treewide: Replace kernel.h by printk.h

The kernel.h should be discouraged for use.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

examples/bottomhalf.c

@@ -11,8 +11,8 @@
 #include <linux/delay.h>
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
-#include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/printk.h>
 
 /* Macro DECLARE_TASKLET_OLD exists for compatibiity.
  * See https://lwn.net/Articles/830964/

examples/completions.c

@@ -4,9 +4,9 @@
 #include <linux/completion.h>
 #include <linux/err.h> /* for IS_ERR() */
 #include <linux/init.h>
-#include <linux/kernel.h>
 #include <linux/kthread.h>
 #include <linux/module.h>
+#include <linux/printk.h>
 
 static struct {
     struct completion crank_comp;

examples/example_atomic.c

@@ -3,8 +3,8 @@
  */
 #include <linux/atomic.h>
 #include <linux/bitops.h>
-#include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/printk.h>
 
 #define BYTE_TO_BINARY_PATTERN "%c%c%c%c%c%c%c%c"
 #define BYTE_TO_BINARY(byte)                                                   \

examples/example_mutex.c

@@ -1,9 +1,9 @@
 /*
  * example_mutex.c
  */
-#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/printk.h>
 
 static DEFINE_MUTEX(mymutex);
 

examples/example_rwlock.c

@@ -1,8 +1,8 @@
 /*
  * example_rwlock.c
  */
-#include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/printk.h>
 #include <linux/rwlock.h>
 
 static DEFINE_RWLOCK(myrwlock);

examples/example_spinlock.c

@@ -2,8 +2,8 @@
  * example_spinlock.c
  */
 #include <linux/init.h>
-#include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/printk.h>
 #include <linux/spinlock.h>
 
 static DEFINE_SPINLOCK(sl_static);

examples/example_tasklet.c

@@ -3,8 +3,8 @@
  */
 #include <linux/delay.h>
 #include <linux/interrupt.h>
-#include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/printk.h>
 
 /* Macro DECLARE_TASKLET_OLD exists for compatibility.
  * See https://lwn.net/Articles/830964/

examples/hello-1.c

@@ -1,8 +1,8 @@
 /*
  * hello-1.c - The simplest kernel module.
  */
-#include <linux/kernel.h> /* Needed for pr_info() */
 #include <linux/module.h> /* Needed by all modules */
+#include <linux/printk.h> /* Needed for pr_info() */
 
 int init_module(void)
 {

examples/hello-2.c

@@ -3,8 +3,8 @@
  * This is preferred over using init_module() and cleanup_module().
  */
 #include <linux/init.h> /* Needed for the macros */
-#include <linux/kernel.h> /* Needed for pr_info() */
 #include <linux/module.h> /* Needed by all modules */
+#include <linux/printk.h> /* Needed for pr_info() */
 
 static int __init hello_2_init(void)
 {

examples/hello-3.c

@@ -2,8 +2,8 @@
  * hello-3.c - Illustrating the __init, __initdata and __exit macros.
  */
 #include <linux/init.h> /* Needed for the macros */
-#include <linux/kernel.h> /* Needed for pr_info() */
 #include <linux/module.h> /* Needed by all modules */
+#include <linux/printk.h> /* Needed for pr_info() */
 
 static int hello3_data __initdata = 3;
 

examples/hello-4.c

@@ -2,8 +2,8 @@
  * hello-4.c - Demonstrates module documentation.
  */
 #include <linux/init.h> /* Needed for the macros */
-#include <linux/kernel.h> /* Needed for pr_info() */
 #include <linux/module.h> /* Needed by all modules */
+#include <linux/printk.h> /* Needed for pr_info() */
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("LKMPG");

examples/hello-5.c

@@ -2,9 +2,10 @@
  * hello-5.c - Demonstrates command line argument passing to a module.
  */
 #include <linux/init.h>
-#include <linux/kernel.h>
+#include <linux/kernel.h> /* for ARRAY_SIZE() */
 #include <linux/module.h>
 #include <linux/moduleparam.h>
+#include <linux/printk.h>
 #include <linux/stat.h>
 
 MODULE_LICENSE("GPL");

examples/intrpt.c

@@ -10,8 +10,9 @@
 
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
-#include <linux/kernel.h>
+#include <linux/kernel.h> /* for ARRAY_SIZE() */
 #include <linux/module.h>
+#include <linux/printk.h>
 
 static int button_irqs[] = { -1, -1 };
 

examples/sleep.c

@@ -5,8 +5,9 @@
 
 #include <linux/atomic.h>
 #include <linux/fs.h>
-#include <linux/kernel.h> /* We're doing kernel work */
+#include <linux/kernel.h> /* for sprintf() */
 #include <linux/module.h> /* Specifically, a module */
+#include <linux/printk.h>
 #include <linux/proc_fs.h> /* Necessary because we use proc fs */
 #include <linux/types.h>
 #include <linux/uaccess.h> /* for get_user and put_user */

lkmpg.tex

@@ -401,7 +401,7 @@ The \cpp|cleanup_module()| function is supposed to undo whatever \cpp|init_modul
 
 Lastly, every kernel module needs to include \verb|<linux/module.h>|.
 % TODO: adjust the section anchor
-We needed to include \verb|<linux/kernel.h>| only for the macro expansion for the \cpp|pr_alert()| log level, which you'll learn about in Section \ref{sec:printk}.
+We needed to include \verb|<linux/printk.h>| only for the macro expansion for the \cpp|pr_alert()| log level, which you'll learn about in Section \ref{sec:printk}.
 
 \begin{enumerate}
   \item A point about coding style.