rcu: Rename rcu_momentary_dyntick_idle() into rcu_momentary_eqs()

The context_tracking.state RCU_DYNTICKS subvariable has been renamed to
RCU_WATCHING, replace "dyntick_idle" into "eqs" to drop the dyntick
reference.

Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>

Author: valschneider

include/linux/rcutiny.h

@@ -158,7 +158,7 @@ void rcu_scheduler_starting(void);
 static inline void rcu_end_inkernel_boot(void) { }
 static inline bool rcu_inkernel_boot_has_ended(void) { return true; }
 static inline bool rcu_is_watching(void) { return true; }
-static inline void rcu_momentary_dyntick_idle(void) { }
+static inline void rcu_momentary_eqs(void) { }
 static inline void kfree_rcu_scheduler_running(void) { }
 static inline bool rcu_gp_might_be_stalled(void) { return false; }
 

include/linux/rcutree.h

@@ -37,7 +37,7 @@ void synchronize_rcu_expedited(void);
 void kvfree_call_rcu(struct rcu_head *head, void *ptr);
 
 void rcu_barrier(void);
-void rcu_momentary_dyntick_idle(void);
+void rcu_momentary_eqs(void);
 void kfree_rcu_scheduler_running(void);
 bool rcu_gp_might_be_stalled(void);
 

kernel/rcu/rcutorture.c

@@ -2680,7 +2680,7 @@ static unsigned long rcu_torture_fwd_prog_cbfree(struct rcu_fwd *rfp)
 		rcu_torture_fwd_prog_cond_resched(freed);
 		if (tick_nohz_full_enabled()) {
 			local_irq_save(flags);
-			rcu_momentary_dyntick_idle();
+			rcu_momentary_eqs();
 			local_irq_restore(flags);
 		}
 	}
@@ -2830,7 +2830,7 @@ static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp)
 		rcu_torture_fwd_prog_cond_resched(n_launders + n_max_cbs);
 		if (tick_nohz_full_enabled()) {
 			local_irq_save(flags);
-			rcu_momentary_dyntick_idle();
+			rcu_momentary_eqs();
 			local_irq_restore(flags);
 		}
 	}

kernel/rcu/tree.c

@@ -367,7 +367,7 @@ bool rcu_watching_zero_in_eqs(int cpu, int *vp)
  *
  * The caller must have disabled interrupts and must not be idle.
  */
-notrace void rcu_momentary_dyntick_idle(void)
+notrace void rcu_momentary_eqs(void)
 {
 	int seq;
 
@@ -377,7 +377,7 @@ notrace void rcu_momentary_dyntick_idle(void)
 	WARN_ON_ONCE(!(seq & CT_RCU_WATCHING));
 	rcu_preempt_deferred_qs(current);
 }
-EXPORT_SYMBOL_GPL(rcu_momentary_dyntick_idle);
+EXPORT_SYMBOL_GPL(rcu_momentary_eqs);
 
 /**
  * rcu_is_cpu_rrupt_from_idle - see if 'interrupted' from idle

kernel/rcu/tree_nocb.h

@@ -917,7 +917,7 @@ static void nocb_cb_wait(struct rcu_data *rdp)
 	WARN_ON_ONCE(!rcu_rdp_is_offloaded(rdp));
 
 	local_irq_save(flags);
-	rcu_momentary_dyntick_idle();
+	rcu_momentary_eqs();
 	local_irq_restore(flags);
 	/*
 	 * Disable BH to provide the expected environment.  Also, when

kernel/rcu/tree_plugin.h

@@ -869,7 +869,7 @@ static void rcu_qs(void)
 
 /*
  * Register an urgently needed quiescent state.  If there is an
- * emergency, invoke rcu_momentary_dyntick_idle() to do a heavy-weight
+ * emergency, invoke rcu_momentary_eqs() to do a heavy-weight
  * dyntick-idle quiescent state visible to other CPUs, which will in
  * some cases serve for expedited as well as normal grace periods.
  * Either way, register a lightweight quiescent state.
@@ -889,7 +889,7 @@ void rcu_all_qs(void)
 	this_cpu_write(rcu_data.rcu_urgent_qs, false);
 	if (unlikely(raw_cpu_read(rcu_data.rcu_need_heavy_qs))) {
 		local_irq_save(flags);
-		rcu_momentary_dyntick_idle();
+		rcu_momentary_eqs();
 		local_irq_restore(flags);
 	}
 	rcu_qs();
@@ -909,7 +909,7 @@ void rcu_note_context_switch(bool preempt)
 		goto out;
 	this_cpu_write(rcu_data.rcu_urgent_qs, false);
 	if (unlikely(raw_cpu_read(rcu_data.rcu_need_heavy_qs)))
-		rcu_momentary_dyntick_idle();
+		rcu_momentary_eqs();
 out:
 	rcu_tasks_qs(current, preempt);
 	trace_rcu_utilization(TPS("End context switch"));

kernel/stop_machine.c

@@ -251,7 +251,7 @@ static int multi_cpu_stop(void *data)
 			 */
 			touch_nmi_watchdog();
 		}
-		rcu_momentary_dyntick_idle();
+		rcu_momentary_eqs();
 	} while (curstate != MULTI_STOP_EXIT);
 
 	local_irq_restore(flags);

kernel/trace/trace_osnoise.c

@@ -1535,7 +1535,7 @@ static int run_osnoise(void)
 		 * This will eventually cause unwarranted noise as PREEMPT_RCU
 		 * will force preemption as the means of ending the current
 		 * grace period. We avoid this problem by calling
-		 * rcu_momentary_dyntick_idle(), which performs a zero duration
+		 * rcu_momentary_eqs(), which performs a zero duration
 		 * EQS allowing PREEMPT_RCU to end the current grace period.
 		 * This call shouldn't be wrapped inside an RCU critical
 		 * section.
@@ -1547,7 +1547,7 @@ static int run_osnoise(void)
 			if (!disable_irq)
 				local_irq_disable();
 
-			rcu_momentary_dyntick_idle();
+			rcu_momentary_eqs();
 
 			if (!disable_irq)
 				local_irq_enable();