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Commit 8d8a9d0e authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Remove obsolete ->dynticks_fqs and ->cond_resched_completed 



The rcu_data structure's ->dynticks_fqs is incremented but never
accesses.  Its ->cond_resched_completed field isn't used at all.
This commit therefore removes both fields.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent dc5a4f29

kernel/rcu/tree.c

+0 −1
Original line number Diff line number Diff line
@@ -1039,7 +1039,6 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp) 
	 */

	if (rcu_dynticks_in_eqs_since(rdp, rdp->dynticks_snap)) {

		trace_rcu_fqs(rcu_state.name, rdp->gp_seq, rdp->cpu, TPS("dti"));

		rdp->dynticks_fqs++;

		rcu_gpnum_ovf(rnp, rdp);

		return 1;

	}

kernel/rcu/tree.h

+3 −9
Original line number Diff line number Diff line
@@ -203,17 +203,11 @@ struct rcu_data { 
	int tick_nohz_enabled_snap;	/* Previously seen value from sysfs. */

#endif /* #ifdef CONFIG_RCU_FAST_NO_HZ */



	/* 4) reasons this CPU needed to be kicked by force_quiescent_state */

	unsigned long dynticks_fqs;	/* Kicked due to dynticks idle. */

	unsigned long cond_resched_completed;

					/* Grace period that needs help */

					/*  from cond_resched(). */



	/* 5) rcu_barrier(), OOM callbacks, and expediting. */

	/* 4) rcu_barrier(), OOM callbacks, and expediting. */

	struct rcu_head barrier_head;

	int exp_dynticks_snap;		/* Double-check need for IPI. */



	/* 6) Callback offloading. */

	/* 5) Callback offloading. */

#ifdef CONFIG_RCU_NOCB_CPU

	struct rcu_head *nocb_head;	/* CBs waiting for kthread. */

	struct rcu_head **nocb_tail;
@@ -240,7 +234,7 @@ struct rcu_data { 
					/* Leader CPU takes GP-end wakeups. */

#endif /* #ifdef CONFIG_RCU_NOCB_CPU */



	/* 7) Diagnostic data, including RCU CPU stall warnings. */

	/* 6) Diagnostic data, including RCU CPU stall warnings. */

	unsigned int softirq_snap;	/* Snapshot of softirq activity. */

	/* ->rcu_iw* fields protected by leaf rcu_node ->lock. */

	struct irq_work rcu_iw;		/* Check for non-irq activity. */