Commit dcd42591 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Paul E. McKenney
Browse files

timer: Add timer_curr_running() 



This commit adds a timer_curr_running() function that verifies that the
current code is running in the context of the specified timer's handler.

Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarBoqun Feng <boqun.feng@gmail.com>
Signed-off-by: default avatarFrederic Weisbecker <frederic@kernel.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 43759fe5

include/linux/timer.h

+2 −0
Original line number Diff line number Diff line
@@ -192,6 +192,8 @@ extern int try_to_del_timer_sync(struct timer_list *timer); 


#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

+13 −0
Original line number Diff line number Diff line
@@ -1237,6 +1237,19 @@ int try_to_del_timer_sync(struct timer_list *timer) 
}

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)

{