_template, foo_with_template_fn,
+        TP_PROTO(const char *foo, int bar),
+        TP_ARGS(foo, bar),
+        foo_bar_reg, foo_bar_unreg);
+
+/*
+ * Anytime two events share basically the same values and have
+ * the same output, use the DECLARE_EVENT_CLASS() and DEFINE_EVENT()
+ * when ever possible.
+ */
+
+/*
+ * If the event is similar to the DECLARE_EVENT_CLASS, but you need
+ * to have a different output, then use DEFINE_EVENT_PRINT() which
+ * lets you override the TP_printk() of the class.
+ */
+
+DEFINE_EVENT_PRINT(foo_template, foo_with_template_print,
+        TP_PROTO(const char *foo, int bar),
+        TP_ARGS(foo, bar),
+        TP_printk("bar %s %d", __get_str(foo), __entry->bar));
+
+#endif
+
+/***** NOTICE! The #if protection ends here. *****/
+
+
+/*
+ * There are several ways I could have done this. If I left out the
+ * TRACE_INCLUDE_PATH, then it would default to the kernel source
+ * include/trace/events directory.
+ *
+ * I could specify a path from the define_trace.h file back to this
+ * file.
+ *
+ * #define TRACE_INCLUDE_PATH ../../samples/trace_events
+ *
+ * But the safest and easiest way to simply make it use the directory
+ * that the file is in is to add in the Makefile:
+ *
+ * CFLAGS_trace-events-sample.o := -I$(src)
+ *
+ * This will make sure the current path is part of the include
+ * structure for our file so that define_trace.h can find it.
+ *
+ * I could have made only the top level directory the include:
+ *
+ * CFLAGS_trace-events-sample.o := -I$(PWD)
+ *
+ * And then let the path to this directory be the TRACE_INCLUDE_PATH:
+ *
+ * #define TRACE_INCLUDE_PATH samples/trace_events
+ *
+ * But then if something defines "samples" or "trace_events" as a macro
+ * then we could risk that being converted too, and give us an unexpected
+ * result.
+ */
+#undef TRACE_INCLUDE_PATH
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_PATH .
+/*
+ * TRACE_INCLUDE_FILE is not needed if the filename and TRACE_SYSTEM are equal
+ */
+#define TRACE_INCLUDE_FILE trace-events-sample
+#include <trace/define_trace.h>
diff --git a/books/kernel-sample/sample/trace_printk/Makefile b/books/kernel-sample/sample/trace_printk/Makefile
new file mode 100644
index 0000000..fbf91ab
--- /dev/null
+++ b/books/kernel-sample/sample/trace_printk/Makefile
@@ -0,0 +1,78 @@
+# ------------------------------------------------------------------------------
+#
+# Makefile for the LDD-LinuxDeviceDrivers.
+#
+# Author: gatieme
+# Create: 2016-07-29 15:50:46
+# Last modified: 2016-07-29 16:10:29
+# Description:
+# 	This program is loaded as a kernel(v2.6.18 or later) module.
+# 	Use "make install" to load it into kernel.
+# 	Use "make remove" to remove the module out of kernel.
+#
+# ------------------------------------------------------------------------------
+
+
+#	my driver description
+DRIVER_VERSION := "1.0.0"
+DRIVER_AUTHOR  := "Gatieme @ AderStep Inc..."
+DRIVER_DESC    := "Linux input module for Elo MultiTouch(MT) devices"
+DRIVER_LICENSE := "Dual BSD/GPL"
+
+
+MODULE_NAME := trace-printk
+
+#CFG_FLAGS += -O2  -I./
+#EXTRA_CFLAGS  += $(C_FLAGS) $(CFG_INC) $(CFG_INC)
+MODCFLAGS:=-O6 -Wall -DMODULE -D__KERNEL__ -DLINUX -I$(PWD) -std=c99
+
+
+
+ifneq ($(KERNELRELEASE),)
+
+
+
+
+obj-m := $(MODULE_NAME).o #print_vmarea.o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+modules:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+modules_install:
+	make -C $(KERNELDIR) M=$(PWD) modules_install
+
+
+
+insmod:
+	sudo insmod $(MODULE_NAME).ko
+
+reinsmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo insmod $(MODULE_NAME).ko
+
+github:
+	cd $(ROOT) && make github
+
+rmmod:
+	sudo rmmod $(MODULE_NAME)
+
+test :
+	sudo ../injector/memInjector -l stack -m random -t word_0 --time 1 --timeout 3 -p 1
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+	rm -f modules.order Module.symvers Module.markers
+
+.PHNOY:
+	modules modules_install clean
+
+
+
+endif
+
diff --git a/books/kernel-sample/sample/trace_printk/trace-printk.c b/books/kernel-sample/sample/trace_printk/trace-printk.c
new file mode 100644
index 0000000..d4742a7
--- /dev/null
+++ b/books/kernel-sample/sample/trace_printk/trace-printk.c
@@ -0,0 +1,56 @@
+#include <linux/module.h>
+#include <linux/kthread.h>
+#include <linux/irq_work.h>
+
+/* Must not be static to force gcc to consider these non constant */
+char *trace_printk_test_global_str =
+        "This is a dynamic string that will use trace_puts\n";
+
+char *trace_printk_test_global_str_irq =
+        "(irq) This is a dynamic string that will use trace_puts\n";
+
+char *trace_printk_test_global_str_fmt =
+        "%sThis is a %s that will use trace_printk\n";
+
+static struct irq_work irqwork;
+
+static void trace_printk_irq_work(struct irq_work *work)
+{
+        trace_printk("(irq) This is a static string that will use trace_bputs\n");
+        trace_printk(trace_printk_test_global_str_irq);
+
+        trace_printk("(irq) This is a %s that will use trace_bprintk()\n",
+                     "static string");
+
+        trace_printk(trace_printk_test_global_str_fmt,
+                     "(irq) ", "dynamic string");
+}
+
+static int __init trace_printk_init(void)
+{
+        init_irq_work(&irqwork, trace_printk_irq_work);
+
+        trace_printk("This is a static string that will use trace_bputs\n");
+        trace_printk(trace_printk_test_global_str);
+
+        /* Kick off printing in irq context */
+        irq_work_queue(&irqwork);
+
+        trace_printk("This is a %s that will use trace_bprintk()\n",
+                     "static string");
+
+        trace_printk(trace_printk_test_global_str_fmt, "", "dynamic string");
+
+        return 0;
+}
+
+static void __exit trace_printk_exit(void)
+{
+}
+
+module_init(trace_printk_init);
+module_exit(trace_printk_exit);
+
+MODULE_AUTHOR("Steven Rostedt");
+MODULE_DESCRIPTION("trace-printk");
+MODULE_LICENSE("GPL");