s390: cmm: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-s390@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>

arch/s390/mm/cmm.c

@@ -56,10 +56,10 @@ static DEFINE_SPINLOCK(cmm_lock);
 
 static struct task_struct *cmm_thread_ptr;
 static DECLARE_WAIT_QUEUE_HEAD(cmm_thread_wait);
-static DEFINE_TIMER(cmm_timer, NULL);
 
-static void cmm_timer_fn(unsigned long);
+static void cmm_timer_fn(struct timer_list *);
 static void cmm_set_timer(void);
+static DEFINE_TIMER(cmm_timer, cmm_timer_fn);
 
 static long cmm_alloc_pages(long nr, long *counter,
 			    struct cmm_page_array **list)
@@ -194,13 +194,11 @@ static void cmm_set_timer(void)
 		if (mod_timer(&cmm_timer, jiffies + cmm_timeout_seconds*HZ))
 			return;
 	}
-	cmm_timer.function = cmm_timer_fn;
-	cmm_timer.data = 0;
 	cmm_timer.expires = jiffies + cmm_timeout_seconds*HZ;
 	add_timer(&cmm_timer);
 }
 
-static void cmm_timer_fn(unsigned long ignored)
+static void cmm_timer_fn(struct timer_list *unused)
 {
 	long nr;