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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 11:49:32 +00:00
rcu: Remove rcu_data structure's ->rsp field
Now that there is only one rcu_state structure, there is no need for the rcu_data structure to indicate which it corresponds to. This commit therefore removes the rcu_data structure's ->rsp field, replacing all remaining uses of it with &rcu_state. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
parent
aedf4ba984
commit
88d1bead85
3 changed files with 34 additions and 37 deletions
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@ -1070,7 +1070,7 @@ static int dyntick_save_progress_counter(struct rcu_data *rdp)
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{
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rdp->dynticks_snap = rcu_dynticks_snap(rdp->dynticks);
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if (rcu_dynticks_in_eqs(rdp->dynticks_snap)) {
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trace_rcu_fqs(rdp->rsp->name, rdp->gp_seq, rdp->cpu, TPS("dti"));
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trace_rcu_fqs(rcu_state.name, rdp->gp_seq, rdp->cpu, TPS("dti"));
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rcu_gpnum_ovf(rdp->mynode, rdp);
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return 1;
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}
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@ -1120,7 +1120,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
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* of the current RCU grace period.
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*/
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if (rcu_dynticks_in_eqs_since(rdp->dynticks, rdp->dynticks_snap)) {
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trace_rcu_fqs(rdp->rsp->name, rdp->gp_seq, rdp->cpu, TPS("dti"));
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trace_rcu_fqs(rcu_state.name, rdp->gp_seq, rdp->cpu, TPS("dti"));
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rdp->dynticks_fqs++;
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rcu_gpnum_ovf(rnp, rdp);
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return 1;
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@ -1134,20 +1134,20 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
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*/
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jtsq = jiffies_till_sched_qs;
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ruqp = per_cpu_ptr(&rcu_dynticks.rcu_urgent_qs, rdp->cpu);
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if (time_after(jiffies, rdp->rsp->gp_start + jtsq) &&
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if (time_after(jiffies, rcu_state.gp_start + jtsq) &&
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READ_ONCE(rdp->rcu_qs_ctr_snap) != per_cpu(rcu_dynticks.rcu_qs_ctr, rdp->cpu) &&
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rcu_seq_current(&rdp->gp_seq) == rnp->gp_seq && !rdp->gpwrap) {
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trace_rcu_fqs(rdp->rsp->name, rdp->gp_seq, rdp->cpu, TPS("rqc"));
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trace_rcu_fqs(rcu_state.name, rdp->gp_seq, rdp->cpu, TPS("rqc"));
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rcu_gpnum_ovf(rnp, rdp);
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return 1;
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} else if (time_after(jiffies, rdp->rsp->gp_start + jtsq)) {
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} else if (time_after(jiffies, rcu_state.gp_start + jtsq)) {
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/* Load rcu_qs_ctr before store to rcu_urgent_qs. */
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smp_store_release(ruqp, true);
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}
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/* If waiting too long on an offline CPU, complain. */
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if (!(rdp->grpmask & rcu_rnp_online_cpus(rnp)) &&
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time_after(jiffies, rdp->rsp->gp_start + HZ)) {
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time_after(jiffies, rcu_state.gp_start + HZ)) {
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bool onl;
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struct rcu_node *rnp1;
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@ -1185,12 +1185,12 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
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*/
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rnhqp = &per_cpu(rcu_dynticks.rcu_need_heavy_qs, rdp->cpu);
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if (!READ_ONCE(*rnhqp) &&
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(time_after(jiffies, rdp->rsp->gp_start + jtsq) ||
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time_after(jiffies, rdp->rsp->jiffies_resched))) {
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(time_after(jiffies, rcu_state.gp_start + jtsq) ||
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time_after(jiffies, rcu_state.jiffies_resched))) {
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WRITE_ONCE(*rnhqp, true);
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/* Store rcu_need_heavy_qs before rcu_urgent_qs. */
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smp_store_release(ruqp, true);
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rdp->rsp->jiffies_resched += jtsq; /* Re-enable beating. */
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rcu_state.jiffies_resched += jtsq; /* Re-enable beating. */
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}
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/*
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@ -1199,7 +1199,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
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* see if the CPU is getting hammered with interrupts, but only
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* once per grace period, just to keep the IPIs down to a dull roar.
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*/
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if (jiffies - rdp->rsp->gp_start > rcu_jiffies_till_stall_check() / 2) {
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if (jiffies - rcu_state.gp_start > rcu_jiffies_till_stall_check() / 2) {
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resched_cpu(rdp->cpu);
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if (IS_ENABLED(CONFIG_IRQ_WORK) &&
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!rdp->rcu_iw_pending && rdp->rcu_iw_gp_seq != rnp->gp_seq &&
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@ -1526,7 +1526,7 @@ void rcu_cpu_stall_reset(void)
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static void trace_rcu_this_gp(struct rcu_node *rnp, struct rcu_data *rdp,
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unsigned long gp_seq_req, const char *s)
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{
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trace_rcu_future_grace_period(rdp->rsp->name, rnp->gp_seq, gp_seq_req,
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trace_rcu_future_grace_period(rcu_state.name, rnp->gp_seq, gp_seq_req,
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rnp->level, rnp->grplo, rnp->grphi, s);
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}
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@ -1550,7 +1550,7 @@ static bool rcu_start_this_gp(struct rcu_node *rnp_start, struct rcu_data *rdp,
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unsigned long gp_seq_req)
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{
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bool ret = false;
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struct rcu_state *rsp = rdp->rsp;
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struct rcu_state *rsp = &rcu_state;
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struct rcu_node *rnp;
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/*
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@ -3167,8 +3167,7 @@ static void _rcu_barrier_trace(const char *s, int cpu, unsigned long done)
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*/
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static void rcu_barrier_callback(struct rcu_head *rhp)
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{
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struct rcu_data *rdp = container_of(rhp, struct rcu_data, barrier_head);
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struct rcu_state *rsp = rdp->rsp;
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struct rcu_state *rsp = &rcu_state;
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if (atomic_dec_and_test(&rsp->barrier_cpu_count)) {
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_rcu_barrier_trace(TPS("LastCB"), -1, rsp->barrier_sequence);
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@ -3365,7 +3364,6 @@ rcu_boot_init_percpu_data(int cpu)
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rdp->rcu_onl_gp_seq = rcu_state.gp_seq;
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rdp->rcu_onl_gp_flags = RCU_GP_CLEANED;
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rdp->cpu = cpu;
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rdp->rsp = &rcu_state;
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rcu_boot_init_nocb_percpu_data(rdp);
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}
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@ -265,7 +265,6 @@ struct rcu_data {
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short rcu_onl_gp_flags; /* ->gp_flags at last online. */
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int cpu;
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struct rcu_state *rsp;
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};
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/* Values for nocb_defer_wakeup field in struct rcu_data. */
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@ -350,7 +350,7 @@ void rcu_note_context_switch(bool preempt)
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*/
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WARN_ON_ONCE((rdp->grpmask & rcu_rnp_online_cpus(rnp)) == 0);
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WARN_ON_ONCE(!list_empty(&t->rcu_node_entry));
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trace_rcu_preempt_task(rdp->rsp->name,
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trace_rcu_preempt_task(rcu_state.name,
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t->pid,
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(rnp->qsmask & rdp->grpmask)
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? rnp->gp_seq
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@ -1951,7 +1951,7 @@ static void wake_nocb_leader_defer(struct rcu_data *rdp, int waketype,
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if (rdp->nocb_defer_wakeup == RCU_NOCB_WAKE_NOT)
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mod_timer(&rdp->nocb_timer, jiffies + 1);
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WRITE_ONCE(rdp->nocb_defer_wakeup, waketype);
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, reason);
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, reason);
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raw_spin_unlock_irqrestore(&rdp->nocb_lock, flags);
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}
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@ -2030,7 +2030,7 @@ static void __call_rcu_nocb_enqueue(struct rcu_data *rdp,
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/* If we are not being polled and there is a kthread, awaken it ... */
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t = READ_ONCE(rdp->nocb_kthread);
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if (rcu_nocb_poll || !t) {
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
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TPS("WakeNotPoll"));
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return;
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}
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@ -2039,7 +2039,7 @@ static void __call_rcu_nocb_enqueue(struct rcu_data *rdp,
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if (!irqs_disabled_flags(flags)) {
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/* ... if queue was empty ... */
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wake_nocb_leader(rdp, false);
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
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TPS("WakeEmpty"));
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} else {
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wake_nocb_leader_defer(rdp, RCU_NOCB_WAKE,
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@ -2050,7 +2050,7 @@ static void __call_rcu_nocb_enqueue(struct rcu_data *rdp,
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/* ... or if many callbacks queued. */
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if (!irqs_disabled_flags(flags)) {
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wake_nocb_leader(rdp, true);
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
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TPS("WakeOvf"));
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} else {
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wake_nocb_leader_defer(rdp, RCU_NOCB_WAKE_FORCE,
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@ -2058,7 +2058,7 @@ static void __call_rcu_nocb_enqueue(struct rcu_data *rdp,
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}
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rdp->qlen_last_fqs_check = LONG_MAX / 2;
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} else {
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, TPS("WakeNot"));
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("WakeNot"));
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}
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return;
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}
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@ -2080,12 +2080,12 @@ static bool __call_rcu_nocb(struct rcu_data *rdp, struct rcu_head *rhp,
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return false;
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__call_rcu_nocb_enqueue(rdp, rhp, &rhp->next, 1, lazy, flags);
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if (__is_kfree_rcu_offset((unsigned long)rhp->func))
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trace_rcu_kfree_callback(rdp->rsp->name, rhp,
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trace_rcu_kfree_callback(rcu_state.name, rhp,
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(unsigned long)rhp->func,
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-atomic_long_read(&rdp->nocb_q_count_lazy),
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-atomic_long_read(&rdp->nocb_q_count));
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else
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trace_rcu_callback(rdp->rsp->name, rhp,
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trace_rcu_callback(rcu_state.name, rhp,
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-atomic_long_read(&rdp->nocb_q_count_lazy),
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-atomic_long_read(&rdp->nocb_q_count));
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@ -2135,7 +2135,7 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
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struct rcu_node *rnp = rdp->mynode;
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local_irq_save(flags);
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c = rcu_seq_snap(&rdp->rsp->gp_seq);
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c = rcu_seq_snap(&rcu_state.gp_seq);
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if (!rdp->gpwrap && ULONG_CMP_GE(rdp->gp_seq_needed, c)) {
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local_irq_restore(flags);
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} else {
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@ -2180,7 +2180,7 @@ static void nocb_leader_wait(struct rcu_data *my_rdp)
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/* Wait for callbacks to appear. */
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if (!rcu_nocb_poll) {
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trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu, TPS("Sleep"));
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trace_rcu_nocb_wake(rcu_state.name, my_rdp->cpu, TPS("Sleep"));
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swait_event_interruptible_exclusive(my_rdp->nocb_wq,
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!READ_ONCE(my_rdp->nocb_leader_sleep));
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raw_spin_lock_irqsave(&my_rdp->nocb_lock, flags);
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@ -2190,7 +2190,7 @@ static void nocb_leader_wait(struct rcu_data *my_rdp)
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raw_spin_unlock_irqrestore(&my_rdp->nocb_lock, flags);
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} else if (firsttime) {
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firsttime = false; /* Don't drown trace log with "Poll"! */
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trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu, TPS("Poll"));
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trace_rcu_nocb_wake(rcu_state.name, my_rdp->cpu, TPS("Poll"));
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}
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/*
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@ -2217,7 +2217,7 @@ static void nocb_leader_wait(struct rcu_data *my_rdp)
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if (rcu_nocb_poll) {
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schedule_timeout_interruptible(1);
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} else {
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trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu,
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trace_rcu_nocb_wake(rcu_state.name, my_rdp->cpu,
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TPS("WokeEmpty"));
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}
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goto wait_again;
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@ -2262,7 +2262,7 @@ static void nocb_leader_wait(struct rcu_data *my_rdp)
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static void nocb_follower_wait(struct rcu_data *rdp)
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{
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for (;;) {
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, TPS("FollowerSleep"));
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("FollowerSleep"));
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swait_event_interruptible_exclusive(rdp->nocb_wq,
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READ_ONCE(rdp->nocb_follower_head));
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if (smp_load_acquire(&rdp->nocb_follower_head)) {
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@ -2270,7 +2270,7 @@ static void nocb_follower_wait(struct rcu_data *rdp)
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return;
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}
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WARN_ON(signal_pending(current));
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, TPS("WokeEmpty"));
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("WokeEmpty"));
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}
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}
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@ -2305,10 +2305,10 @@ static int rcu_nocb_kthread(void *arg)
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rdp->nocb_follower_tail = &rdp->nocb_follower_head;
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raw_spin_unlock_irqrestore(&rdp->nocb_lock, flags);
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BUG_ON(!list);
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, TPS("WokeNonEmpty"));
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("WokeNonEmpty"));
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/* Each pass through the following loop invokes a callback. */
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trace_rcu_batch_start(rdp->rsp->name,
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trace_rcu_batch_start(rcu_state.name,
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atomic_long_read(&rdp->nocb_q_count_lazy),
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atomic_long_read(&rdp->nocb_q_count), -1);
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c = cl = 0;
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@ -2316,23 +2316,23 @@ static int rcu_nocb_kthread(void *arg)
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next = list->next;
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/* Wait for enqueuing to complete, if needed. */
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while (next == NULL && &list->next != tail) {
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
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TPS("WaitQueue"));
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schedule_timeout_interruptible(1);
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
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TPS("WokeQueue"));
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next = list->next;
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}
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debug_rcu_head_unqueue(list);
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local_bh_disable();
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if (__rcu_reclaim(rdp->rsp->name, list))
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if (__rcu_reclaim(rcu_state.name, list))
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cl++;
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c++;
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local_bh_enable();
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cond_resched_tasks_rcu_qs();
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list = next;
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}
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trace_rcu_batch_end(rdp->rsp->name, c, !!list, 0, 0, 1);
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trace_rcu_batch_end(rcu_state.name, c, !!list, 0, 0, 1);
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smp_mb__before_atomic(); /* _add after CB invocation. */
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atomic_long_add(-c, &rdp->nocb_q_count);
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atomic_long_add(-cl, &rdp->nocb_q_count_lazy);
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@ -2360,7 +2360,7 @@ static void do_nocb_deferred_wakeup_common(struct rcu_data *rdp)
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ndw = READ_ONCE(rdp->nocb_defer_wakeup);
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WRITE_ONCE(rdp->nocb_defer_wakeup, RCU_NOCB_WAKE_NOT);
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__wake_nocb_leader(rdp, ndw == RCU_NOCB_WAKE_FORCE, flags);
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trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, TPS("DeferredWake"));
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trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("DeferredWake"));
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}
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/* Do a deferred wakeup of rcu_nocb_kthread() from a timer handler. */
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