timer: Remove init_timer() interface

All users of init_timer() have been updated. Remove the ancient interface.

Cc: Thomas Gleixner <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Signed-off-by: Kees Cook <[e-mail]>

Documentation/core-api/local_ops.rst

···
                     printk("Read : CPU %d, count %ld\n", cpu,
                             local_read(&per_cpu(counters, cpu)));
             }
-            del_timer(&test_timer);
-            test_timer.expires = jiffies + 1000;
-            add_timer(&test_timer);
+            mod_timer(&test_timer, jiffies + 1000);
     }
 
     static int __init test_init(void)
     {
             /* initialize the timer that will increment the counter */
-            init_timer(&test_timer);
-            test_timer.function = do_test_timer;
-            test_timer.expires = jiffies + 1;
-            add_timer(&test_timer);
+            timer_setup(&test_timer, do_test_timer, 0);
+            mod_timer(&test_timer, jiffies + 1);
 
             return 0;
     }

include/linux/timer.h

···
 	init_timer_on_stack_key((_timer), (_flags), NULL, NULL)
 #endif
 
-#define init_timer(timer)						\
-	__init_timer((timer), 0)
-
 #define __setup_timer(_timer, _fn, _data, _flags)			\
 	do {								\
 		__init_timer((_timer), (_flags));			\