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timer: Add timer_curr_running()

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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: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Frederic Weisbecker 2020-11-13 13:13:33 +01:00 committed by Paul E. McKenney
parent 43759fe5a1
commit dcd42591eb
2 changed files with 15 additions and 0 deletions
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2
include/linux/timer.h
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@ -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 *);

13
kernel/time/timer.c
View File

@ -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)
{