diff options
Diffstat (limited to 'kernel/rcu/tree_plugin.h')
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 6abb03dff5c0..eb161d80cbde 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -204,6 +204,7 @@ static void rcu_preempt_note_context_switch(int cpu) rdp = per_cpu_ptr(rcu_preempt_state.rda, cpu); rnp = rdp->mynode; raw_spin_lock_irqsave(&rnp->lock, flags); + smp_mb__after_unlock_lock(); t->rcu_read_unlock_special |= RCU_READ_UNLOCK_BLOCKED; t->rcu_blocked_node = rnp; @@ -312,6 +313,7 @@ static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp, unsigned long flags) mask = rnp->grpmask; raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */ raw_spin_lock(&rnp_p->lock); /* irqs already disabled. */ + smp_mb__after_unlock_lock(); rcu_report_qs_rnp(mask, &rcu_preempt_state, rnp_p, flags); } @@ -381,6 +383,7 @@ void rcu_read_unlock_special(struct task_struct *t) for (;;) { rnp = t->rcu_blocked_node; raw_spin_lock(&rnp->lock); /* irqs already disabled. */ + smp_mb__after_unlock_lock(); if (rnp == t->rcu_blocked_node) break; raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */ @@ -605,6 +608,7 @@ static int rcu_preempt_offline_tasks(struct rcu_state *rsp, while (!list_empty(lp)) { t = list_entry(lp->next, typeof(*t), rcu_node_entry); raw_spin_lock(&rnp_root->lock); /* irqs already disabled */ + smp_mb__after_unlock_lock(); list_del(&t->rcu_node_entry); t->rcu_blocked_node = rnp_root; list_add(&t->rcu_node_entry, lp_root); @@ -629,6 +633,7 @@ static int rcu_preempt_offline_tasks(struct rcu_state *rsp, * in this case. */ raw_spin_lock(&rnp_root->lock); /* irqs already disabled */ + smp_mb__after_unlock_lock(); if (rnp_root->boost_tasks != NULL && rnp_root->boost_tasks != rnp_root->gp_tasks && rnp_root->boost_tasks != rnp_root->exp_tasks) @@ -772,6 +777,7 @@ static void rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp, unsigned long mask; raw_spin_lock_irqsave(&rnp->lock, flags); + smp_mb__after_unlock_lock(); for (;;) { if (!sync_rcu_preempt_exp_done(rnp)) { raw_spin_unlock_irqrestore(&rnp->lock, flags); @@ -787,6 +793,7 @@ static void rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp, raw_spin_unlock(&rnp->lock); /* irqs remain disabled */ rnp = rnp->parent; raw_spin_lock(&rnp->lock); /* irqs already disabled */ + smp_mb__after_unlock_lock(); rnp->expmask &= ~mask; } } @@ -806,6 +813,7 @@ sync_rcu_preempt_exp_init(struct rcu_state *rsp, struct rcu_node *rnp) int must_wait = 0; raw_spin_lock_irqsave(&rnp->lock, flags); + smp_mb__after_unlock_lock(); if (list_empty(&rnp->blkd_tasks)) { raw_spin_unlock_irqrestore(&rnp->lock, flags); } else { @@ -886,6 +894,7 @@ void synchronize_rcu_expedited(void) /* Initialize ->expmask for all non-leaf rcu_node structures. */ rcu_for_each_nonleaf_node_breadth_first(rsp, rnp) { raw_spin_lock_irqsave(&rnp->lock, flags); + smp_mb__after_unlock_lock(); rnp->expmask = rnp->qsmaskinit; raw_spin_unlock_irqrestore(&rnp->lock, flags); } @@ -1191,6 +1200,7 @@ static int rcu_boost(struct rcu_node *rnp) return 0; /* Nothing left to boost. */ raw_spin_lock_irqsave(&rnp->lock, flags); + smp_mb__after_unlock_lock(); /* * Recheck under the lock: all tasks in need of boosting @@ -1377,6 +1387,7 @@ static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp, if (IS_ERR(t)) return PTR_ERR(t); raw_spin_lock_irqsave(&rnp->lock, flags); + smp_mb__after_unlock_lock(); rnp->boost_kthread_task = t; raw_spin_unlock_irqrestore(&rnp->lock, flags); sp.sched_priority = RCU_BOOST_PRIO; @@ -1769,6 +1780,7 @@ static void rcu_prepare_for_idle(int cpu) continue; rnp = rdp->mynode; raw_spin_lock(&rnp->lock); /* irqs already disabled. */ + smp_mb__after_unlock_lock(); rcu_accelerate_cbs(rsp, rnp, rdp); raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */ } @@ -2209,6 +2221,7 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp) struct rcu_node *rnp = rdp->mynode; raw_spin_lock_irqsave(&rnp->lock, flags); + smp_mb__after_unlock_lock(); c = rcu_start_future_gp(rnp, rdp); raw_spin_unlock_irqrestore(&rnp->lock, flags); |