/*
* Record the start of an expedited grace period.
*/
-static void rcu_exp_gp_seq_start(struct rcu_state *rsp)
+static void rcu_exp_gp_seq_start(void)
{
- rcu_seq_start(&rsp->expedited_sequence);
+ rcu_seq_start(&rcu_state.expedited_sequence);
}
/*
* Return then value that expedited-grace-period counter will have
* at the end of the current grace period.
*/
-static __maybe_unused unsigned long rcu_exp_gp_seq_endval(struct rcu_state *rsp)
+static __maybe_unused unsigned long rcu_exp_gp_seq_endval(void)
{
- return rcu_seq_endval(&rsp->expedited_sequence);
+ return rcu_seq_endval(&rcu_state.expedited_sequence);
}
/*
* Record the end of an expedited grace period.
*/
-static void rcu_exp_gp_seq_end(struct rcu_state *rsp)
+static void rcu_exp_gp_seq_end(void)
{
- rcu_seq_end(&rsp->expedited_sequence);
+ rcu_seq_end(&rcu_state.expedited_sequence);
smp_mb(); /* Ensure that consecutive grace periods serialize. */
}
/*
* Take a snapshot of the expedited-grace-period counter.
*/
-static unsigned long rcu_exp_gp_seq_snap(struct rcu_state *rsp)
+static unsigned long rcu_exp_gp_seq_snap(void)
{
unsigned long s;
smp_mb(); /* Caller's modifications seen first by other CPUs. */
- s = rcu_seq_snap(&rsp->expedited_sequence);
- trace_rcu_exp_grace_period(rsp->name, s, TPS("snap"));
+ s = rcu_seq_snap(&rcu_state.expedited_sequence);
+ trace_rcu_exp_grace_period(rcu_state.name, s, TPS("snap"));
return s;
}
* if a full expedited grace period has elapsed since that snapshot
* was taken.
*/
-static bool rcu_exp_gp_seq_done(struct rcu_state *rsp, unsigned long s)
+static bool rcu_exp_gp_seq_done(unsigned long s)
{
- return rcu_seq_done(&rsp->expedited_sequence, s);
+ return rcu_seq_done(&rcu_state.expedited_sequence, s);
}
/*
* ever been online. This means that this function normally takes its
* no-work-to-do fastpath.
*/
-static void sync_exp_reset_tree_hotplug(struct rcu_state *rsp)
+static void sync_exp_reset_tree_hotplug(void)
{
bool done;
unsigned long flags;
unsigned long mask;
unsigned long oldmask;
- int ncpus = smp_load_acquire(&rsp->ncpus); /* Order against locking. */
+ int ncpus = smp_load_acquire(&rcu_state.ncpus); /* Order vs. locking. */
struct rcu_node *rnp;
struct rcu_node *rnp_up;
/* If no new CPUs onlined since last time, nothing to do. */
- if (likely(ncpus == rsp->ncpus_snap))
+ if (likely(ncpus == rcu_state.ncpus_snap))
return;
- rsp->ncpus_snap = ncpus;
+ rcu_state.ncpus_snap = ncpus;
/*
* Each pass through the following loop propagates newly onlined
* CPUs for the current rcu_node structure up the rcu_node tree.
*/
- rcu_for_each_leaf_node(rsp, rnp) {
+ rcu_for_each_leaf_node(&rcu_state, rnp) {
raw_spin_lock_irqsave_rcu_node(rnp, flags);
if (rnp->expmaskinit == rnp->expmaskinitnext) {
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
* Reset the ->expmask values in the rcu_node tree in preparation for
* a new expedited grace period.
*/
-static void __maybe_unused sync_exp_reset_tree(struct rcu_state *rsp)
+static void __maybe_unused sync_exp_reset_tree(void)
{
unsigned long flags;
struct rcu_node *rnp;
- sync_exp_reset_tree_hotplug(rsp);
- rcu_for_each_node_breadth_first(rsp, rnp) {
+ sync_exp_reset_tree_hotplug();
+ rcu_for_each_node_breadth_first(&rcu_state, rnp) {
raw_spin_lock_irqsave_rcu_node(rnp, flags);
WARN_ON_ONCE(rnp->expmask);
rnp->expmask = rnp->expmaskinit;
*
* Caller must hold the specified rcu_node structure's ->lock.
*/
-static void __rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp,
+static void __rcu_report_exp_rnp(struct rcu_node *rnp,
bool wake, unsigned long flags)
__releases(rnp->lock)
{
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
if (wake) {
smp_mb(); /* EGP done before wake_up(). */
- swake_up_one(&rsp->expedited_wq);
+ swake_up_one(&rcu_state.expedited_wq);
}
break;
}
* Report expedited quiescent state for specified node. This is a
* lock-acquisition wrapper function for __rcu_report_exp_rnp().
*/
-static void __maybe_unused rcu_report_exp_rnp(struct rcu_state *rsp,
- struct rcu_node *rnp, bool wake)
+static void __maybe_unused rcu_report_exp_rnp(struct rcu_node *rnp, bool wake)
{
unsigned long flags;
raw_spin_lock_irqsave_rcu_node(rnp, flags);
- __rcu_report_exp_rnp(rsp, rnp, wake, flags);
+ __rcu_report_exp_rnp(rnp, wake, flags);
}
/*
* Report expedited quiescent state for multiple CPUs, all covered by the
* specified leaf rcu_node structure.
*/
-static void rcu_report_exp_cpu_mult(struct rcu_state *rsp, struct rcu_node *rnp,
+static void rcu_report_exp_cpu_mult(struct rcu_node *rnp,
unsigned long mask, bool wake)
{
unsigned long flags;
return;
}
rnp->expmask &= ~mask;
- __rcu_report_exp_rnp(rsp, rnp, wake, flags); /* Releases rnp->lock. */
+ __rcu_report_exp_rnp(rnp, wake, flags); /* Releases rnp->lock. */
}
/*
* Report expedited quiescent state for specified rcu_data (CPU).
*/
-static void rcu_report_exp_rdp(struct rcu_state *rsp, struct rcu_data *rdp)
+static void rcu_report_exp_rdp(struct rcu_data *rdp)
{
WRITE_ONCE(rdp->deferred_qs, false);
- rcu_report_exp_cpu_mult(rsp, rdp->mynode, rdp->grpmask, true);
+ rcu_report_exp_cpu_mult(rdp->mynode, rdp->grpmask, true);
}
/* Common code for work-done checking. */
-static bool sync_exp_work_done(struct rcu_state *rsp, unsigned long s)
+static bool sync_exp_work_done(unsigned long s)
{
- if (rcu_exp_gp_seq_done(rsp, s)) {
- trace_rcu_exp_grace_period(rsp->name, s, TPS("done"));
+ if (rcu_exp_gp_seq_done(s)) {
+ trace_rcu_exp_grace_period(rcu_state.name, s, TPS("done"));
/* Ensure test happens before caller kfree(). */
smp_mb__before_atomic(); /* ^^^ */
return true;
* with the mutex held, indicating that the caller must actually do the
* expedited grace period.
*/
-static bool exp_funnel_lock(struct rcu_state *rsp, unsigned long s)
+static bool exp_funnel_lock(unsigned long s)
{
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, raw_smp_processor_id());
struct rcu_node *rnp = rdp->mynode;
if (ULONG_CMP_LT(READ_ONCE(rnp->exp_seq_rq), s) &&
(rnp == rnp_root ||
ULONG_CMP_LT(READ_ONCE(rnp_root->exp_seq_rq), s)) &&
- mutex_trylock(&rsp->exp_mutex))
+ mutex_trylock(&rcu_state.exp_mutex))
goto fastpath;
/*
* Each pass through the following loop works its way up
* the rcu_node tree, returning if others have done the work or
- * otherwise falls through to acquire rsp->exp_mutex. The mapping
+ * otherwise falls through to acquire ->exp_mutex. The mapping
* from CPU to rcu_node structure can be inexact, as it is just
* promoting locality and is not strictly needed for correctness.
*/
for (; rnp != NULL; rnp = rnp->parent) {
- if (sync_exp_work_done(rsp, s))
+ if (sync_exp_work_done(s))
return true;
/* Work not done, either wait here or go up. */
/* Someone else doing GP, so wait for them. */
spin_unlock(&rnp->exp_lock);
- trace_rcu_exp_funnel_lock(rsp->name, rnp->level,
+ trace_rcu_exp_funnel_lock(rcu_state.name, rnp->level,
rnp->grplo, rnp->grphi,
TPS("wait"));
wait_event(rnp->exp_wq[rcu_seq_ctr(s) & 0x3],
- sync_exp_work_done(rsp, s));
+ sync_exp_work_done(s));
return true;
}
rnp->exp_seq_rq = s; /* Followers can wait on us. */
spin_unlock(&rnp->exp_lock);
- trace_rcu_exp_funnel_lock(rsp->name, rnp->level, rnp->grplo,
- rnp->grphi, TPS("nxtlvl"));
+ trace_rcu_exp_funnel_lock(rcu_state.name, rnp->level,
+ rnp->grplo, rnp->grphi, TPS("nxtlvl"));
}
- mutex_lock(&rsp->exp_mutex);
+ mutex_lock(&rcu_state.exp_mutex);
fastpath:
- if (sync_exp_work_done(rsp, s)) {
- mutex_unlock(&rsp->exp_mutex);
+ if (sync_exp_work_done(s)) {
+ mutex_unlock(&rcu_state.exp_mutex);
return true;
}
- rcu_exp_gp_seq_start(rsp);
- trace_rcu_exp_grace_period(rsp->name, s, TPS("start"));
+ rcu_exp_gp_seq_start();
+ trace_rcu_exp_grace_period(rcu_state.name, s, TPS("start"));
return false;
}
struct rcu_exp_work *rewp =
container_of(wp, struct rcu_exp_work, rew_work);
struct rcu_node *rnp = container_of(rewp, struct rcu_node, rew);
- struct rcu_state *rsp = rewp->rew_rsp;
func = rewp->rew_func;
raw_spin_lock_irqsave_rcu_node(rnp, flags);
mask_ofl_test |= mask;
continue;
}
- ret = smp_call_function_single(cpu, func, rsp, 0);
+ ret = smp_call_function_single(cpu, func, NULL, 0);
if (!ret) {
mask_ofl_ipi &= ~mask;
continue;
(rnp->expmask & mask)) {
/* Online, so delay for a bit and try again. */
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
- trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("selectofl"));
+ trace_rcu_exp_grace_period(rcu_state.name, rcu_exp_gp_seq_endval(), TPS("selectofl"));
schedule_timeout_uninterruptible(1);
goto retry_ipi;
}
/* Report quiescent states for those that went offline. */
mask_ofl_test |= mask_ofl_ipi;
if (mask_ofl_test)
- rcu_report_exp_cpu_mult(rsp, rnp, mask_ofl_test, false);
+ rcu_report_exp_cpu_mult(rnp, mask_ofl_test, false);
}
/*
* Select the nodes that the upcoming expedited grace period needs
* to wait for.
*/
-static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
- smp_call_func_t func)
+static void sync_rcu_exp_select_cpus(smp_call_func_t func)
{
int cpu;
struct rcu_node *rnp;
- trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("reset"));
- sync_exp_reset_tree(rsp);
- trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("select"));
+ trace_rcu_exp_grace_period(rcu_state.name, rcu_exp_gp_seq_endval(), TPS("reset"));
+ sync_exp_reset_tree();
+ trace_rcu_exp_grace_period(rcu_state.name, rcu_exp_gp_seq_endval(), TPS("select"));
/* Schedule work for each leaf rcu_node structure. */
- rcu_for_each_leaf_node(rsp, rnp) {
+ rcu_for_each_leaf_node(&rcu_state, rnp) {
rnp->exp_need_flush = false;
if (!READ_ONCE(rnp->expmask))
continue; /* Avoid early boot non-existent wq. */
rnp->rew.rew_func = func;
- rnp->rew.rew_rsp = rsp;
if (!READ_ONCE(rcu_par_gp_wq) ||
rcu_scheduler_active != RCU_SCHEDULER_RUNNING ||
- rcu_is_last_leaf_node(rsp, rnp)) {
+ rcu_is_last_leaf_node(&rcu_state, rnp)) {
/* No workqueues yet or last leaf, do direct call. */
sync_rcu_exp_select_node_cpus(&rnp->rew.rew_work);
continue;
}
/* Wait for workqueue jobs (if any) to complete. */
- rcu_for_each_leaf_node(rsp, rnp)
+ rcu_for_each_leaf_node(&rcu_state, rnp)
if (rnp->exp_need_flush)
flush_work(&rnp->rew.rew_work);
}
-static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
+static void synchronize_sched_expedited_wait(void)
{
int cpu;
unsigned long jiffies_stall;
struct rcu_node *rnp_root = rcu_get_root();
int ret;
- trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("startwait"));
+ trace_rcu_exp_grace_period(rcu_state.name, rcu_exp_gp_seq_endval(), TPS("startwait"));
jiffies_stall = rcu_jiffies_till_stall_check();
jiffies_start = jiffies;
for (;;) {
ret = swait_event_timeout_exclusive(
- rsp->expedited_wq,
+ rcu_state.expedited_wq,
sync_rcu_preempt_exp_done_unlocked(rnp_root),
jiffies_stall);
if (ret > 0 || sync_rcu_preempt_exp_done_unlocked(rnp_root))
continue;
panic_on_rcu_stall();
pr_err("INFO: %s detected expedited stalls on CPUs/tasks: {",
- rsp->name);
+ rcu_state.name);
ndetected = 0;
- rcu_for_each_leaf_node(rsp, rnp) {
+ rcu_for_each_leaf_node(&rcu_state, rnp) {
ndetected += rcu_print_task_exp_stall(rnp);
for_each_leaf_node_possible_cpu(rnp, cpu) {
struct rcu_data *rdp;
}
}
pr_cont(" } %lu jiffies s: %lu root: %#lx/%c\n",
- jiffies - jiffies_start, rsp->expedited_sequence,
+ jiffies - jiffies_start, rcu_state.expedited_sequence,
rnp_root->expmask, ".T"[!!rnp_root->exp_tasks]);
if (ndetected) {
pr_err("blocking rcu_node structures:");
- rcu_for_each_node_breadth_first(rsp, rnp) {
+ rcu_for_each_node_breadth_first(&rcu_state, rnp) {
if (rnp == rnp_root)
continue; /* printed unconditionally */
if (sync_rcu_preempt_exp_done_unlocked(rnp))
}
pr_cont("\n");
}
- rcu_for_each_leaf_node(rsp, rnp) {
+ rcu_for_each_leaf_node(&rcu_state, rnp) {
for_each_leaf_node_possible_cpu(rnp, cpu) {
mask = leaf_node_cpu_bit(rnp, cpu);
if (!(rnp->expmask & mask))
* grace period. Also update all the ->exp_seq_rq counters as needed
* in order to avoid counter-wrap problems.
*/
-static void rcu_exp_wait_wake(struct rcu_state *rsp, unsigned long s)
+static void rcu_exp_wait_wake(unsigned long s)
{
struct rcu_node *rnp;
- synchronize_sched_expedited_wait(rsp);
- rcu_exp_gp_seq_end(rsp);
- trace_rcu_exp_grace_period(rsp->name, s, TPS("end"));
+ synchronize_sched_expedited_wait();
+ rcu_exp_gp_seq_end();
+ trace_rcu_exp_grace_period(rcu_state.name, s, TPS("end"));
/*
* Switch over to wakeup mode, allowing the next GP, but -only- the
* next GP, to proceed.
*/
- mutex_lock(&rsp->exp_wake_mutex);
+ mutex_lock(&rcu_state.exp_wake_mutex);
- rcu_for_each_node_breadth_first(rsp, rnp) {
+ rcu_for_each_node_breadth_first(&rcu_state, rnp) {
if (ULONG_CMP_LT(READ_ONCE(rnp->exp_seq_rq), s)) {
spin_lock(&rnp->exp_lock);
/* Recheck, avoid hang in case someone just arrived. */
spin_unlock(&rnp->exp_lock);
}
smp_mb(); /* All above changes before wakeup. */
- wake_up_all(&rnp->exp_wq[rcu_seq_ctr(rsp->expedited_sequence) & 0x3]);
+ wake_up_all(&rnp->exp_wq[rcu_seq_ctr(rcu_state.expedited_sequence) & 0x3]);
}
- trace_rcu_exp_grace_period(rsp->name, s, TPS("endwake"));
- mutex_unlock(&rsp->exp_wake_mutex);
+ trace_rcu_exp_grace_period(rcu_state.name, s, TPS("endwake"));
+ mutex_unlock(&rcu_state.exp_wake_mutex);
}
/*
* Common code to drive an expedited grace period forward, used by
* workqueues and mid-boot-time tasks.
*/
-static void rcu_exp_sel_wait_wake(struct rcu_state *rsp,
- smp_call_func_t func, unsigned long s)
+static void rcu_exp_sel_wait_wake(smp_call_func_t func, unsigned long s)
{
/* Initialize the rcu_node tree in preparation for the wait. */
- sync_rcu_exp_select_cpus(rsp, func);
+ sync_rcu_exp_select_cpus(func);
/* Wait and clean up, including waking everyone. */
- rcu_exp_wait_wake(rsp, s);
+ rcu_exp_wait_wake(s);
}
/*
struct rcu_exp_work *rewp;
rewp = container_of(wp, struct rcu_exp_work, rew_work);
- rcu_exp_sel_wait_wake(rewp->rew_rsp, rewp->rew_func, rewp->rew_s);
+ rcu_exp_sel_wait_wake(rewp->rew_func, rewp->rew_s);
}
/*
* Given an rcu_state pointer and a smp_call_function() handler, kick
* off the specified flavor of expedited grace period.
*/
-static void _synchronize_rcu_expedited(struct rcu_state *rsp,
- smp_call_func_t func)
+static void _synchronize_rcu_expedited(smp_call_func_t func)
{
struct rcu_data *rdp;
struct rcu_exp_work rew;
}
/* Take a snapshot of the sequence number. */
- s = rcu_exp_gp_seq_snap(rsp);
- if (exp_funnel_lock(rsp, s))
+ s = rcu_exp_gp_seq_snap();
+ if (exp_funnel_lock(s))
return; /* Someone else did our work for us. */
/* Ensure that load happens before action based on it. */
if (unlikely(rcu_scheduler_active == RCU_SCHEDULER_INIT)) {
/* Direct call during scheduler init and early_initcalls(). */
- rcu_exp_sel_wait_wake(rsp, func, s);
+ rcu_exp_sel_wait_wake(func, s);
} else {
/* Marshall arguments & schedule the expedited grace period. */
rew.rew_func = func;
- rew.rew_rsp = rsp;
rew.rew_s = s;
INIT_WORK_ONSTACK(&rew.rew_work, wait_rcu_exp_gp);
queue_work(rcu_gp_wq, &rew.rew_work);
rdp = per_cpu_ptr(&rcu_data, raw_smp_processor_id());
rnp = rcu_get_root();
wait_event(rnp->exp_wq[rcu_seq_ctr(s) & 0x3],
- sync_exp_work_done(rsp, s));
+ sync_exp_work_done(s));
smp_mb(); /* Workqueue actions happen before return. */
/* Let the next expedited grace period start. */
- mutex_unlock(&rsp->exp_mutex);
+ mutex_unlock(&rcu_state.exp_mutex);
}
#ifdef CONFIG_PREEMPT_RCU
* ->expmask fields in the rcu_node tree. Otherwise, immediately
* report the quiescent state.
*/
-static void sync_rcu_exp_handler(void *info)
+static void sync_rcu_exp_handler(void *unused)
{
unsigned long flags;
- struct rcu_state *rsp = info;
struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
struct rcu_node *rnp = rdp->mynode;
struct task_struct *t = current;
if (!t->rcu_read_lock_nesting) {
if (!(preempt_count() & (PREEMPT_MASK | SOFTIRQ_MASK)) ||
rcu_dynticks_curr_cpu_in_eqs()) {
- rcu_report_exp_rdp(rsp, rdp);
+ rcu_report_exp_rdp(rdp);
} else {
rdp->deferred_qs = true;
resched_cpu(rdp->cpu);
*/
void synchronize_rcu_expedited(void)
{
- struct rcu_state *rsp = &rcu_state;
-
RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map) ||
lock_is_held(&rcu_lock_map) ||
lock_is_held(&rcu_sched_lock_map),
if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE)
return;
- _synchronize_rcu_expedited(rsp, sync_rcu_exp_handler);
+ _synchronize_rcu_expedited(sync_rcu_exp_handler);
}
EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
__this_cpu_read(rcu_data.cpu_no_qs.b.exp))
return;
if (rcu_is_cpu_rrupt_from_idle()) {
- rcu_report_exp_rdp(&rcu_state, this_cpu_ptr(&rcu_data));
+ rcu_report_exp_rdp(this_cpu_ptr(&rcu_data));
return;
}
__this_cpu_write(rcu_data.cpu_no_qs.b.exp, true);
struct rcu_data *rdp;
int ret;
struct rcu_node *rnp;
- struct rcu_state *rsp = &rcu_state;
rdp = per_cpu_ptr(&rcu_data, cpu);
rnp = rdp->mynode;
if (!(READ_ONCE(rnp->expmask) & rdp->grpmask))
return;
- ret = smp_call_function_single(cpu, sync_sched_exp_handler, rsp, 0);
+ ret = smp_call_function_single(cpu, sync_sched_exp_handler, NULL, 0);
WARN_ON_ONCE(ret);
}
/* PREEMPT=n implementation of synchronize_rcu_expedited(). */
void synchronize_rcu_expedited(void)
{
- struct rcu_state *rsp = &rcu_state;
-
RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map) ||
lock_is_held(&rcu_lock_map) ||
lock_is_held(&rcu_sched_lock_map),
if (rcu_blocking_is_gp())
return;
- _synchronize_rcu_expedited(rsp, sync_sched_exp_handler);
+ _synchronize_rcu_expedited(sync_sched_exp_handler);
}
EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
projects / platform / kernel / linux-starfive.git / commitdiff