timer: Revert "timer: Add timer_curr_running()"

This reverts commit dcd42591ebb8a25895b551a5297ea9c24414ba54.
The only user was RCU/nocb.

Signed-off-by: Frederic Weisbecker <[e-mail]>
Cc: Josh Triplett <[e-mail]>
Cc: Lai Jiangshan <[e-mail]>
Cc: Joel Fernandes <[e-mail]>
Cc: Neeraj Upadhyay <[e-mail]>
Cc: Boqun Feng <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Signed-off-by: Paul E. McKenney <[e-mail]>

include/linux/timer.h

···
 
 #define del_singleshot_timer_sync(t) del_timer_sync(t)
 
-extern bool timer_curr_running(struct timer_list *timer);
-
 extern void init_timers(void);
 struct hrtimer;
 extern enum hrtimer_restart it_real_fn(struct hrtimer *);

kernel/time/timer.c

···
 }
 EXPORT_SYMBOL(try_to_del_timer_sync);
 
-bool timer_curr_running(struct timer_list *timer)
-{
-	int i;
-
-	for (i = 0; i < NR_BASES; i++) {
-		struct timer_base *base = this_cpu_ptr(&timer_bases[i]);
-
-		if (base->running_timer == timer)
-			return true;
-	}
-
-	return false;
-}
-
 #ifdef CONFIG_PREEMPT_RT
 static __init void timer_base_init_expiry_lock(struct timer_base *base)
 {