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sched: Change task_struct::state

Browse Source 
Change the type and name of task_struct::state. Drop the volatile and
shrink it to an 'unsigned int'. Rename it in order to find all uses
such that we can use READ_ONCE/WRITE_ONCE as appropriate.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20210611082838.550736351@infradead.org
This commit is contained in:
Peter Zijlstra 2021-06-11 10:28:17 +02:00
parent 7c3edd6d9c
commit 2f064a59a1
28 changed files with 123 additions and 111 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/ia64/kernel/mca.c
View File

@ -1788,7 +1788,7 @@ format_mca_init_stack(void *mca_data, unsigned long offset,
ti->task = p;
ti->cpu = cpu;
p->stack = ti;
p->state = TASK_UNINTERRUPTIBLE;
p->__state = TASK_UNINTERRUPTIBLE;
cpumask_set_cpu(cpu, &p->cpus_mask);
INIT_LIST_HEAD(&p->tasks);
p->parent = p->real_parent = p->group_leader = p;

8
arch/ia64/kernel/ptrace.c
View File

@ -641,11 +641,11 @@ ptrace_attach_sync_user_rbs (struct task_struct *child)
read_lock(&tasklist_lock);
if (child->sighand) {
spin_lock_irq(&child->sighand->siglock);
if (child->state == TASK_STOPPED &&
if (READ_ONCE(child->__state) == TASK_STOPPED &&
!test_and_set_tsk_thread_flag(child, TIF_RESTORE_RSE)) {
set_notify_resume(child);
child->state = TASK_TRACED;
WRITE_ONCE(child->__state, TASK_TRACED);
stopped = 1;
}
spin_unlock_irq(&child->sighand->siglock);
@ -665,9 +665,9 @@ ptrace_attach_sync_user_rbs (struct task_struct *child)
read_lock(&tasklist_lock);
if (child->sighand) {
spin_lock_irq(&child->sighand->siglock);
if (child->state == TASK_TRACED &&
if (READ_ONCE(child->__state) == TASK_TRACED &&
(child->signal->flags & SIGNAL_STOP_STOPPED)) {
child->state = TASK_STOPPED;
WRITE_ONCE(child->__state, TASK_STOPPED);
}
spin_unlock_irq(&child->sighand->siglock);
}

13
arch/powerpc/xmon/xmon.c
View File

@ -3162,6 +3162,7 @@ memzcan(void)
static void show_task(struct task_struct *tsk)
{
unsigned int p_state = READ_ONCE(tsk->__state);
char state;
/*
@ -3169,14 +3170,14 @@ static void show_task(struct task_struct *tsk)
* appropriate for calling from xmon. This could be moved
* to a common, generic, routine used by both.
*/
state = (tsk->state == 0) ? 'R' :
(tsk->state < 0) ? 'U' :
(tsk->state & TASK_UNINTERRUPTIBLE) ? 'D' :
(tsk->state & TASK_STOPPED) ? 'T' :
(tsk->state & TASK_TRACED) ? 'C' :
state = (p_state == 0) ? 'R' :
(p_state < 0) ? 'U' :
(p_state & TASK_UNINTERRUPTIBLE) ? 'D' :
(p_state & TASK_STOPPED) ? 'T' :
(p_state & TASK_TRACED) ? 'C' :
(tsk->exit_state & EXIT_ZOMBIE) ? 'Z' :
(tsk->exit_state & EXIT_DEAD) ? 'E' :
(tsk->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
(p_state & TASK_INTERRUPTIBLE) ? 'S' : '?';
printf("%16px %16lx %16px %6d %6d %c %2d %s\n", tsk,
tsk->thread.ksp, tsk->thread.regs,

2
block/blk-mq.c
View File

@ -3886,7 +3886,7 @@ static bool blk_mq_poll_hybrid(struct request_queue *q,
int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin)
{
struct blk_mq_hw_ctx *hctx;
long state;
unsigned int state;
if (!blk_qc_t_valid(cookie) ||
!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))

6
drivers/md/dm.c
View File

@ -2328,7 +2328,7 @@ static bool md_in_flight_bios(struct mapped_device *md)
return sum != 0;
}
static int dm_wait_for_bios_completion(struct mapped_device *md, long task_state)
static int dm_wait_for_bios_completion(struct mapped_device *md, unsigned int task_state)
{
int r = 0;
DEFINE_WAIT(wait);
@ -2351,7 +2351,7 @@ static int dm_wait_for_bios_completion(struct mapped_device *md, long task_state
return r;
}
static int dm_wait_for_completion(struct mapped_device *md, long task_state)
static int dm_wait_for_completion(struct mapped_device *md, unsigned int task_state)
{
int r = 0;
@ -2478,7 +2478,7 @@ static void unlock_fs(struct mapped_device *md)
* are being added to md->deferred list.
*/
static int __dm_suspend(struct mapped_device *md, struct dm_table *map,
unsigned suspend_flags, long task_state,
unsigned suspend_flags, unsigned int task_state,
int dmf_suspended_flag)
{
bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG;

8
fs/binfmt_elf.c
View File

@ -1537,7 +1537,8 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
{
const struct cred *cred;
unsigned int i, len;
unsigned int state;
/* first copy the parameters from user space */
memset(psinfo, 0, sizeof(struct elf_prpsinfo));
@ -1559,7 +1560,8 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
psinfo->pr_pgrp = task_pgrp_vnr(p);
psinfo->pr_sid = task_session_vnr(p);
i = p->state ? ffz(~p->state) + 1 : 0;
state = READ_ONCE(p->__state);
i = state ? ffz(~state) + 1 : 0;
psinfo->pr_state = i;
psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
psinfo->pr_zomb = psinfo->pr_sname == 'Z';
@ -1571,7 +1573,7 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
rcu_read_unlock();
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
return 0;
}

4
fs/binfmt_elf_fdpic.c
View File

@ -1331,6 +1331,7 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
{
const struct cred *cred;
unsigned int i, len;
unsigned int state;
/* first copy the parameters from user space */
memset(psinfo, 0, sizeof(struct elf_prpsinfo));
@ -1353,7 +1354,8 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
psinfo->pr_pgrp = task_pgrp_vnr(p);
psinfo->pr_sid = task_session_vnr(p);
i = p->state ? ffz(~p->state) + 1 : 0;
state = READ_ONCE(p->__state);
i = state ? ffz(~state) + 1 : 0;
psinfo->pr_state = i;
psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
psinfo->pr_zomb = psinfo->pr_sname == 'Z';

4
fs/userfaultfd.c
View File

@ -337,7 +337,7 @@ static inline bool userfaultfd_must_wait(struct userfaultfd_ctx *ctx,
return ret;
}
static inline long userfaultfd_get_blocking_state(unsigned int flags)
static inline unsigned int userfaultfd_get_blocking_state(unsigned int flags)
{
if (flags & FAULT_FLAG_INTERRUPTIBLE)
return TASK_INTERRUPTIBLE;
@ -370,7 +370,7 @@ vm_fault_t handle_userfault(struct vm_fault *vmf, unsigned long reason)
struct userfaultfd_wait_queue uwq;
vm_fault_t ret = VM_FAULT_SIGBUS;
bool must_wait;
long blocking_state;
unsigned int blocking_state;
/*
* We don't do userfault handling for the final child pid update.

31
include/linux/sched.h
View File

@ -113,13 +113,13 @@ struct task_group;
__TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
TASK_PARKED)
#define task_is_running(task) (READ_ONCE((task)->state) == TASK_RUNNING)
#define task_is_running(task) (READ_ONCE((task)->__state) == TASK_RUNNING)
#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
#define task_is_traced(task) ((READ_ONCE(task->__state) & __TASK_TRACED) != 0)
#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
#define task_is_stopped(task) ((READ_ONCE(task->__state) & __TASK_STOPPED) != 0)
#define task_is_stopped_or_traced(task) ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
#define task_is_stopped_or_traced(task) ((READ_ONCE(task->__state) & (__TASK_STOPPED | __TASK_TRACED)) != 0)
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
@ -134,14 +134,14 @@ struct task_group;
do { \
WARN_ON_ONCE(is_special_task_state(state_value));\
current->task_state_change = _THIS_IP_; \
current->state = (state_value); \
WRITE_ONCE(current->__state, (state_value)); \
} while (0)
#define set_current_state(state_value) \
do { \
WARN_ON_ONCE(is_special_task_state(state_value));\
current->task_state_change = _THIS_IP_; \
smp_store_mb(current->state, (state_value)); \
smp_store_mb(current->__state, (state_value)); \
} while (0)
#define set_special_state(state_value) \
@ -150,7 +150,7 @@ struct task_group;
WARN_ON_ONCE(!is_special_task_state(state_value)); \
raw_spin_lock_irqsave(&current->pi_lock, flags); \
current->task_state_change = _THIS_IP_; \
current->state = (state_value); \
WRITE_ONCE(current->__state, (state_value)); \
raw_spin_unlock_irqrestore(&current->pi_lock, flags); \
} while (0)
#else
@ -192,10 +192,10 @@ struct task_group;
* Also see the comments of try_to_wake_up().
*/
#define __set_current_state(state_value) \
current->state = (state_value)
WRITE_ONCE(current->__state, (state_value))
#define set_current_state(state_value) \
smp_store_mb(current->state, (state_value))
smp_store_mb(current->__state, (state_value))
/*
* set_special_state() should be used for those states when the blocking task
@ -207,13 +207,13 @@ struct task_group;
do { \
unsigned long flags; /* may shadow */ \
raw_spin_lock_irqsave(&current->pi_lock, flags); \
current->state = (state_value); \
WRITE_ONCE(current->__state, (state_value)); \
raw_spin_unlock_irqrestore(&current->pi_lock, flags); \
} while (0)
#endif
#define get_current_state() READ_ONCE(current->state)
#define get_current_state() READ_ONCE(current->__state)
/* Task command name length: */
#define TASK_COMM_LEN 16
@ -666,8 +666,7 @@ struct task_struct {
*/
struct thread_info thread_info;
#endif
/* -1 unrunnable, 0 runnable, >0 stopped: */
volatile long state;
unsigned int __state;
/*
* This begins the randomizable portion of task_struct. Only
@ -1532,7 +1531,7 @@ static inline pid_t task_pgrp_nr(struct task_struct *tsk)
static inline unsigned int task_state_index(struct task_struct *tsk)
{
unsigned int tsk_state = READ_ONCE(tsk->state);
unsigned int tsk_state = READ_ONCE(tsk->__state);
unsigned int state = (tsk_state | tsk->exit_state) & TASK_REPORT;
BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX);
@ -1840,10 +1839,10 @@ static __always_inline void scheduler_ipi(void)
*/
preempt_fold_need_resched();
}
extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state);
#else
static inline void scheduler_ipi(void) { }
static inline unsigned long wait_task_inactive(struct task_struct *p, long match_state)
static inline unsigned long wait_task_inactive(struct task_struct *p, unsigned int match_state)
{
return 1;
}

2
include/linux/sched/debug.h
View File

@ -14,7 +14,7 @@ extern void dump_cpu_task(int cpu);
/*
* Only dump TASK_* tasks. (0 for all tasks)
*/
extern void show_state_filter(unsigned long state_filter);
extern void show_state_filter(unsigned int state_filter);
static inline void show_state(void)
{

2
include/linux/sched/signal.h
View File

@ -382,7 +382,7 @@ static inline int fatal_signal_pending(struct task_struct *p)
return task_sigpending(p) && __fatal_signal_pending(p);
}
static inline int signal_pending_state(long state, struct task_struct *p)
static inline int signal_pending_state(unsigned int state, struct task_struct *p)
{
if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
return 0;

2
init/init_task.c
View File

@ -71,7 +71,7 @@ struct task_struct init_task
.thread_info = INIT_THREAD_INFO(init_task),
.stack_refcount = REFCOUNT_INIT(1),
#endif
.state = 0,
.__state = 0,
.stack = init_stack,
.usage = REFCOUNT_INIT(2),
.flags = PF_KTHREAD,

2
kernel/cgroup/cgroup-v1.c
View File

@ -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;

18
kernel/debug/kdb/kdb_support.c
View File

@ -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? */

4
kernel/fork.c
View File

@ -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 @@ static __latent_entropy struct task_struct *copy_process(
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:

2
kernel/hung_task.c
View File

@ -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:

4
kernel/kthread.c
View File

@ -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);
}

6
kernel/locking/mutex.c
View File

@ -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 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
}
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)
{

4
kernel/locking/rtmutex.c
View File

@ -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)
{

2
kernel/locking/rwsem.c
View File

@ -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);

12
kernel/ptrace.c
View File

@ -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;
}
}

4
kernel/rcu/rcutorture.c
View File

@ -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);

12
kernel/rcu/tree_stall.h
View File

@ -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),

53
kernel/sched/core.c
View File

@ -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 @@ int migrate_swap(struct task_struct *cur, struct task_struct *p,
* 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);

10
kernel/sched/deadline.c
View File

@ -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);

11
kernel/sched/fair.c
View File

@ -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;

4
lib/syscall.c
View File

@ -68,13 +68,13 @@ static int collect_syscall(struct task_struct *target, struct syscall_info *info
*/
int task_current_syscall(struct task_struct *target, struct syscall_info *info)
{
long state;
unsigned long ncsw;
unsigned int state;
if (target == current)
return collect_syscall(target, info);
state = target->state;
state = READ_ONCE(target->__state);
if (unlikely(!state))
return -EAGAIN;

2
net/core/dev.c
View File

@ -4363,7 +4363,7 @@ static inline void ____napi_schedule(struct softnet_data *sd,
* makes sure to proceed with napi polling
* if the thread is explicitly woken from here.
*/
if (READ_ONCE(thread->state) != TASK_INTERRUPTIBLE)
if (READ_ONCE(thread->__state) != TASK_INTERRUPTIBLE)
set_bit(NAPI_STATE_SCHED_THREADED, &napi->state);
wake_up_process(thread);
return;