rcu: Convert to raw_spinlocks
Paul E. McKenney [Tue, 23 Feb 2010 01:05:02 +0000 (17:05 -0800)]
The spinlocks in rcutree need to be real spinlocks in
preempt-rt. Convert them to raw_spinlocks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1266887105-1528-18-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/rcutree.c
kernel/rcutree.h
kernel/rcutree_plugin.h

index dd0d31d..65a807b 100644 (file)
@@ -66,11 +66,11 @@ static struct lock_class_key rcu_node_class[NUM_RCU_LVLS];
        .signaled = RCU_GP_IDLE, \
        .gpnum = -300, \
        .completed = -300, \
-       .onofflock = __SPIN_LOCK_UNLOCKED(&name.onofflock), \
+       .onofflock = __RAW_SPIN_LOCK_UNLOCKED(&name.onofflock), \
        .orphan_cbs_list = NULL, \
        .orphan_cbs_tail = &name.orphan_cbs_list, \
        .orphan_qlen = 0, \
-       .fqslock = __SPIN_LOCK_UNLOCKED(&name.fqslock), \
+       .fqslock = __RAW_SPIN_LOCK_UNLOCKED(&name.fqslock), \
        .n_force_qs = 0, \
        .n_force_qs_ngp = 0, \
 }
@@ -457,10 +457,10 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
 
        /* Only let one CPU complain about others per time interval. */
 
-       spin_lock_irqsave(&rnp->lock, flags);
+       raw_spin_lock_irqsave(&rnp->lock, flags);
        delta = jiffies - rsp->jiffies_stall;
        if (delta < RCU_STALL_RAT_DELAY || !rcu_gp_in_progress(rsp)) {
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
                return;
        }
        rsp->jiffies_stall = jiffies + RCU_SECONDS_TILL_STALL_RECHECK;
@@ -470,7 +470,7 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
         * due to CPU offlining.
         */
        rcu_print_task_stall(rnp);
-       spin_unlock_irqrestore(&rnp->lock, flags);
+       raw_spin_unlock_irqrestore(&rnp->lock, flags);
 
        /* OK, time to rat on our buddy... */
 
@@ -499,11 +499,11 @@ static void print_cpu_stall(struct rcu_state *rsp)
                        smp_processor_id(), jiffies - rsp->gp_start);
        trigger_all_cpu_backtrace();
 
-       spin_lock_irqsave(&rnp->lock, flags);
+       raw_spin_lock_irqsave(&rnp->lock, flags);
        if (ULONG_CMP_GE(jiffies, rsp->jiffies_stall))
                rsp->jiffies_stall =
                        jiffies + RCU_SECONDS_TILL_STALL_RECHECK;
-       spin_unlock_irqrestore(&rnp->lock, flags);
+       raw_spin_unlock_irqrestore(&rnp->lock, flags);
 
        set_need_resched();  /* kick ourselves to get things going. */
 }
@@ -563,12 +563,12 @@ static void note_new_gpnum(struct rcu_state *rsp, struct rcu_data *rdp)
        local_irq_save(flags);
        rnp = rdp->mynode;
        if (rdp->gpnum == ACCESS_ONCE(rnp->gpnum) || /* outside lock. */
-           !spin_trylock(&rnp->lock)) { /* irqs already off, retry later. */
+           !raw_spin_trylock(&rnp->lock)) { /* irqs already off, so later. */
                local_irq_restore(flags);
                return;
        }
        __note_new_gpnum(rsp, rnp, rdp);
-       spin_unlock_irqrestore(&rnp->lock, flags);
+       raw_spin_unlock_irqrestore(&rnp->lock, flags);
 }
 
 /*
@@ -627,12 +627,12 @@ rcu_process_gp_end(struct rcu_state *rsp, struct rcu_data *rdp)
        local_irq_save(flags);
        rnp = rdp->mynode;
        if (rdp->completed == ACCESS_ONCE(rnp->completed) || /* outside lock. */
-           !spin_trylock(&rnp->lock)) { /* irqs already off, retry later. */
+           !raw_spin_trylock(&rnp->lock)) { /* irqs already off, so later. */
                local_irq_restore(flags);
                return;
        }
        __rcu_process_gp_end(rsp, rnp, rdp);
-       spin_unlock_irqrestore(&rnp->lock, flags);
+       raw_spin_unlock_irqrestore(&rnp->lock, flags);
 }
 
 /*
@@ -681,10 +681,10 @@ rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
                if (cpu_needs_another_gp(rsp, rdp))
                        rsp->fqs_need_gp = 1;
                if (rnp->completed == rsp->completed) {
-                       spin_unlock_irqrestore(&rnp->lock, flags);
+                       raw_spin_unlock_irqrestore(&rnp->lock, flags);
                        return;
                }
-               spin_unlock(&rnp->lock);         /* irqs remain disabled. */
+               raw_spin_unlock(&rnp->lock);     /* irqs remain disabled. */
 
                /*
                 * Propagate new ->completed value to rcu_node structures
@@ -692,9 +692,9 @@ rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
                 * of the next grace period to process their callbacks.
                 */
                rcu_for_each_node_breadth_first(rsp, rnp) {
-                       spin_lock(&rnp->lock);   /* irqs already disabled. */
+                       raw_spin_lock(&rnp->lock); /* irqs already disabled. */
                        rnp->completed = rsp->completed;
-                       spin_unlock(&rnp->lock); /* irqs remain disabled. */
+                       raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */
                }
                local_irq_restore(flags);
                return;
@@ -715,15 +715,15 @@ rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
                rnp->completed = rsp->completed;
                rsp->signaled = RCU_SIGNAL_INIT; /* force_quiescent_state OK. */
                rcu_start_gp_per_cpu(rsp, rnp, rdp);
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
                return;
        }
 
-       spin_unlock(&rnp->lock);  /* leave irqs disabled. */
+       raw_spin_unlock(&rnp->lock);  /* leave irqs disabled. */
 
 
        /* Exclude any concurrent CPU-hotplug operations. */
-       spin_lock(&rsp->onofflock);  /* irqs already disabled. */
+       raw_spin_lock(&rsp->onofflock);  /* irqs already disabled. */
 
        /*
         * Set the quiescent-state-needed bits in all the rcu_node
@@ -743,21 +743,21 @@ rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
         * irqs disabled.
         */
        rcu_for_each_node_breadth_first(rsp, rnp) {
-               spin_lock(&rnp->lock);          /* irqs already disabled. */
+               raw_spin_lock(&rnp->lock);      /* irqs already disabled. */
                rcu_preempt_check_blocked_tasks(rnp);
                rnp->qsmask = rnp->qsmaskinit;
                rnp->gpnum = rsp->gpnum;
                rnp->completed = rsp->completed;
                if (rnp == rdp->mynode)
                        rcu_start_gp_per_cpu(rsp, rnp, rdp);
-               spin_unlock(&rnp->lock);        /* irqs remain disabled. */
+               raw_spin_unlock(&rnp->lock);    /* irqs remain disabled. */
        }
 
        rnp = rcu_get_root(rsp);
-       spin_lock(&rnp->lock);                  /* irqs already disabled. */
+       raw_spin_lock(&rnp->lock);              /* irqs already disabled. */
        rsp->signaled = RCU_SIGNAL_INIT; /* force_quiescent_state now OK. */
-       spin_unlock(&rnp->lock);                /* irqs remain disabled. */
-       spin_unlock_irqrestore(&rsp->onofflock, flags);
+       raw_spin_unlock(&rnp->lock);            /* irqs remain disabled. */
+       raw_spin_unlock_irqrestore(&rsp->onofflock, flags);
 }
 
 /*
@@ -796,14 +796,14 @@ rcu_report_qs_rnp(unsigned long mask, struct rcu_state *rsp,
                if (!(rnp->qsmask & mask)) {
 
                        /* Our bit has already been cleared, so done. */
-                       spin_unlock_irqrestore(&rnp->lock, flags);
+                       raw_spin_unlock_irqrestore(&rnp->lock, flags);
                        return;
                }
                rnp->qsmask &= ~mask;
                if (rnp->qsmask != 0 || rcu_preempted_readers(rnp)) {
 
                        /* Other bits still set at this level, so done. */
-                       spin_unlock_irqrestore(&rnp->lock, flags);
+                       raw_spin_unlock_irqrestore(&rnp->lock, flags);
                        return;
                }
                mask = rnp->grpmask;
@@ -813,10 +813,10 @@ rcu_report_qs_rnp(unsigned long mask, struct rcu_state *rsp,
 
                        break;
                }
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
                rnp_c = rnp;
                rnp = rnp->parent;
-               spin_lock_irqsave(&rnp->lock, flags);
+               raw_spin_lock_irqsave(&rnp->lock, flags);
                WARN_ON_ONCE(rnp_c->qsmask);
        }
 
@@ -845,7 +845,7 @@ rcu_report_qs_rdp(int cpu, struct rcu_state *rsp, struct rcu_data *rdp, long las
        struct rcu_node *rnp;
 
        rnp = rdp->mynode;
-       spin_lock_irqsave(&rnp->lock, flags);
+       raw_spin_lock_irqsave(&rnp->lock, flags);
        if (lastcomp != rnp->completed) {
 
                /*
@@ -857,12 +857,12 @@ rcu_report_qs_rdp(int cpu, struct rcu_state *rsp, struct rcu_data *rdp, long las
                 * race occurred.
                 */
                rdp->passed_quiesc = 0; /* try again later! */
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
                return;
        }
        mask = rdp->grpmask;
        if ((rnp->qsmask & mask) == 0) {
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
        } else {
                rdp->qs_pending = 0;
 
@@ -926,7 +926,7 @@ static void rcu_send_cbs_to_orphanage(struct rcu_state *rsp)
 
        if (rdp->nxtlist == NULL)
                return;  /* irqs disabled, so comparison is stable. */
-       spin_lock(&rsp->onofflock);  /* irqs already disabled. */
+       raw_spin_lock(&rsp->onofflock);  /* irqs already disabled. */
        *rsp->orphan_cbs_tail = rdp->nxtlist;
        rsp->orphan_cbs_tail = rdp->nxttail[RCU_NEXT_TAIL];
        rdp->nxtlist = NULL;
@@ -934,7 +934,7 @@ static void rcu_send_cbs_to_orphanage(struct rcu_state *rsp)
                rdp->nxttail[i] = &rdp->nxtlist;
        rsp->orphan_qlen += rdp->qlen;
        rdp->qlen = 0;
-       spin_unlock(&rsp->onofflock);  /* irqs remain disabled. */
+       raw_spin_unlock(&rsp->onofflock);  /* irqs remain disabled. */
 }
 
 /*
@@ -945,10 +945,10 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp)
        unsigned long flags;
        struct rcu_data *rdp;
 
-       spin_lock_irqsave(&rsp->onofflock, flags);
+       raw_spin_lock_irqsave(&rsp->onofflock, flags);
        rdp = rsp->rda[smp_processor_id()];
        if (rsp->orphan_cbs_list == NULL) {
-               spin_unlock_irqrestore(&rsp->onofflock, flags);
+               raw_spin_unlock_irqrestore(&rsp->onofflock, flags);
                return;
        }
        *rdp->nxttail[RCU_NEXT_TAIL] = rsp->orphan_cbs_list;
@@ -957,7 +957,7 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp)
        rsp->orphan_cbs_list = NULL;
        rsp->orphan_cbs_tail = &rsp->orphan_cbs_list;
        rsp->orphan_qlen = 0;
-       spin_unlock_irqrestore(&rsp->onofflock, flags);
+       raw_spin_unlock_irqrestore(&rsp->onofflock, flags);
 }
 
 /*
@@ -973,23 +973,23 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
        struct rcu_node *rnp;
 
        /* Exclude any attempts to start a new grace period. */
-       spin_lock_irqsave(&rsp->onofflock, flags);
+       raw_spin_lock_irqsave(&rsp->onofflock, flags);
 
        /* Remove the outgoing CPU from the masks in the rcu_node hierarchy. */
        rnp = rdp->mynode;      /* this is the outgoing CPU's rnp. */
        mask = rdp->grpmask;    /* rnp->grplo is constant. */
        do {
-               spin_lock(&rnp->lock);          /* irqs already disabled. */
+               raw_spin_lock(&rnp->lock);      /* irqs already disabled. */
                rnp->qsmaskinit &= ~mask;
                if (rnp->qsmaskinit != 0) {
                        if (rnp != rdp->mynode)
-                               spin_unlock(&rnp->lock); /* irqs remain disabled. */
+                               raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */
                        break;
                }
                if (rnp == rdp->mynode)
                        need_report = rcu_preempt_offline_tasks(rsp, rnp, rdp);
                else
-                       spin_unlock(&rnp->lock); /* irqs remain disabled. */
+                       raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */
                mask = rnp->grpmask;
                rnp = rnp->parent;
        } while (rnp != NULL);
@@ -1000,12 +1000,12 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
         * because invoking rcu_report_unblock_qs_rnp() with ->onofflock
         * held leads to deadlock.
         */
-       spin_unlock(&rsp->onofflock); /* irqs remain disabled. */
+       raw_spin_unlock(&rsp->onofflock); /* irqs remain disabled. */
        rnp = rdp->mynode;
        if (need_report & RCU_OFL_TASKS_NORM_GP)
                rcu_report_unblock_qs_rnp(rnp, flags);
        else
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
        if (need_report & RCU_OFL_TASKS_EXP_GP)
                rcu_report_exp_rnp(rsp, rnp);
 
@@ -1176,13 +1176,13 @@ static void force_qs_rnp(struct rcu_state *rsp, int (*f)(struct rcu_data *))
 
        rcu_for_each_leaf_node(rsp, rnp) {
                mask = 0;
-               spin_lock_irqsave(&rnp->lock, flags);
+               raw_spin_lock_irqsave(&rnp->lock, flags);
                if (!rcu_gp_in_progress(rsp)) {
-                       spin_unlock_irqrestore(&rnp->lock, flags);
+                       raw_spin_unlock_irqrestore(&rnp->lock, flags);
                        return;
                }
                if (rnp->qsmask == 0) {
-                       spin_unlock_irqrestore(&rnp->lock, flags);
+                       raw_spin_unlock_irqrestore(&rnp->lock, flags);
                        continue;
                }
                cpu = rnp->grplo;
@@ -1197,7 +1197,7 @@ static void force_qs_rnp(struct rcu_state *rsp, int (*f)(struct rcu_data *))
                        rcu_report_qs_rnp(mask, rsp, rnp, flags);
                        continue;
                }
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
        }
 }
 
@@ -1212,18 +1212,18 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
 
        if (!rcu_gp_in_progress(rsp))
                return;  /* No grace period in progress, nothing to force. */
-       if (!spin_trylock_irqsave(&rsp->fqslock, flags)) {
+       if (!raw_spin_trylock_irqsave(&rsp->fqslock, flags)) {
                rsp->n_force_qs_lh++; /* Inexact, can lose counts.  Tough! */
                return; /* Someone else is already on the job. */
        }
        if (relaxed && ULONG_CMP_GE(rsp->jiffies_force_qs, jiffies))
                goto unlock_fqs_ret; /* no emergency and done recently. */
        rsp->n_force_qs++;
-       spin_lock(&rnp->lock);  /* irqs already disabled */
+       raw_spin_lock(&rnp->lock);  /* irqs already disabled */
        rsp->jiffies_force_qs = jiffies + RCU_JIFFIES_TILL_FORCE_QS;
        if(!rcu_gp_in_progress(rsp)) {
                rsp->n_force_qs_ngp++;
-               spin_unlock(&rnp->lock);  /* irqs remain disabled */
+               raw_spin_unlock(&rnp->lock);  /* irqs remain disabled */
                goto unlock_fqs_ret;  /* no GP in progress, time updated. */
        }
        rsp->fqs_active = 1;
@@ -1235,13 +1235,13 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
 
        case RCU_SAVE_DYNTICK:
 
-               spin_unlock(&rnp->lock);  /* irqs remain disabled */
+               raw_spin_unlock(&rnp->lock);  /* irqs remain disabled */
                if (RCU_SIGNAL_INIT != RCU_SAVE_DYNTICK)
                        break; /* So gcc recognizes the dead code. */
 
                /* Record dyntick-idle state. */
                force_qs_rnp(rsp, dyntick_save_progress_counter);
-               spin_lock(&rnp->lock);  /* irqs already disabled */
+               raw_spin_lock(&rnp->lock);  /* irqs already disabled */
                if (rcu_gp_in_progress(rsp))
                        rsp->signaled = RCU_FORCE_QS;
                break;
@@ -1249,24 +1249,24 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
        case RCU_FORCE_QS:
 
                /* Check dyntick-idle state, send IPI to laggarts. */
-               spin_unlock(&rnp->lock);  /* irqs remain disabled */
+               raw_spin_unlock(&rnp->lock);  /* irqs remain disabled */
                force_qs_rnp(rsp, rcu_implicit_dynticks_qs);
 
                /* Leave state in case more forcing is required. */
 
-               spin_lock(&rnp->lock);  /* irqs already disabled */
+               raw_spin_lock(&rnp->lock);  /* irqs already disabled */
                break;
        }
        rsp->fqs_active = 0;
        if (rsp->fqs_need_gp) {
-               spin_unlock(&rsp->fqslock); /* irqs remain disabled */
+               raw_spin_unlock(&rsp->fqslock); /* irqs remain disabled */
                rsp->fqs_need_gp = 0;
                rcu_start_gp(rsp, flags); /* releases rnp->lock */
                return;
        }
-       spin_unlock(&rnp->lock);  /* irqs remain disabled */
+       raw_spin_unlock(&rnp->lock);  /* irqs remain disabled */
 unlock_fqs_ret:
-       spin_unlock_irqrestore(&rsp->fqslock, flags);
+       raw_spin_unlock_irqrestore(&rsp->fqslock, flags);
 }
 
 #else /* #ifdef CONFIG_SMP */
@@ -1308,7 +1308,7 @@ __rcu_process_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
 
        /* Does this CPU require a not-yet-started grace period? */
        if (cpu_needs_another_gp(rsp, rdp)) {
-               spin_lock_irqsave(&rcu_get_root(rsp)->lock, flags);
+               raw_spin_lock_irqsave(&rcu_get_root(rsp)->lock, flags);
                rcu_start_gp(rsp, flags);  /* releases above lock */
        }
 
@@ -1373,7 +1373,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
                unsigned long nestflag;
                struct rcu_node *rnp_root = rcu_get_root(rsp);
 
-               spin_lock_irqsave(&rnp_root->lock, nestflag);
+               raw_spin_lock_irqsave(&rnp_root->lock, nestflag);
                rcu_start_gp(rsp, nestflag);  /* releases rnp_root->lock. */
        }
 
@@ -1662,7 +1662,7 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
        struct rcu_node *rnp = rcu_get_root(rsp);
 
        /* Set up local state, ensuring consistent view of global state. */
-       spin_lock_irqsave(&rnp->lock, flags);
+       raw_spin_lock_irqsave(&rnp->lock, flags);
        rdp->grpmask = 1UL << (cpu - rdp->mynode->grplo);
        rdp->nxtlist = NULL;
        for (i = 0; i < RCU_NEXT_SIZE; i++)
@@ -1672,7 +1672,7 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
        rdp->dynticks = &per_cpu(rcu_dynticks, cpu);
 #endif /* #ifdef CONFIG_NO_HZ */
        rdp->cpu = cpu;
-       spin_unlock_irqrestore(&rnp->lock, flags);
+       raw_spin_unlock_irqrestore(&rnp->lock, flags);
 }
 
 /*
@@ -1690,7 +1690,7 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptable)
        struct rcu_node *rnp = rcu_get_root(rsp);
 
        /* Set up local state, ensuring consistent view of global state. */
-       spin_lock_irqsave(&rnp->lock, flags);
+       raw_spin_lock_irqsave(&rnp->lock, flags);
        rdp->passed_quiesc = 0;  /* We could be racing with new GP, */
        rdp->qs_pending = 1;     /*  so set up to respond to current GP. */
        rdp->beenonline = 1;     /* We have now been online. */
@@ -1698,7 +1698,7 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptable)
        rdp->qlen_last_fqs_check = 0;
        rdp->n_force_qs_snap = rsp->n_force_qs;
        rdp->blimit = blimit;
-       spin_unlock(&rnp->lock);                /* irqs remain disabled. */
+       raw_spin_unlock(&rnp->lock);            /* irqs remain disabled. */
 
        /*
         * A new grace period might start here.  If so, we won't be part
@@ -1706,14 +1706,14 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptable)
         */
 
        /* Exclude any attempts to start a new GP on large systems. */
-       spin_lock(&rsp->onofflock);             /* irqs already disabled. */
+       raw_spin_lock(&rsp->onofflock);         /* irqs already disabled. */
 
        /* Add CPU to rcu_node bitmasks. */
        rnp = rdp->mynode;
        mask = rdp->grpmask;
        do {
                /* Exclude any attempts to start a new GP on small systems. */
-               spin_lock(&rnp->lock);  /* irqs already disabled. */
+               raw_spin_lock(&rnp->lock);      /* irqs already disabled. */
                rnp->qsmaskinit |= mask;
                mask = rnp->grpmask;
                if (rnp == rdp->mynode) {
@@ -1721,11 +1721,11 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptable)
                        rdp->completed = rnp->completed;
                        rdp->passed_quiesc_completed = rnp->completed - 1;
                }
-               spin_unlock(&rnp->lock); /* irqs already disabled. */
+               raw_spin_unlock(&rnp->lock); /* irqs already disabled. */
                rnp = rnp->parent;
        } while (rnp != NULL && !(rnp->qsmaskinit & mask));
 
-       spin_unlock_irqrestore(&rsp->onofflock, flags);
+       raw_spin_unlock_irqrestore(&rsp->onofflock, flags);
 }
 
 static void __cpuinit rcu_online_cpu(int cpu)
@@ -1832,7 +1832,7 @@ static void __init rcu_init_one(struct rcu_state *rsp)
                cpustride *= rsp->levelspread[i];
                rnp = rsp->level[i];
                for (j = 0; j < rsp->levelcnt[i]; j++, rnp++) {
-                       spin_lock_init(&rnp->lock);
+                       raw_spin_lock_init(&rnp->lock);
                        lockdep_set_class_and_name(&rnp->lock,
                                                   &rcu_node_class[i], buf[i]);
                        rnp->gpnum = 0;
index 7495fed..6a82c34 100644 (file)
@@ -90,7 +90,7 @@ struct rcu_dynticks {
  * Definition for node within the RCU grace-period-detection hierarchy.
  */
 struct rcu_node {
-       spinlock_t lock;        /* Root rcu_node's lock protects some */
+       raw_spinlock_t lock;    /* Root rcu_node's lock protects some */
                                /*  rcu_state fields as well as following. */
        unsigned long gpnum;    /* Current grace period for this node. */
                                /*  This will either be equal to or one */
@@ -291,7 +291,7 @@ struct rcu_state {
 
        /* End of fields guarded by root rcu_node's lock. */
 
-       spinlock_t onofflock;                   /* exclude on/offline and */
+       raw_spinlock_t onofflock;               /* exclude on/offline and */
                                                /*  starting new GP.  Also */
                                                /*  protects the following */
                                                /*  orphan_cbs fields. */
@@ -301,7 +301,7 @@ struct rcu_state {
                                                /*  going offline. */
        struct rcu_head **orphan_cbs_tail;      /* And tail pointer. */
        long orphan_qlen;                       /* Number of orphaned cbs. */
-       spinlock_t fqslock;                     /* Only one task forcing */
+       raw_spinlock_t fqslock;                 /* Only one task forcing */
                                                /*  quiescent states. */
        unsigned long jiffies_force_qs;         /* Time at which to invoke */
                                                /*  force_quiescent_state(). */
index a825666..a8b2e83 100644 (file)
@@ -111,7 +111,7 @@ static void rcu_preempt_note_context_switch(int cpu)
                /* Possibly blocking in an RCU read-side critical section. */
                rdp = rcu_preempt_state.rda[cpu];
                rnp = rdp->mynode;
-               spin_lock_irqsave(&rnp->lock, flags);
+               raw_spin_lock_irqsave(&rnp->lock, flags);
                t->rcu_read_unlock_special |= RCU_READ_UNLOCK_BLOCKED;
                t->rcu_blocked_node = rnp;
 
@@ -132,7 +132,7 @@ static void rcu_preempt_note_context_switch(int cpu)
                WARN_ON_ONCE(!list_empty(&t->rcu_node_entry));
                phase = (rnp->gpnum + !(rnp->qsmask & rdp->grpmask)) & 0x1;
                list_add(&t->rcu_node_entry, &rnp->blocked_tasks[phase]);
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
        }
 
        /*
@@ -189,7 +189,7 @@ static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp, unsigned long flags)
        struct rcu_node *rnp_p;
 
        if (rnp->qsmask != 0 || rcu_preempted_readers(rnp)) {
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
                return;  /* Still need more quiescent states! */
        }
 
@@ -206,8 +206,8 @@ static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp, unsigned long flags)
 
        /* Report up the rest of the hierarchy. */
        mask = rnp->grpmask;
-       spin_unlock(&rnp->lock);        /* irqs remain disabled. */
-       spin_lock(&rnp_p->lock);        /* irqs already disabled. */
+       raw_spin_unlock(&rnp->lock);    /* irqs remain disabled. */
+       raw_spin_lock(&rnp_p->lock);    /* irqs already disabled. */
        rcu_report_qs_rnp(mask, &rcu_preempt_state, rnp_p, flags);
 }
 
@@ -257,10 +257,10 @@ static void rcu_read_unlock_special(struct task_struct *t)
                 */
                for (;;) {
                        rnp = t->rcu_blocked_node;
-                       spin_lock(&rnp->lock);  /* irqs already disabled. */
+                       raw_spin_lock(&rnp->lock);  /* irqs already disabled. */
                        if (rnp == t->rcu_blocked_node)
                                break;
-                       spin_unlock(&rnp->lock);  /* irqs remain disabled. */
+                       raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */
                }
                empty = !rcu_preempted_readers(rnp);
                empty_exp = !rcu_preempted_readers_exp(rnp);
@@ -274,7 +274,7 @@ static void rcu_read_unlock_special(struct task_struct *t)
                 * Note that rcu_report_unblock_qs_rnp() releases rnp->lock.
                 */
                if (empty)
-                       spin_unlock_irqrestore(&rnp->lock, flags);
+                       raw_spin_unlock_irqrestore(&rnp->lock, flags);
                else
                        rcu_report_unblock_qs_rnp(rnp, flags);
 
@@ -324,12 +324,12 @@ static void rcu_print_task_stall(struct rcu_node *rnp)
        struct task_struct *t;
 
        if (rcu_preempted_readers(rnp)) {
-               spin_lock_irqsave(&rnp->lock, flags);
+               raw_spin_lock_irqsave(&rnp->lock, flags);
                phase = rnp->gpnum & 0x1;
                lp = &rnp->blocked_tasks[phase];
                list_for_each_entry(t, lp, rcu_node_entry)
                        printk(" P%d", t->pid);
-               spin_unlock_irqrestore(&rnp->lock, flags);
+               raw_spin_unlock_irqrestore(&rnp->lock, flags);
        }
 }
 
@@ -400,11 +400,11 @@ static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
                lp_root = &rnp_root->blocked_tasks[i];
                while (!list_empty(lp)) {
                        tp = list_entry(lp->next, typeof(*tp), rcu_node_entry);
-                       spin_lock(&rnp_root->lock); /* irqs already disabled */
+                       raw_spin_lock(&rnp_root->lock); /* irqs already disabled */
                        list_del(&tp->rcu_node_entry);
                        tp->rcu_blocked_node = rnp_root;
                        list_add(&tp->rcu_node_entry, lp_root);
-                       spin_unlock(&rnp_root->lock); /* irqs remain disabled */
+                       raw_spin_unlock(&rnp_root->lock); /* irqs remain disabled */
                }
        }
        return retval;
@@ -528,7 +528,7 @@ static void rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp)
        unsigned long flags;
        unsigned long mask;
 
-       spin_lock_irqsave(&rnp->lock, flags);
+       raw_spin_lock_irqsave(&rnp->lock, flags);
        for (;;) {
                if (!sync_rcu_preempt_exp_done(rnp))
                        break;
@@ -537,12 +537,12 @@ static void rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp)
                        break;
                }
                mask = rnp->grpmask;
-               spin_unlock(&rnp->lock); /* irqs remain disabled */
+               raw_spin_unlock(&rnp->lock); /* irqs remain disabled */
                rnp = rnp->parent;
-               spin_lock(&rnp->lock); /* irqs already disabled */
+               raw_spin_lock(&rnp->lock); /* irqs already disabled */
                rnp->expmask &= ~mask;
        }
-       spin_unlock_irqrestore(&rnp->lock, flags);
+       raw_spin_unlock_irqrestore(&rnp->lock, flags);
 }
 
 /*
@@ -557,11 +557,11 @@ sync_rcu_preempt_exp_init(struct rcu_state *rsp, struct rcu_node *rnp)
 {
        int must_wait;
 
-       spin_lock(&rnp->lock); /* irqs already disabled */
+       raw_spin_lock(&rnp->lock); /* irqs already disabled */
        list_splice_init(&rnp->blocked_tasks[0], &rnp->blocked_tasks[2]);
        list_splice_init(&rnp->blocked_tasks[1], &rnp->blocked_tasks[3]);
        must_wait = rcu_preempted_readers_exp(rnp);
-       spin_unlock(&rnp->lock); /* irqs remain disabled */
+       raw_spin_unlock(&rnp->lock); /* irqs remain disabled */
        if (!must_wait)
                rcu_report_exp_rnp(rsp, rnp);
 }
@@ -606,13 +606,13 @@ void synchronize_rcu_expedited(void)
        /* force all RCU readers onto blocked_tasks[]. */
        synchronize_sched_expedited();
 
-       spin_lock_irqsave(&rsp->onofflock, flags);
+       raw_spin_lock_irqsave(&rsp->onofflock, flags);
 
        /* Initialize ->expmask for all non-leaf rcu_node structures. */
        rcu_for_each_nonleaf_node_breadth_first(rsp, rnp) {
-               spin_lock(&rnp->lock); /* irqs already disabled. */
+               raw_spin_lock(&rnp->lock); /* irqs already disabled. */
                rnp->expmask = rnp->qsmaskinit;
-               spin_unlock(&rnp->lock); /* irqs remain disabled. */
+               raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */
        }
 
        /* Snapshot current state of ->blocked_tasks[] lists. */
@@ -621,7 +621,7 @@ void synchronize_rcu_expedited(void)
        if (NUM_RCU_NODES > 1)
                sync_rcu_preempt_exp_init(rsp, rcu_get_root(rsp));
 
-       spin_unlock_irqrestore(&rsp->onofflock, flags);
+       raw_spin_unlock_irqrestore(&rsp->onofflock, flags);
 
        /* Wait for snapshotted ->blocked_tasks[] lists to drain. */
        rnp = rcu_get_root(rsp);
@@ -756,7 +756,7 @@ static int rcu_preempted_readers(struct rcu_node *rnp)
 /* Because preemptible RCU does not exist, no quieting of tasks. */
 static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp, unsigned long flags)
 {
-       spin_unlock_irqrestore(&rnp->lock, flags);
+       raw_spin_unlock_irqrestore(&rnp->lock, flags);
 }
 
 #endif /* #ifdef CONFIG_HOTPLUG_CPU */