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-rw-r--r--kernel/cgroup/cgroup-v1.c2
-rw-r--r--kernel/debug/kdb/kdb_support.c18
-rw-r--r--kernel/fork.c4
-rw-r--r--kernel/hung_task.c2
-rw-r--r--kernel/kthread.c4
-rw-r--r--kernel/locking/mutex.c6
-rw-r--r--kernel/locking/rtmutex.c4
-rw-r--r--kernel/locking/rwsem.c2
-rw-r--r--kernel/ptrace.c12
-rw-r--r--kernel/rcu/rcutorture.c4
-rw-r--r--kernel/rcu/tree_stall.h12
-rw-r--r--kernel/sched/core.c53
-rw-r--r--kernel/sched/deadline.c10
-rw-r--r--kernel/sched/fair.c11
14 files changed, 76 insertions, 68 deletions
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 1f274d7fc934..ee93b6e89587 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -713,7 +713,7 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
css_task_iter_start(&cgrp->self, 0, &it);
while ((tsk = css_task_iter_next(&it))) {
- switch (tsk->state) {
+ switch (READ_ONCE(tsk->__state)) {
case TASK_RUNNING:
stats->nr_running++;
break;
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 91bb666d7c03..9f50d22d68e6 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -609,23 +609,25 @@ unsigned long kdb_task_state_string(const char *s)
*/
char kdb_task_state_char (const struct task_struct *p)
{
- int cpu;
- char state;
+ unsigned int p_state;
unsigned long tmp;
+ char state;
+ int cpu;
if (!p ||
copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
return 'E';
cpu = kdb_process_cpu(p);
- state = (p->state == 0) ? 'R' :
- (p->state < 0) ? 'U' :
- (p->state & TASK_UNINTERRUPTIBLE) ? 'D' :
- (p->state & TASK_STOPPED) ? 'T' :
- (p->state & TASK_TRACED) ? 'C' :
+ p_state = READ_ONCE(p->__state);
+ state = (p_state == 0) ? 'R' :
+ (p_state < 0) ? 'U' :
+ (p_state & TASK_UNINTERRUPTIBLE) ? 'D' :
+ (p_state & TASK_STOPPED) ? 'T' :
+ (p_state & TASK_TRACED) ? 'C' :
(p->exit_state & EXIT_ZOMBIE) ? 'Z' :
(p->exit_state & EXIT_DEAD) ? 'E' :
- (p->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
+ (p_state & TASK_INTERRUPTIBLE) ? 'S' : '?';
if (is_idle_task(p)) {
/* Idle task. Is it really idle, apart from the kdb
* interrupt? */
diff --git a/kernel/fork.c b/kernel/fork.c
index e595e77913eb..1a9af73b47c1 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -425,7 +425,7 @@ static int memcg_charge_kernel_stack(struct task_struct *tsk)
static void release_task_stack(struct task_struct *tsk)
{
- if (WARN_ON(tsk->state != TASK_DEAD))
+ if (WARN_ON(READ_ONCE(tsk->__state) != TASK_DEAD))
return; /* Better to leak the stack than to free prematurely */
account_kernel_stack(tsk, -1);
@@ -2392,7 +2392,7 @@ bad_fork_cleanup_count:
atomic_dec(&p->cred->user->processes);
exit_creds(p);
bad_fork_free:
- p->state = TASK_DEAD;
+ WRITE_ONCE(p->__state, TASK_DEAD);
put_task_stack(p);
delayed_free_task(p);
fork_out:
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 396ebaebea3f..b0ce8b3f3822 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -196,7 +196,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
last_break = jiffies;
}
/* use "==" to skip the TASK_KILLABLE tasks waiting on NFS */
- if (t->state == TASK_UNINTERRUPTIBLE)
+ if (READ_ONCE(t->__state) == TASK_UNINTERRUPTIBLE)
check_hung_task(t, timeout);
}
unlock:
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 3d326833092b..7bbfeeb0e956 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -457,7 +457,7 @@ struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
}
EXPORT_SYMBOL(kthread_create_on_node);
-static void __kthread_bind_mask(struct task_struct *p, const struct cpumask *mask, long state)
+static void __kthread_bind_mask(struct task_struct *p, const struct cpumask *mask, unsigned int state)
{
unsigned long flags;
@@ -473,7 +473,7 @@ static void __kthread_bind_mask(struct task_struct *p, const struct cpumask *mas
raw_spin_unlock_irqrestore(&p->pi_lock, flags);
}
-static void __kthread_bind(struct task_struct *p, unsigned int cpu, long state)
+static void __kthread_bind(struct task_struct *p, unsigned int cpu, unsigned int state)
{
__kthread_bind_mask(p, cpumask_of(cpu), state);
}
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index 013e1b08a1bf..d2df5e68b503 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -923,7 +923,7 @@ __ww_mutex_add_waiter(struct mutex_waiter *waiter,
* Lock a mutex (possibly interruptible), slowpath:
*/
static __always_inline int __sched
-__mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
+__mutex_lock_common(struct mutex *lock, unsigned int state, unsigned int subclass,
struct lockdep_map *nest_lock, unsigned long ip,
struct ww_acquire_ctx *ww_ctx, const bool use_ww_ctx)
{
@@ -1098,14 +1098,14 @@ err_early_kill:
}
static int __sched
-__mutex_lock(struct mutex *lock, long state, unsigned int subclass,
+__mutex_lock(struct mutex *lock, unsigned int state, unsigned int subclass,
struct lockdep_map *nest_lock, unsigned long ip)
{
return __mutex_lock_common(lock, state, subclass, nest_lock, ip, NULL, false);
}
static int __sched
-__ww_mutex_lock(struct mutex *lock, long state, unsigned int subclass,
+__ww_mutex_lock(struct mutex *lock, unsigned int state, unsigned int subclass,
struct lockdep_map *nest_lock, unsigned long ip,
struct ww_acquire_ctx *ww_ctx)
{
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index 406818196a9f..b5d9bb5202c6 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1135,7 +1135,7 @@ void __sched rt_mutex_init_waiter(struct rt_mutex_waiter *waiter)
*
* Must be called with lock->wait_lock held and interrupts disabled
*/
-static int __sched __rt_mutex_slowlock(struct rt_mutex *lock, int state,
+static int __sched __rt_mutex_slowlock(struct rt_mutex *lock, unsigned int state,
struct hrtimer_sleeper *timeout,
struct rt_mutex_waiter *waiter)
{
@@ -1190,7 +1190,7 @@ static void __sched rt_mutex_handle_deadlock(int res, int detect_deadlock,
/*
* Slow path lock function:
*/
-static int __sched rt_mutex_slowlock(struct rt_mutex *lock, int state,
+static int __sched rt_mutex_slowlock(struct rt_mutex *lock, unsigned int state,
struct hrtimer_sleeper *timeout,
enum rtmutex_chainwalk chwalk)
{
diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c
index 809b0016d344..16bfbb10c74d 100644
--- a/kernel/locking/rwsem.c
+++ b/kernel/locking/rwsem.c
@@ -889,7 +889,7 @@ rwsem_spin_on_owner(struct rw_semaphore *sem)
* Wait for the read lock to be granted
*/
static struct rw_semaphore __sched *
-rwsem_down_read_slowpath(struct rw_semaphore *sem, long count, int state)
+rwsem_down_read_slowpath(struct rw_semaphore *sem, long count, unsigned int state)
{
long adjustment = -RWSEM_READER_BIAS;
long rcnt = (count >> RWSEM_READER_SHIFT);
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 2997ca600d18..f8589bf8d7dc 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -197,7 +197,7 @@ static bool ptrace_freeze_traced(struct task_struct *task)
spin_lock_irq(&task->sighand->siglock);
if (task_is_traced(task) && !looks_like_a_spurious_pid(task) &&
!__fatal_signal_pending(task)) {
- task->state = __TASK_TRACED;
+ WRITE_ONCE(task->__state, __TASK_TRACED);
ret = true;
}
spin_unlock_irq(&task->sighand->siglock);
@@ -207,7 +207,7 @@ static bool ptrace_freeze_traced(struct task_struct *task)
static void ptrace_unfreeze_traced(struct task_struct *task)
{
- if (task->state != __TASK_TRACED)
+ if (READ_ONCE(task->__state) != __TASK_TRACED)
return;
WARN_ON(!task->ptrace || task->parent != current);
@@ -217,11 +217,11 @@ static void ptrace_unfreeze_traced(struct task_struct *task)
* Recheck state under the lock to close this race.
*/
spin_lock_irq(&task->sighand->siglock);
- if (task->state == __TASK_TRACED) {
+ if (READ_ONCE(task->__state) == __TASK_TRACED) {
if (__fatal_signal_pending(task))
wake_up_state(task, __TASK_TRACED);
else
- task->state = TASK_TRACED;
+ WRITE_ONCE(task->__state, TASK_TRACED);
}
spin_unlock_irq(&task->sighand->siglock);
}
@@ -256,7 +256,7 @@ static int ptrace_check_attach(struct task_struct *child, bool ignore_state)
*/
read_lock(&tasklist_lock);
if (child->ptrace && child->parent == current) {
- WARN_ON(child->state == __TASK_TRACED);
+ WARN_ON(READ_ONCE(child->__state) == __TASK_TRACED);
/*
* child->sighand can't be NULL, release_task()
* does ptrace_unlink() before __exit_signal().
@@ -273,7 +273,7 @@ static int ptrace_check_attach(struct task_struct *child, bool ignore_state)
* ptrace_stop() changes ->state back to TASK_RUNNING,
* so we should not worry about leaking __TASK_TRACED.
*/
- WARN_ON(child->state == __TASK_TRACED);
+ WARN_ON(READ_ONCE(child->__state) == __TASK_TRACED);
ret = -ESRCH;
}
}
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 29d2f4c647d3..194b9c145c40 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1831,10 +1831,10 @@ rcu_torture_stats_print(void)
srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp,
&flags, &gp_seq);
wtp = READ_ONCE(writer_task);
- pr_alert("??? Writer stall state %s(%d) g%lu f%#x ->state %#lx cpu %d\n",
+ pr_alert("??? Writer stall state %s(%d) g%lu f%#x ->state %#x cpu %d\n",
rcu_torture_writer_state_getname(),
rcu_torture_writer_state, gp_seq, flags,
- wtp == NULL ? ~0UL : wtp->state,
+ wtp == NULL ? ~0U : wtp->__state,
wtp == NULL ? -1 : (int)task_cpu(wtp));
if (!splatted && wtp) {
sched_show_task(wtp);
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index 59b95cc5cbdf..acb2288063b5 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -460,12 +460,12 @@ static void rcu_check_gp_kthread_starvation(void)
if (rcu_is_gp_kthread_starving(&j)) {
cpu = gpk ? task_cpu(gpk) : -1;
- pr_err("%s kthread starved for %ld jiffies! g%ld f%#x %s(%d) ->state=%#lx ->cpu=%d\n",
+ pr_err("%s kthread starved for %ld jiffies! g%ld f%#x %s(%d) ->state=%#x ->cpu=%d\n",
rcu_state.name, j,
(long)rcu_seq_current(&rcu_state.gp_seq),
data_race(rcu_state.gp_flags),
gp_state_getname(rcu_state.gp_state), rcu_state.gp_state,
- gpk ? gpk->state : ~0, cpu);
+ gpk ? gpk->__state : ~0, cpu);
if (gpk) {
pr_err("\tUnless %s kthread gets sufficient CPU time, OOM is now expected behavior.\n", rcu_state.name);
pr_err("RCU grace-period kthread stack dump:\n");
@@ -503,12 +503,12 @@ static void rcu_check_gp_kthread_expired_fqs_timer(void)
time_after(jiffies, jiffies_fqs + RCU_STALL_MIGHT_MIN) &&
gpk && !READ_ONCE(gpk->on_rq)) {
cpu = task_cpu(gpk);
- pr_err("%s kthread timer wakeup didn't happen for %ld jiffies! g%ld f%#x %s(%d) ->state=%#lx\n",
+ pr_err("%s kthread timer wakeup didn't happen for %ld jiffies! g%ld f%#x %s(%d) ->state=%#x\n",
rcu_state.name, (jiffies - jiffies_fqs),
(long)rcu_seq_current(&rcu_state.gp_seq),
data_race(rcu_state.gp_flags),
gp_state_getname(RCU_GP_WAIT_FQS), RCU_GP_WAIT_FQS,
- gpk->state);
+ gpk->__state);
pr_err("\tPossible timer handling issue on cpu=%d timer-softirq=%u\n",
cpu, kstat_softirqs_cpu(TIMER_SOFTIRQ, cpu));
}
@@ -735,9 +735,9 @@ void show_rcu_gp_kthreads(void)
ja = j - data_race(rcu_state.gp_activity);
jr = j - data_race(rcu_state.gp_req_activity);
jw = j - data_race(rcu_state.gp_wake_time);
- pr_info("%s: wait state: %s(%d) ->state: %#lx delta ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_flags %#x\n",
+ pr_info("%s: wait state: %s(%d) ->state: %#x delta ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_flags %#x\n",
rcu_state.name, gp_state_getname(rcu_state.gp_state),
- rcu_state.gp_state, t ? t->state : 0x1ffffL,
+ rcu_state.gp_state, t ? t->__state : 0x1ffff,
ja, jr, jw, (long)data_race(rcu_state.gp_wake_seq),
(long)data_race(rcu_state.gp_seq),
(long)data_race(rcu_get_root()->gp_seq_needed),
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 45ebb3cfe86c..309745a7ec51 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2638,7 +2638,7 @@ static int affine_move_task(struct rq *rq, struct task_struct *p, struct rq_flag
return -EINVAL;
}
- if (task_running(rq, p) || p->state == TASK_WAKING) {
+ if (task_running(rq, p) || READ_ONCE(p->__state) == TASK_WAKING) {
/*
* MIGRATE_ENABLE gets here because 'p == current', but for
* anything else we cannot do is_migration_disabled(), punt
@@ -2781,19 +2781,20 @@ EXPORT_SYMBOL_GPL(set_cpus_allowed_ptr);
void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
{
#ifdef CONFIG_SCHED_DEBUG
+ unsigned int state = READ_ONCE(p->__state);
+
/*
* We should never call set_task_cpu() on a blocked task,
* ttwu() will sort out the placement.
*/
- WARN_ON_ONCE(p->state != TASK_RUNNING && p->state != TASK_WAKING &&
- !p->on_rq);
+ WARN_ON_ONCE(state != TASK_RUNNING && state != TASK_WAKING && !p->on_rq);
/*
* Migrating fair class task must have p->on_rq = TASK_ON_RQ_MIGRATING,
* because schedstat_wait_{start,end} rebase migrating task's wait_start
* time relying on p->on_rq.
*/
- WARN_ON_ONCE(p->state == TASK_RUNNING &&
+ WARN_ON_ONCE(state == TASK_RUNNING &&
p->sched_class == &fair_sched_class &&
(p->on_rq && !task_on_rq_migrating(p)));
@@ -2965,7 +2966,7 @@ out:
* smp_call_function() if an IPI is sent by the same process we are
* waiting to become inactive.
*/
-unsigned long wait_task_inactive(struct task_struct *p, long match_state)
+unsigned long wait_task_inactive(struct task_struct *p, unsigned int match_state)
{
int running, queued;
struct rq_flags rf;
@@ -2993,7 +2994,7 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
* is actually now running somewhere else!
*/
while (task_running(rq, p)) {
- if (match_state && unlikely(p->state != match_state))
+ if (match_state && unlikely(READ_ONCE(p->__state) != match_state))
return 0;
cpu_relax();
}
@@ -3008,7 +3009,7 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
running = task_running(rq, p);
queued = task_on_rq_queued(p);
ncsw = 0;
- if (!match_state || p->state == match_state)
+ if (!match_state || READ_ONCE(p->__state) == match_state)
ncsw = p->nvcsw | LONG_MIN; /* sets MSB */
task_rq_unlock(rq, p, &rf);
@@ -3317,7 +3318,7 @@ static void ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags,
struct rq_flags *rf)
{
check_preempt_curr(rq, p, wake_flags);
- p->state = TASK_RUNNING;
+ WRITE_ONCE(p->__state, TASK_RUNNING);
trace_sched_wakeup(p);
#ifdef CONFIG_SMP
@@ -3709,12 +3710,12 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
* - we're serialized against set_special_state() by virtue of
* it disabling IRQs (this allows not taking ->pi_lock).
*/
- if (!(p->state & state))
+ if (!(READ_ONCE(p->__state) & state))
goto out;
success = 1;
trace_sched_waking(p);
- p->state = TASK_RUNNING;
+ WRITE_ONCE(p->__state, TASK_RUNNING);
trace_sched_wakeup(p);
goto out;
}
@@ -3727,7 +3728,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
*/
raw_spin_lock_irqsave(&p->pi_lock, flags);
smp_mb__after_spinlock();
- if (!(p->state & state))
+ if (!(READ_ONCE(p->__state) & state))
goto unlock;
trace_sched_waking(p);
@@ -3793,7 +3794,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
* TASK_WAKING such that we can unlock p->pi_lock before doing the
* enqueue, such as ttwu_queue_wakelist().
*/
- p->state = TASK_WAKING;
+ WRITE_ONCE(p->__state, TASK_WAKING);
/*
* If the owning (remote) CPU is still in the middle of schedule() with
@@ -3886,7 +3887,7 @@ bool try_invoke_on_locked_down_task(struct task_struct *p, bool (*func)(struct t
ret = func(p, arg);
rq_unlock(rq, &rf);
} else {
- switch (p->state) {
+ switch (READ_ONCE(p->__state)) {
case TASK_RUNNING:
case TASK_WAKING:
break;
@@ -4086,7 +4087,7 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
* nobody will actually run it, and a signal or other external
* event cannot wake it up and insert it on the runqueue either.
*/
- p->state = TASK_NEW;
+ p->__state = TASK_NEW;
/*
* Make sure we do not leak PI boosting priority to the child.
@@ -4192,7 +4193,7 @@ void wake_up_new_task(struct task_struct *p)
struct rq *rq;
raw_spin_lock_irqsave(&p->pi_lock, rf.flags);
- p->state = TASK_RUNNING;
+ WRITE_ONCE(p->__state, TASK_RUNNING);
#ifdef CONFIG_SMP
/*
* Fork balancing, do it here and not earlier because:
@@ -4554,7 +4555,7 @@ static struct rq *finish_task_switch(struct task_struct *prev)
* running on another CPU and we could rave with its RUNNING -> DEAD
* transition, resulting in a double drop.
*/
- prev_state = prev->state;
+ prev_state = READ_ONCE(prev->__state);
vtime_task_switch(prev);
perf_event_task_sched_in(prev, current);
finish_task(prev);
@@ -5248,7 +5249,7 @@ static inline void schedule_debug(struct task_struct *prev, bool preempt)
#endif
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
- if (!preempt && prev->state && prev->non_block_count) {
+ if (!preempt && READ_ONCE(prev->__state) && prev->non_block_count) {
printk(KERN_ERR "BUG: scheduling in a non-blocking section: %s/%d/%i\n",
prev->comm, prev->pid, prev->non_block_count);
dump_stack();
@@ -5874,10 +5875,10 @@ static void __sched notrace __schedule(bool preempt)
* - we form a control dependency vs deactivate_task() below.
* - ptrace_{,un}freeze_traced() can change ->state underneath us.
*/
- prev_state = prev->state;
+ prev_state = READ_ONCE(prev->__state);
if (!preempt && prev_state) {
if (signal_pending_state(prev_state, prev)) {
- prev->state = TASK_RUNNING;
+ WRITE_ONCE(prev->__state, TASK_RUNNING);
} else {
prev->sched_contributes_to_load =
(prev_state & TASK_UNINTERRUPTIBLE) &&
@@ -6049,7 +6050,7 @@ void __sched schedule_idle(void)
* current task can be in any other state. Note, idle is always in the
* TASK_RUNNING state.
*/
- WARN_ON_ONCE(current->state);
+ WARN_ON_ONCE(current->__state);
do {
__schedule(false);
} while (need_resched());
@@ -8176,26 +8177,28 @@ EXPORT_SYMBOL_GPL(sched_show_task);
static inline bool
state_filter_match(unsigned long state_filter, struct task_struct *p)
{
+ unsigned int state = READ_ONCE(p->__state);
+
/* no filter, everything matches */
if (!state_filter)
return true;
/* filter, but doesn't match */
- if (!(p->state & state_filter))
+ if (!(state & state_filter))
return false;
/*
* When looking for TASK_UNINTERRUPTIBLE skip TASK_IDLE (allows
* TASK_KILLABLE).
*/
- if (state_filter == TASK_UNINTERRUPTIBLE && p->state == TASK_IDLE)
+ if (state_filter == TASK_UNINTERRUPTIBLE && state == TASK_IDLE)
return false;
return true;
}
-void show_state_filter(unsigned long state_filter)
+void show_state_filter(unsigned int state_filter)
{
struct task_struct *g, *p;
@@ -8252,7 +8255,7 @@ void __init init_idle(struct task_struct *idle, int cpu)
raw_spin_lock_irqsave(&idle->pi_lock, flags);
raw_spin_rq_lock(rq);
- idle->state = TASK_RUNNING;
+ idle->__state = TASK_RUNNING;
idle->se.exec_start = sched_clock();
/*
* PF_KTHREAD should already be set at this point; regardless, make it
@@ -9567,7 +9570,7 @@ static int cpu_cgroup_can_attach(struct cgroup_taskset *tset)
* has happened. This would lead to problems with PELT, due to
* move wanting to detach+attach while we're not attached yet.
*/
- if (task->state == TASK_NEW)
+ if (READ_ONCE(task->__state) == TASK_NEW)
ret = -EINVAL;
raw_spin_unlock_irq(&task->pi_lock);
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 3829c5a1b936..22878cd5bd70 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -348,10 +348,10 @@ static void task_non_contending(struct task_struct *p)
if ((zerolag_time < 0) || hrtimer_active(&dl_se->inactive_timer)) {
if (dl_task(p))
sub_running_bw(dl_se, dl_rq);
- if (!dl_task(p) || p->state == TASK_DEAD) {
+ if (!dl_task(p) || READ_ONCE(p->__state) == TASK_DEAD) {
struct dl_bw *dl_b = dl_bw_of(task_cpu(p));
- if (p->state == TASK_DEAD)
+ if (READ_ONCE(p->__state) == TASK_DEAD)
sub_rq_bw(&p->dl, &rq->dl);
raw_spin_lock(&dl_b->lock);
__dl_sub(dl_b, p->dl.dl_bw, dl_bw_cpus(task_cpu(p)));
@@ -1355,10 +1355,10 @@ static enum hrtimer_restart inactive_task_timer(struct hrtimer *timer)
sched_clock_tick();
update_rq_clock(rq);
- if (!dl_task(p) || p->state == TASK_DEAD) {
+ if (!dl_task(p) || READ_ONCE(p->__state) == TASK_DEAD) {
struct dl_bw *dl_b = dl_bw_of(task_cpu(p));
- if (p->state == TASK_DEAD && dl_se->dl_non_contending) {
+ if (READ_ONCE(p->__state) == TASK_DEAD && dl_se->dl_non_contending) {
sub_running_bw(&p->dl, dl_rq_of_se(&p->dl));
sub_rq_bw(&p->dl, dl_rq_of_se(&p->dl));
dl_se->dl_non_contending = 0;
@@ -1722,7 +1722,7 @@ static void migrate_task_rq_dl(struct task_struct *p, int new_cpu __maybe_unused
{
struct rq *rq;
- if (p->state != TASK_WAKING)
+ if (READ_ONCE(p->__state) != TASK_WAKING)
return;
rq = task_rq(p);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5d1a6aace138..7b8990fd4896 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -993,11 +993,14 @@ update_stats_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
if ((flags & DEQUEUE_SLEEP) && entity_is_task(se)) {
struct task_struct *tsk = task_of(se);
+ unsigned int state;
- if (tsk->state & TASK_INTERRUPTIBLE)
+ /* XXX racy against TTWU */
+ state = READ_ONCE(tsk->__state);
+ if (state & TASK_INTERRUPTIBLE)
__schedstat_set(se->statistics.sleep_start,
rq_clock(rq_of(cfs_rq)));
- if (tsk->state & TASK_UNINTERRUPTIBLE)
+ if (state & TASK_UNINTERRUPTIBLE)
__schedstat_set(se->statistics.block_start,
rq_clock(rq_of(cfs_rq)));
}
@@ -6888,7 +6891,7 @@ static void migrate_task_rq_fair(struct task_struct *p, int new_cpu)
* min_vruntime -- the latter is done by enqueue_entity() when placing
* the task on the new runqueue.
*/
- if (p->state == TASK_WAKING) {
+ if (READ_ONCE(p->__state) == TASK_WAKING) {
struct sched_entity *se = &p->se;
struct cfs_rq *cfs_rq = cfs_rq_of(se);
u64 min_vruntime;
@@ -11053,7 +11056,7 @@ static inline bool vruntime_normalized(struct task_struct *p)
* waiting for actually being woken up by sched_ttwu_pending().
*/
if (!se->sum_exec_runtime ||
- (p->state == TASK_WAKING && p->sched_remote_wakeup))
+ (READ_ONCE(p->__state) == TASK_WAKING && p->sched_remote_wakeup))
return true;
return false;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 10:32:06 +0100