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Date: Wed, 17 Feb 2010 09:02:49 -0800
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch -tip/core/rcu] rcu: Convert to raw_spinlocks
On Wed, Feb 17, 2010 at 04:23:00PM -0000, Thomas Gleixner wrote:
> The spinlocks in rcutree need to be real spinlocks in
> preempt-rt. Convert them to raw_spinlocks.
Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Except that it conflicts with some of my patch stack. So I will apply
this on top of my stack and re-send, if that is OK.
Thanx, Paul
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
> kernel/rcutree.c | 132 ++++++++++++++++++++++++------------------------
> kernel/rcutree.h | 6 +-
> kernel/rcutree_plugin.h | 46 ++++++++--------
> 3 files changed, 92 insertions(+), 92 deletions(-)
>
> Index: linux-2.6-tip/kernel/rcutree.c
> ===================================================================
> --- linux-2.6-tip.orig/kernel/rcutree.c
> +++ linux-2.6-tip/kernel/rcutree.c
> @@ -66,11 +66,11 @@ static struct lock_class_key rcu_node_cl
> .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
>
> /* 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
> * 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_s
> 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 ((long)(jiffies - rsp->jiffies_stall) >= 0)
> 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_st
> 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, retry 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
> 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, retry 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, unsi
> 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, unsi
> * 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, unsi
> 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, unsi
> * 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, st
> 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, st
>
> 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_st
> 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_st
> * 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(st
>
> 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(st
> 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
> 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
> 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, s
> 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, s
> * 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_stat
>
> 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_stat
> rcu_report_qs_rnp(mask, rsp, rnp, flags);
> continue;
> }
> - spin_unlock_irqrestore(&rnp->lock, flags);
> + raw_spin_unlock_irqrestore(&rnp->lock, flags);
> }
> }
>
> @@ -1212,7 +1212,7 @@ static void force_quiescent_state(struct
>
> 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. */
> }
> @@ -1220,11 +1220,11 @@ static void force_quiescent_state(struct
> (long)(rsp->jiffies_force_qs - jiffies) >= 0)
> 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;
> @@ -1236,13 +1236,13 @@ static void force_quiescent_state(struct
>
> 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;
> @@ -1250,24 +1250,24 @@ static void force_quiescent_state(struct
> 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 */
> @@ -1309,7 +1309,7 @@ __rcu_process_callbacks(struct rcu_state
>
> /* 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 */
> }
>
> @@ -1374,7 +1374,7 @@ __call_rcu(struct rcu_head *head, void (
> 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. */
> }
>
> @@ -1664,7 +1664,7 @@ rcu_boot_init_percpu_data(int cpu, struc
> 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++)
> @@ -1674,7 +1674,7 @@ rcu_boot_init_percpu_data(int cpu, struc
> 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);
> }
>
> /*
> @@ -1692,7 +1692,7 @@ rcu_init_percpu_data(int cpu, struct rcu
> 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. */
> @@ -1700,7 +1700,7 @@ rcu_init_percpu_data(int cpu, struct rcu
> 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
> @@ -1708,14 +1708,14 @@ rcu_init_percpu_data(int cpu, struct rcu
> */
>
> /* 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) {
> @@ -1723,11 +1723,11 @@ rcu_init_percpu_data(int cpu, struct rcu
> 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)
> @@ -1834,7 +1834,7 @@ static void __init rcu_init_one(struct r
> 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: linux-2.6-tip/kernel/rcutree.h
> ===================================================================
> --- linux-2.6-tip.orig/kernel/rcutree.h
> +++ linux-2.6-tip/kernel/rcutree.h
> @@ -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. */
> long gpnum; /* Current grace period for this node. */
> /* This will either be equal to or one */
> @@ -288,7 +288,7 @@ 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. */
> @@ -298,7 +298,7 @@ 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: linux-2.6-tip/kernel/rcutree_plugin.h
> ===================================================================
> --- linux-2.6-tip.orig/kernel/rcutree_plugin.h
> +++ linux-2.6-tip/kernel/rcutree_plugin.h
> @@ -111,7 +111,7 @@ static void rcu_preempt_note_context_swi
> /* 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_swi
> 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(st
> 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(st
>
> /* 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(stru
> */
> 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(stru
> * 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
> 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(str
> 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 rc
> 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 rc
> 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_sta
> {
> 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
> /* 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 */
>
>
--
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