[PATCH v8 -tip 01/26] sched: Wrap rq::lock access

From: Joel Fernandes (Google)
Date: Mon Oct 19 2020 - 21:43:52 EST

From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>

In preparation of playing games with rq->lock, abstract the thing
using an accessor.

Tested-by: Julien Desfossez <jdesfossez@xxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Vineeth Remanan Pillai <vpillai@xxxxxxxxxxxxxxxx>
Signed-off-by: Julien Desfossez <jdesfossez@xxxxxxxxxxxxxxxx>
---
kernel/sched/core.c | 46 +++++++++---------
kernel/sched/cpuacct.c | 12 ++---
kernel/sched/deadline.c | 18 +++----
kernel/sched/debug.c | 4 +-
kernel/sched/fair.c | 38 +++++++--------
kernel/sched/idle.c | 4 +-
kernel/sched/pelt.h | 2 +-
kernel/sched/rt.c | 8 +--
kernel/sched/sched.h | 105 +++++++++++++++++++++-------------------
kernel/sched/topology.c | 4 +-
10 files changed, 122 insertions(+), 119 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d2003a7d5ab5..97181b3d12eb 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -186,12 +186,12 @@ struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)

for (;;) {
rq = task_rq(p);
- raw_spin_lock(&rq->lock);
+ raw_spin_lock(rq_lockp(rq));
if (likely(rq == task_rq(p) && !task_on_rq_migrating(p))) {
rq_pin_lock(rq, rf);
return rq;
}
- raw_spin_unlock(&rq->lock);
+ raw_spin_unlock(rq_lockp(rq));

while (unlikely(task_on_rq_migrating(p)))
cpu_relax();
@@ -210,7 +210,7 @@ struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
for (;;) {
raw_spin_lock_irqsave(&p->pi_lock, rf->flags);
rq = task_rq(p);
- raw_spin_lock(&rq->lock);
+ raw_spin_lock(rq_lockp(rq));
/*
* move_queued_task() task_rq_lock()
*
@@ -232,7 +232,7 @@ struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
rq_pin_lock(rq, rf);
return rq;
}
- raw_spin_unlock(&rq->lock);
+ raw_spin_unlock(rq_lockp(rq));
raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);

while (unlikely(task_on_rq_migrating(p)))
@@ -302,7 +302,7 @@ void update_rq_clock(struct rq *rq)
{
s64 delta;

- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

if (rq->clock_update_flags & RQCF_ACT_SKIP)
return;
@@ -611,7 +611,7 @@ void resched_curr(struct rq *rq)
struct task_struct *curr = rq->curr;
int cpu;

- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

if (test_tsk_need_resched(curr))
return;
@@ -635,10 +635,10 @@ void resched_cpu(int cpu)
struct rq *rq = cpu_rq(cpu);
unsigned long flags;

- raw_spin_lock_irqsave(&rq->lock, flags);
+ raw_spin_lock_irqsave(rq_lockp(rq), flags);
if (cpu_online(cpu) || cpu == smp_processor_id())
resched_curr(rq);
- raw_spin_unlock_irqrestore(&rq->lock, flags);
+ raw_spin_unlock_irqrestore(rq_lockp(rq), flags);
}

#ifdef CONFIG_SMP
@@ -1137,7 +1137,7 @@ static inline void uclamp_rq_inc_id(struct rq *rq, struct task_struct *p,
struct uclamp_se *uc_se = &p->uclamp[clamp_id];
struct uclamp_bucket *bucket;

- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

/* Update task effective clamp */
p->uclamp[clamp_id] = uclamp_eff_get(p, clamp_id);
@@ -1177,7 +1177,7 @@ static inline void uclamp_rq_dec_id(struct rq *rq, struct task_struct *p,
unsigned int bkt_clamp;
unsigned int rq_clamp;

- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

/*
* If sched_uclamp_used was enabled after task @p was enqueued,
@@ -1733,7 +1733,7 @@ static inline bool is_cpu_allowed(struct task_struct *p, int cpu)
static struct rq *move_queued_task(struct rq *rq, struct rq_flags *rf,
struct task_struct *p, int new_cpu)
{
- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

deactivate_task(rq, p, DEQUEUE_NOCLOCK);
set_task_cpu(p, new_cpu);
@@ -1845,7 +1845,7 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
* Because __kthread_bind() calls this on blocked tasks without
* holding rq->lock.
*/
- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));
dequeue_task(rq, p, DEQUEUE_SAVE | DEQUEUE_NOCLOCK);
}
if (running)
@@ -1982,7 +1982,7 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
* task_rq_lock().
*/
WARN_ON_ONCE(debug_locks && !(lockdep_is_held(&p->pi_lock) ||
- lockdep_is_held(&task_rq(p)->lock)));
+ lockdep_is_held(rq_lockp(task_rq(p)))));
#endif
/*
* Clearly, migrating tasks to offline CPUs is a fairly daft thing.
@@ -2493,7 +2493,7 @@ ttwu_do_activate(struct rq *rq, struct task_struct *p, int wake_flags,
{
int en_flags = ENQUEUE_WAKEUP | ENQUEUE_NOCLOCK;

- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

if (p->sched_contributes_to_load)
rq->nr_uninterruptible--;
@@ -3495,10 +3495,10 @@ prepare_lock_switch(struct rq *rq, struct task_struct *next, struct rq_flags *rf
* do an early lockdep release here:
*/
rq_unpin_lock(rq, rf);
- spin_release(&rq->lock.dep_map, _THIS_IP_);
+ spin_release(&rq_lockp(rq)->dep_map, _THIS_IP_);
#ifdef CONFIG_DEBUG_SPINLOCK
/* this is a valid case when another task releases the spinlock */
- rq->lock.owner = next;
+ rq_lockp(rq)->owner = next;
#endif
}

@@ -3509,8 +3509,8 @@ static inline void finish_lock_switch(struct rq *rq)
* fix up the runqueue lock - which gets 'carried over' from
* prev into current:
*/
- spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_);
- raw_spin_unlock_irq(&rq->lock);
+ spin_acquire(&rq_lockp(rq)->dep_map, 0, 0, _THIS_IP_);
+ raw_spin_unlock_irq(rq_lockp(rq));
}

/*
@@ -3660,7 +3660,7 @@ static void __balance_callback(struct rq *rq)
void (*func)(struct rq *rq);
unsigned long flags;

- raw_spin_lock_irqsave(&rq->lock, flags);
+ raw_spin_lock_irqsave(rq_lockp(rq), flags);
head = rq->balance_callback;
rq->balance_callback = NULL;
while (head) {
@@ -3671,7 +3671,7 @@ static void __balance_callback(struct rq *rq)

func(rq);
}
- raw_spin_unlock_irqrestore(&rq->lock, flags);
+ raw_spin_unlock_irqrestore(rq_lockp(rq), flags);
}

static inline void balance_callback(struct rq *rq)
@@ -6521,7 +6521,7 @@ void init_idle(struct task_struct *idle, int cpu)
__sched_fork(0, idle);

raw_spin_lock_irqsave(&idle->pi_lock, flags);
- raw_spin_lock(&rq->lock);
+ raw_spin_lock(rq_lockp(rq));

idle->state = TASK_RUNNING;
idle->se.exec_start = sched_clock();
@@ -6559,7 +6559,7 @@ void init_idle(struct task_struct *idle, int cpu)
#ifdef CONFIG_SMP
idle->on_cpu = 1;
#endif
- raw_spin_unlock(&rq->lock);
+ raw_spin_unlock(rq_lockp(rq));
raw_spin_unlock_irqrestore(&idle->pi_lock, flags);

/* Set the preempt count _outside_ the spinlocks! */
@@ -7131,7 +7131,7 @@ void __init sched_init(void)
struct rq *rq;

rq = cpu_rq(i);
- raw_spin_lock_init(&rq->lock);
+ raw_spin_lock_init(&rq->__lock);
rq->nr_running = 0;
rq->calc_load_active = 0;
rq->calc_load_update = jiffies + LOAD_FREQ;
diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index 941c28cf9738..38c1a68e91f0 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -112,7 +112,7 @@ static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu,
/*
* Take rq->lock to make 64-bit read safe on 32-bit platforms.
*/
- raw_spin_lock_irq(&cpu_rq(cpu)->lock);
+ raw_spin_lock_irq(rq_lockp(cpu_rq(cpu)));
#endif

if (index == CPUACCT_STAT_NSTATS) {
@@ -126,7 +126,7 @@ static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu,
}

#ifndef CONFIG_64BIT
- raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
+ raw_spin_unlock_irq(rq_lockp(cpu_rq(cpu)));
#endif

return data;
@@ -141,14 +141,14 @@ static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
/*
* Take rq->lock to make 64-bit write safe on 32-bit platforms.
*/
- raw_spin_lock_irq(&cpu_rq(cpu)->lock);
+ raw_spin_lock_irq(rq_lockp(cpu_rq(cpu)));
#endif

for (i = 0; i < CPUACCT_STAT_NSTATS; i++)
cpuusage->usages[i] = val;

#ifndef CONFIG_64BIT
- raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
+ raw_spin_unlock_irq(rq_lockp(cpu_rq(cpu)));
#endif
}

@@ -253,13 +253,13 @@ static int cpuacct_all_seq_show(struct seq_file *m, void *V)
* Take rq->lock to make 64-bit read safe on 32-bit
* platforms.
*/
- raw_spin_lock_irq(&cpu_rq(cpu)->lock);
+ raw_spin_lock_irq(rq_lockp(cpu_rq(cpu)));
#endif

seq_printf(m, " %llu", cpuusage->usages[index]);

#ifndef CONFIG_64BIT
- raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
+ raw_spin_unlock_irq(rq_lockp(cpu_rq(cpu)));
#endif
}
seq_puts(m, "\n");
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 6d93f4518734..814ec49502b1 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -119,7 +119,7 @@ void __add_running_bw(u64 dl_bw, struct dl_rq *dl_rq)
{
u64 old = dl_rq->running_bw;

- lockdep_assert_held(&(rq_of_dl_rq(dl_rq))->lock);
+ lockdep_assert_held(rq_lockp(rq_of_dl_rq(dl_rq)));
dl_rq->running_bw += dl_bw;
SCHED_WARN_ON(dl_rq->running_bw < old); /* overflow */
SCHED_WARN_ON(dl_rq->running_bw > dl_rq->this_bw);
@@ -132,7 +132,7 @@ void __sub_running_bw(u64 dl_bw, struct dl_rq *dl_rq)
{
u64 old = dl_rq->running_bw;

- lockdep_assert_held(&(rq_of_dl_rq(dl_rq))->lock);
+ lockdep_assert_held(rq_lockp(rq_of_dl_rq(dl_rq)));
dl_rq->running_bw -= dl_bw;
SCHED_WARN_ON(dl_rq->running_bw > old); /* underflow */
if (dl_rq->running_bw > old)
@@ -146,7 +146,7 @@ void __add_rq_bw(u64 dl_bw, struct dl_rq *dl_rq)
{
u64 old = dl_rq->this_bw;

- lockdep_assert_held(&(rq_of_dl_rq(dl_rq))->lock);
+ lockdep_assert_held(rq_lockp(rq_of_dl_rq(dl_rq)));
dl_rq->this_bw += dl_bw;
SCHED_WARN_ON(dl_rq->this_bw < old); /* overflow */
}
@@ -156,7 +156,7 @@ void __sub_rq_bw(u64 dl_bw, struct dl_rq *dl_rq)
{
u64 old = dl_rq->this_bw;

- lockdep_assert_held(&(rq_of_dl_rq(dl_rq))->lock);
+ lockdep_assert_held(rq_lockp(rq_of_dl_rq(dl_rq)));
dl_rq->this_bw -= dl_bw;
SCHED_WARN_ON(dl_rq->this_bw > old); /* underflow */
if (dl_rq->this_bw > old)
@@ -966,7 +966,7 @@ static int start_dl_timer(struct task_struct *p)
ktime_t now, act;
s64 delta;

- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

/*
* We want the timer to fire at the deadline, but considering
@@ -1076,9 +1076,9 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer *timer)
* If the runqueue is no longer available, migrate the
* task elsewhere. This necessarily changes rq.
*/
- lockdep_unpin_lock(&rq->lock, rf.cookie);
+ lockdep_unpin_lock(rq_lockp(rq), rf.cookie);
rq = dl_task_offline_migration(rq, p);
- rf.cookie = lockdep_pin_lock(&rq->lock);
+ rf.cookie = lockdep_pin_lock(rq_lockp(rq));
update_rq_clock(rq);

/*
@@ -1727,7 +1727,7 @@ static void migrate_task_rq_dl(struct task_struct *p, int new_cpu __maybe_unused
* from try_to_wake_up(). Hence, p->pi_lock is locked, but
* rq->lock is not... So, lock it
*/
- raw_spin_lock(&rq->lock);
+ raw_spin_lock(rq_lockp(rq));
if (p->dl.dl_non_contending) {
sub_running_bw(&p->dl, &rq->dl);
p->dl.dl_non_contending = 0;
@@ -1742,7 +1742,7 @@ static void migrate_task_rq_dl(struct task_struct *p, int new_cpu __maybe_unused
put_task_struct(p);
}
sub_rq_bw(&p->dl, &rq->dl);
- raw_spin_unlock(&rq->lock);
+ raw_spin_unlock(rq_lockp(rq));
}

static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 0655524700d2..c8fee8d9dfd4 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -551,7 +551,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
SPLIT_NS(cfs_rq->exec_clock));

- raw_spin_lock_irqsave(&rq->lock, flags);
+ raw_spin_lock_irqsave(rq_lockp(rq), flags);
if (rb_first_cached(&cfs_rq->tasks_timeline))
MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
last = __pick_last_entity(cfs_rq);
@@ -559,7 +559,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
max_vruntime = last->vruntime;
min_vruntime = cfs_rq->min_vruntime;
rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
- raw_spin_unlock_irqrestore(&rq->lock, flags);
+ raw_spin_unlock_irqrestore(rq_lockp(rq), flags);
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
SPLIT_NS(MIN_vruntime));
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index aa4c6227cd6d..dbd9368a959d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1101,7 +1101,7 @@ struct numa_group {
static struct numa_group *deref_task_numa_group(struct task_struct *p)
{
return rcu_dereference_check(p->numa_group, p == current ||
- (lockdep_is_held(&task_rq(p)->lock) && !READ_ONCE(p->on_cpu)));
+ (lockdep_is_held(rq_lockp(task_rq(p))) && !READ_ONCE(p->on_cpu)));
}

static struct numa_group *deref_curr_numa_group(struct task_struct *p)
@@ -5291,7 +5291,7 @@ static void __maybe_unused update_runtime_enabled(struct rq *rq)
{
struct task_group *tg;

- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

rcu_read_lock();
list_for_each_entry_rcu(tg, &task_groups, list) {
@@ -5310,7 +5310,7 @@ static void __maybe_unused unthrottle_offline_cfs_rqs(struct rq *rq)
{
struct task_group *tg;

- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

rcu_read_lock();
list_for_each_entry_rcu(tg, &task_groups, list) {
@@ -6772,7 +6772,7 @@ static void migrate_task_rq_fair(struct task_struct *p, int new_cpu)
* In case of TASK_ON_RQ_MIGRATING we in fact hold the 'old'
* rq->lock and can modify state directly.
*/
- lockdep_assert_held(&task_rq(p)->lock);
+ lockdep_assert_held(rq_lockp(task_rq(p)));
detach_entity_cfs_rq(&p->se);

} else {
@@ -7400,7 +7400,7 @@ static int task_hot(struct task_struct *p, struct lb_env *env)
{
s64 delta;

- lockdep_assert_held(&env->src_rq->lock);
+ lockdep_assert_held(rq_lockp(env->src_rq));

if (p->sched_class != &fair_sched_class)
return 0;
@@ -7498,7 +7498,7 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env)
{
int tsk_cache_hot;

- lockdep_assert_held(&env->src_rq->lock);
+ lockdep_assert_held(rq_lockp(env->src_rq));

/*
* We do not migrate tasks that are:
@@ -7576,7 +7576,7 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env)
*/
static void detach_task(struct task_struct *p, struct lb_env *env)
{
- lockdep_assert_held(&env->src_rq->lock);
+ lockdep_assert_held(rq_lockp(env->src_rq));

deactivate_task(env->src_rq, p, DEQUEUE_NOCLOCK);
set_task_cpu(p, env->dst_cpu);
@@ -7592,7 +7592,7 @@ static struct task_struct *detach_one_task(struct lb_env *env)
{
struct task_struct *p;

- lockdep_assert_held(&env->src_rq->lock);
+ lockdep_assert_held(rq_lockp(env->src_rq));

list_for_each_entry_reverse(p,
&env->src_rq->cfs_tasks, se.group_node) {
@@ -7628,7 +7628,7 @@ static int detach_tasks(struct lb_env *env)
struct task_struct *p;
int detached = 0;

- lockdep_assert_held(&env->src_rq->lock);
+ lockdep_assert_held(rq_lockp(env->src_rq));

if (env->imbalance <= 0)
return 0;
@@ -7750,7 +7750,7 @@ static int detach_tasks(struct lb_env *env)
*/
static void attach_task(struct rq *rq, struct task_struct *p)
{
- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

BUG_ON(task_rq(p) != rq);
activate_task(rq, p, ENQUEUE_NOCLOCK);
@@ -9684,7 +9684,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
if (need_active_balance(&env)) {
unsigned long flags;

- raw_spin_lock_irqsave(&busiest->lock, flags);
+ raw_spin_lock_irqsave(rq_lockp(busiest), flags);

/*
* Don't kick the active_load_balance_cpu_stop,
@@ -9692,7 +9692,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
* moved to this_cpu:
*/
if (!cpumask_test_cpu(this_cpu, busiest->curr->cpus_ptr)) {
- raw_spin_unlock_irqrestore(&busiest->lock,
+ raw_spin_unlock_irqrestore(rq_lockp(busiest),
flags);
env.flags |= LBF_ALL_PINNED;
goto out_one_pinned;
@@ -9708,7 +9708,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
busiest->push_cpu = this_cpu;
active_balance = 1;
}
- raw_spin_unlock_irqrestore(&busiest->lock, flags);
+ raw_spin_unlock_irqrestore(rq_lockp(busiest), flags);

if (active_balance) {
stop_one_cpu_nowait(cpu_of(busiest),
@@ -10460,7 +10460,7 @@ static void nohz_newidle_balance(struct rq *this_rq)
time_before(jiffies, READ_ONCE(nohz.next_blocked)))
return;

- raw_spin_unlock(&this_rq->lock);
+ raw_spin_unlock(rq_lockp(this_rq));
/*
* This CPU is going to be idle and blocked load of idle CPUs
* need to be updated. Run the ilb locally as it is a good
@@ -10469,7 +10469,7 @@ static void nohz_newidle_balance(struct rq *this_rq)
*/
if (!_nohz_idle_balance(this_rq, NOHZ_STATS_KICK, CPU_NEWLY_IDLE))
kick_ilb(NOHZ_STATS_KICK);
- raw_spin_lock(&this_rq->lock);
+ raw_spin_lock(rq_lockp(this_rq));
}

#else /* !CONFIG_NO_HZ_COMMON */
@@ -10535,7 +10535,7 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
goto out;
}

- raw_spin_unlock(&this_rq->lock);
+ raw_spin_unlock(rq_lockp(this_rq));

update_blocked_averages(this_cpu);
rcu_read_lock();
@@ -10573,7 +10573,7 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
}
rcu_read_unlock();

- raw_spin_lock(&this_rq->lock);
+ raw_spin_lock(rq_lockp(this_rq));

if (curr_cost > this_rq->max_idle_balance_cost)
this_rq->max_idle_balance_cost = curr_cost;
@@ -11049,9 +11049,9 @@ void unregister_fair_sched_group(struct task_group *tg)

rq = cpu_rq(cpu);

- raw_spin_lock_irqsave(&rq->lock, flags);
+ raw_spin_lock_irqsave(rq_lockp(rq), flags);
list_del_leaf_cfs_rq(tg->cfs_rq[cpu]);
- raw_spin_unlock_irqrestore(&rq->lock, flags);
+ raw_spin_unlock_irqrestore(rq_lockp(rq), flags);
}
}

diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index f324dc36fc43..8ce6e80352cf 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -421,10 +421,10 @@ struct task_struct *pick_next_task_idle(struct rq *rq)
static void
dequeue_task_idle(struct rq *rq, struct task_struct *p, int flags)
{
- raw_spin_unlock_irq(&rq->lock);
+ raw_spin_unlock_irq(rq_lockp(rq));
printk(KERN_ERR "bad: scheduling from the idle thread!\n");
dump_stack();
- raw_spin_lock_irq(&rq->lock);
+ raw_spin_lock_irq(rq_lockp(rq));
}

/*
diff --git a/kernel/sched/pelt.h b/kernel/sched/pelt.h
index 795e43e02afc..e850bd71a8ce 100644
--- a/kernel/sched/pelt.h
+++ b/kernel/sched/pelt.h
@@ -141,7 +141,7 @@ static inline void update_idle_rq_clock_pelt(struct rq *rq)

static inline u64 rq_clock_pelt(struct rq *rq)
{
- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));
assert_clock_updated(rq);

return rq->clock_pelt - rq->lost_idle_time;
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index f215eea6a966..e57fca05b660 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -887,7 +887,7 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
if (skip)
continue;

- raw_spin_lock(&rq->lock);
+ raw_spin_lock(rq_lockp(rq));
update_rq_clock(rq);

if (rt_rq->rt_time) {
@@ -925,7 +925,7 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)

if (enqueue)
sched_rt_rq_enqueue(rt_rq);
- raw_spin_unlock(&rq->lock);
+ raw_spin_unlock(rq_lockp(rq));
}

if (!throttled && (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF))
@@ -2094,9 +2094,9 @@ void rto_push_irq_work_func(struct irq_work *work)
* When it gets updated, a check is made if a push is possible.
*/
if (has_pushable_tasks(rq)) {
- raw_spin_lock(&rq->lock);
+ raw_spin_lock(rq_lockp(rq));
push_rt_tasks(rq);
- raw_spin_unlock(&rq->lock);
+ raw_spin_unlock(rq_lockp(rq));
}

raw_spin_lock(&rd->rto_lock);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index df80bfcea92e..587ebabebaff 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -894,7 +894,7 @@ DECLARE_STATIC_KEY_FALSE(sched_uclamp_used);
*/
struct rq {
/* runqueue lock: */
- raw_spinlock_t lock;
+ raw_spinlock_t __lock;

/*
* nr_running and cpu_load should be in the same cacheline because
@@ -1075,6 +1075,10 @@ static inline int cpu_of(struct rq *rq)
#endif
}

+static inline raw_spinlock_t *rq_lockp(struct rq *rq)
+{
+ return &rq->__lock;
+}

#ifdef CONFIG_SCHED_SMT
extern void __update_idle_core(struct rq *rq);
@@ -1142,7 +1146,7 @@ static inline void assert_clock_updated(struct rq *rq)

static inline u64 rq_clock(struct rq *rq)
{
- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));
assert_clock_updated(rq);

return rq->clock;
@@ -1150,7 +1154,7 @@ static inline u64 rq_clock(struct rq *rq)

static inline u64 rq_clock_task(struct rq *rq)
{
- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));
assert_clock_updated(rq);

return rq->clock_task;
@@ -1176,7 +1180,7 @@ static inline u64 rq_clock_thermal(struct rq *rq)

static inline void rq_clock_skip_update(struct rq *rq)
{
- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));
rq->clock_update_flags |= RQCF_REQ_SKIP;
}

@@ -1186,7 +1190,7 @@ static inline void rq_clock_skip_update(struct rq *rq)
*/
static inline void rq_clock_cancel_skipupdate(struct rq *rq)
{
- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));
rq->clock_update_flags &= ~RQCF_REQ_SKIP;
}

@@ -1215,7 +1219,7 @@ struct rq_flags {
*/
static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf)
{
- rf->cookie = lockdep_pin_lock(&rq->lock);
+ rf->cookie = lockdep_pin_lock(rq_lockp(rq));

#ifdef CONFIG_SCHED_DEBUG
rq->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP);
@@ -1230,12 +1234,12 @@ static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf)
rf->clock_update_flags = RQCF_UPDATED;
#endif

- lockdep_unpin_lock(&rq->lock, rf->cookie);
+ lockdep_unpin_lock(rq_lockp(rq), rf->cookie);
}

static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf)
{
- lockdep_repin_lock(&rq->lock, rf->cookie);
+ lockdep_repin_lock(rq_lockp(rq), rf->cookie);

#ifdef CONFIG_SCHED_DEBUG
/*
@@ -1256,7 +1260,7 @@ static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
- raw_spin_unlock(&rq->lock);
+ raw_spin_unlock(rq_lockp(rq));
}

static inline void
@@ -1265,7 +1269,7 @@ task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
__releases(p->pi_lock)
{
rq_unpin_lock(rq, rf);
- raw_spin_unlock(&rq->lock);
+ raw_spin_unlock(rq_lockp(rq));
raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
}

@@ -1273,7 +1277,7 @@ static inline void
rq_lock_irqsave(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
- raw_spin_lock_irqsave(&rq->lock, rf->flags);
+ raw_spin_lock_irqsave(rq_lockp(rq), rf->flags);
rq_pin_lock(rq, rf);
}

@@ -1281,7 +1285,7 @@ static inline void
rq_lock_irq(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
- raw_spin_lock_irq(&rq->lock);
+ raw_spin_lock_irq(rq_lockp(rq));
rq_pin_lock(rq, rf);
}

@@ -1289,7 +1293,7 @@ static inline void
rq_lock(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
- raw_spin_lock(&rq->lock);
+ raw_spin_lock(rq_lockp(rq));
rq_pin_lock(rq, rf);
}

@@ -1297,7 +1301,7 @@ static inline void
rq_relock(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
- raw_spin_lock(&rq->lock);
+ raw_spin_lock(rq_lockp(rq));
rq_repin_lock(rq, rf);
}

@@ -1306,7 +1310,7 @@ rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
- raw_spin_unlock_irqrestore(&rq->lock, rf->flags);
+ raw_spin_unlock_irqrestore(rq_lockp(rq), rf->flags);
}

static inline void
@@ -1314,7 +1318,7 @@ rq_unlock_irq(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
- raw_spin_unlock_irq(&rq->lock);
+ raw_spin_unlock_irq(rq_lockp(rq));
}

static inline void
@@ -1322,7 +1326,7 @@ rq_unlock(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
- raw_spin_unlock(&rq->lock);
+ raw_spin_unlock(rq_lockp(rq));
}

static inline struct rq *
@@ -1387,7 +1391,7 @@ queue_balance_callback(struct rq *rq,
struct callback_head *head,
void (*func)(struct rq *rq))
{
- lockdep_assert_held(&rq->lock);
+ lockdep_assert_held(rq_lockp(rq));

if (unlikely(head->next))
return;
@@ -2091,7 +2095,7 @@ static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
__acquires(busiest->lock)
__acquires(this_rq->lock)
{
- raw_spin_unlock(&this_rq->lock);
+ raw_spin_unlock(rq_lockp(this_rq));
double_rq_lock(this_rq, busiest);

return 1;
@@ -2110,20 +2114,22 @@ static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
__acquires(busiest->lock)
__acquires(this_rq->lock)
{
- int ret = 0;
-
- if (unlikely(!raw_spin_trylock(&busiest->lock))) {
- if (busiest < this_rq) {
- raw_spin_unlock(&this_rq->lock);
- raw_spin_lock(&busiest->lock);
- raw_spin_lock_nested(&this_rq->lock,
- SINGLE_DEPTH_NESTING);
- ret = 1;
- } else
- raw_spin_lock_nested(&busiest->lock,
- SINGLE_DEPTH_NESTING);
+ if (rq_lockp(this_rq) == rq_lockp(busiest))
+ return 0;
+
+ if (likely(raw_spin_trylock(rq_lockp(busiest))))
+ return 0;
+
+ if (rq_lockp(busiest) >= rq_lockp(this_rq)) {
+ raw_spin_lock_nested(rq_lockp(busiest), SINGLE_DEPTH_NESTING);
+ return 0;
}
- return ret;
+
+ raw_spin_unlock(rq_lockp(this_rq));
+ raw_spin_lock(rq_lockp(busiest));
+ raw_spin_lock_nested(rq_lockp(this_rq), SINGLE_DEPTH_NESTING);
+
+ return 1;
}

#endif /* CONFIG_PREEMPTION */
@@ -2133,11 +2139,7 @@ static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
*/
static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest)
{
- if (unlikely(!irqs_disabled())) {
- /* printk() doesn't work well under rq->lock */
- raw_spin_unlock(&this_rq->lock);
- BUG_ON(1);
- }
+ lockdep_assert_irqs_disabled();

return _double_lock_balance(this_rq, busiest);
}
@@ -2145,8 +2147,9 @@ static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest)
static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
__releases(busiest->lock)
{
- raw_spin_unlock(&busiest->lock);
- lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
+ if (rq_lockp(this_rq) != rq_lockp(busiest))
+ raw_spin_unlock(rq_lockp(busiest));
+ lock_set_subclass(&rq_lockp(this_rq)->dep_map, 0, _RET_IP_);
}

static inline void double_lock(spinlock_t *l1, spinlock_t *l2)
@@ -2187,16 +2190,16 @@ static inline void double_rq_lock(struct rq *rq1, struct rq *rq2)
__acquires(rq2->lock)
{
BUG_ON(!irqs_disabled());
- if (rq1 == rq2) {
- raw_spin_lock(&rq1->lock);
+ if (rq_lockp(rq1) == rq_lockp(rq2)) {
+ raw_spin_lock(rq_lockp(rq1));
__acquire(rq2->lock); /* Fake it out ;) */
} else {
- if (rq1 < rq2) {
- raw_spin_lock(&rq1->lock);
- raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING);
+ if (rq_lockp(rq1) < rq_lockp(rq2)) {
+ raw_spin_lock(rq_lockp(rq1));
+ raw_spin_lock_nested(rq_lockp(rq2), SINGLE_DEPTH_NESTING);
} else {
- raw_spin_lock(&rq2->lock);
- raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
+ raw_spin_lock(rq_lockp(rq2));
+ raw_spin_lock_nested(rq_lockp(rq1), SINGLE_DEPTH_NESTING);
}
}
}
@@ -2211,9 +2214,9 @@ static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
__releases(rq1->lock)
__releases(rq2->lock)
{
- raw_spin_unlock(&rq1->lock);
- if (rq1 != rq2)
- raw_spin_unlock(&rq2->lock);
+ raw_spin_unlock(rq_lockp(rq1));
+ if (rq_lockp(rq1) != rq_lockp(rq2))
+ raw_spin_unlock(rq_lockp(rq2));
else
__release(rq2->lock);
}
@@ -2236,7 +2239,7 @@ static inline void double_rq_lock(struct rq *rq1, struct rq *rq2)
{
BUG_ON(!irqs_disabled());
BUG_ON(rq1 != rq2);
- raw_spin_lock(&rq1->lock);
+ raw_spin_lock(rq_lockp(rq1));
__acquire(rq2->lock); /* Fake it out ;) */
}

@@ -2251,7 +2254,7 @@ static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
__releases(rq2->lock)
{
BUG_ON(rq1 != rq2);
- raw_spin_unlock(&rq1->lock);
+ raw_spin_unlock(rq_lockp(rq1));
__release(rq2->lock);
}

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index dd7770226086..eeb9aca1c853 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -454,7 +454,7 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd)
struct root_domain *old_rd = NULL;
unsigned long flags;

- raw_spin_lock_irqsave(&rq->lock, flags);
+ raw_spin_lock_irqsave(rq_lockp(rq), flags);

if (rq->rd) {
old_rd = rq->rd;
@@ -480,7 +480,7 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd)
if (cpumask_test_cpu(rq->cpu, cpu_active_mask))
set_rq_online(rq);

- raw_spin_unlock_irqrestore(&rq->lock, flags);
+ raw_spin_unlock_irqrestore(rq_lockp(rq), flags);

if (old_rd)
call_rcu(&old_rd->rcu, free_rootdomain);
--
2.29.0.rc1.297.gfa9743e501-goog