On Wed, Sep 29, 2021 at 11:37:01AM -0700, Paul E. McKenney wrote:
quoted
+void context_tracking_idle(void)
+{
+ atomic_add_return(CT_SEQ, &raw_cpu_ptr(&context_tracking)->seq);
This is presumably a momentary idle.
quoted
notrace void rcu_momentary_dyntick_idle(void)
{
- int seq;
-
raw_cpu_write(rcu_data.rcu_need_heavy_qs, false);
- seq = rcu_dynticks_inc(2);
- /* It is illegal to call this from idle state. */
- WARN_ON_ONCE(!(seq & 0x1));
+ context_tracking_idle();
rcu_preempt_deferred_qs(current);
}
It's whatever that is. It increments the actual sequence count without
modifying the state.