RCU needs to check if the current code is running a specific timer callback, in the middle of other conditions to check the sanity of RCU-nocb. Provide a helper for that.
Signed-off-by: Frederic Weisbecker <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Josh Triplett <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Mathieu Desnoyers <[email protected]> Cc: Lai Jiangshan <[email protected]> Cc: Joel Fernandes <[email protected]> Cc: Neeraj Upadhyay <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Boqun Feng <[email protected]> --- include/linux/timer.h | 2 ++ kernel/time/timer.c | 13 +++++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/timer.h b/include/linux/timer.h index d10bc7e73b41..c75dbf7d118f 100644 --- a/include/linux/timer.h +++ b/include/linux/timer.h @@ -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); extern void run_local_timers(void); struct hrtimer; diff --git a/kernel/time/timer.c b/kernel/time/timer.c index de37e33a868d..9d41e4c4cfd4 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1242,6 +1242,19 @@ 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) { -- 2.25.1
