job control: rename signal->group_stop and flags to jobctl and update them
signal->group_stop currently hosts mostly group stop related flags; however, it's gonna be used for wider purposes and the GROUP_STOP_ flag prefix becomes confusing. Rename signal->group_stop to signal->jobctl and rename all GROUP_STOP_* flags to JOBCTL_*. Bit position macros JOBCTL_*_BIT are defined and JOBCTL_* flags are defined in terms of them to allow using bitops later. While at it, reassign JOBCTL_TRAPPING to bit 22 to better accomodate future additions. This doesn't cause any functional change. -v2: JOBCTL_*_BIT macros added as suggested by Linus. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
This commit is contained in:
parent
0b1007c357
commit
a8f072c1d6
@ -1772,7 +1772,7 @@ static int zap_process(struct task_struct *start, int exit_code)
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t = start;
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do {
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task_clear_group_stop_pending(t);
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task_clear_jobctl_stop_pending(t);
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if (t != current && t->mm) {
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sigaddset(&t->pending.signal, SIGKILL);
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signal_wake_up(t, 1);
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@ -1282,7 +1282,7 @@ struct task_struct {
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int exit_state;
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int exit_code, exit_signal;
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int pdeath_signal; /* The signal sent when the parent dies */
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unsigned int group_stop; /* GROUP_STOP_*, siglock protected */
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unsigned int jobctl; /* JOBCTL_*, siglock protected */
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/* ??? */
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unsigned int personality;
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unsigned did_exec:1;
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@ -1803,15 +1803,21 @@ extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *
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#define used_math() tsk_used_math(current)
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/*
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* task->group_stop flags
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* task->jobctl flags
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*/
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#define GROUP_STOP_SIGMASK 0xffff /* signr of the last group stop */
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#define GROUP_STOP_PENDING (1 << 16) /* task should stop for group stop */
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#define GROUP_STOP_CONSUME (1 << 17) /* consume group stop count */
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#define GROUP_STOP_TRAPPING (1 << 18) /* switching from STOPPED to TRACED */
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#define GROUP_STOP_DEQUEUED (1 << 19) /* stop signal dequeued */
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#define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
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extern void task_clear_group_stop_pending(struct task_struct *task);
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#define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
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#define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
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#define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
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#define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
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#define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
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#define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
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#define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
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#define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
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extern void task_clear_jobctl_stop_pending(struct task_struct *task);
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#ifdef CONFIG_PREEMPT_RCU
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@ -77,13 +77,13 @@ void __ptrace_unlink(struct task_struct *child)
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spin_lock(&child->sighand->siglock);
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/*
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* Reinstate GROUP_STOP_PENDING if group stop is in effect and
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* Reinstate JOBCTL_STOP_PENDING if group stop is in effect and
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* @child isn't dead.
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*/
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if (!(child->flags & PF_EXITING) &&
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(child->signal->flags & SIGNAL_STOP_STOPPED ||
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child->signal->group_stop_count))
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child->group_stop |= GROUP_STOP_PENDING;
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child->jobctl |= JOBCTL_STOP_PENDING;
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/*
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* If transition to TASK_STOPPED is pending or in TASK_TRACED, kick
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@ -91,7 +91,7 @@ void __ptrace_unlink(struct task_struct *child)
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* is in TASK_TRACED; otherwise, we might unduly disrupt
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* TASK_KILLABLE sleeps.
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*/
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if (child->group_stop & GROUP_STOP_PENDING || task_is_traced(child))
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if (child->jobctl & JOBCTL_STOP_PENDING || task_is_traced(child))
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signal_wake_up(child, task_is_traced(child));
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spin_unlock(&child->sighand->siglock);
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@ -226,7 +226,7 @@ static int ptrace_attach(struct task_struct *task)
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spin_lock(&task->sighand->siglock);
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/*
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* If the task is already STOPPED, set GROUP_STOP_PENDING and
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* If the task is already STOPPED, set JOBCTL_STOP_PENDING and
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* TRAPPING, and kick it so that it transits to TRACED. TRAPPING
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* will be cleared if the child completes the transition or any
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* event which clears the group stop states happens. We'll wait
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@ -243,7 +243,7 @@ static int ptrace_attach(struct task_struct *task)
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* in and out of STOPPED are protected by siglock.
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*/
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if (task_is_stopped(task)) {
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task->group_stop |= GROUP_STOP_PENDING | GROUP_STOP_TRAPPING;
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task->jobctl |= JOBCTL_STOP_PENDING | JOBCTL_TRAPPING;
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signal_wake_up(task, 1);
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}
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@ -257,7 +257,7 @@ unlock_creds:
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out:
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if (!retval)
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wait_event(current->signal->wait_chldexit,
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!(task->group_stop & GROUP_STOP_TRAPPING));
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!(task->jobctl & JOBCTL_TRAPPING));
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return retval;
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}
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@ -124,7 +124,7 @@ static inline int has_pending_signals(sigset_t *signal, sigset_t *blocked)
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static int recalc_sigpending_tsk(struct task_struct *t)
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{
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if ((t->group_stop & GROUP_STOP_PENDING) ||
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if ((t->jobctl & JOBCTL_STOP_PENDING) ||
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PENDING(&t->pending, &t->blocked) ||
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PENDING(&t->signal->shared_pending, &t->blocked)) {
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set_tsk_thread_flag(t, TIF_SIGPENDING);
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@ -224,27 +224,28 @@ static inline void print_dropped_signal(int sig)
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}
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/**
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* task_clear_group_stop_trapping - clear group stop trapping bit
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* task_clear_jobctl_trapping - clear jobctl trapping bit
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* @task: target task
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*
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* If GROUP_STOP_TRAPPING is set, a ptracer is waiting for us. Clear it
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* and wake up the ptracer. Note that we don't need any further locking.
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* @task->siglock guarantees that @task->parent points to the ptracer.
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* If JOBCTL_TRAPPING is set, a ptracer is waiting for us to enter TRACED.
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* Clear it and wake up the ptracer. Note that we don't need any further
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* locking. @task->siglock guarantees that @task->parent points to the
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* ptracer.
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*
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* CONTEXT:
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* Must be called with @task->sighand->siglock held.
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*/
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static void task_clear_group_stop_trapping(struct task_struct *task)
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static void task_clear_jobctl_trapping(struct task_struct *task)
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{
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if (unlikely(task->group_stop & GROUP_STOP_TRAPPING)) {
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task->group_stop &= ~GROUP_STOP_TRAPPING;
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if (unlikely(task->jobctl & JOBCTL_TRAPPING)) {
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task->jobctl &= ~JOBCTL_TRAPPING;
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__wake_up_sync_key(&task->parent->signal->wait_chldexit,
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TASK_UNINTERRUPTIBLE, 1, task);
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}
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}
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/**
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* task_clear_group_stop_pending - clear pending group stop
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* task_clear_jobctl_stop_pending - clear pending group stop
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* @task: target task
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*
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* Clear group stop states for @task.
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@ -252,19 +253,19 @@ static void task_clear_group_stop_trapping(struct task_struct *task)
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* CONTEXT:
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* Must be called with @task->sighand->siglock held.
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*/
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void task_clear_group_stop_pending(struct task_struct *task)
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void task_clear_jobctl_stop_pending(struct task_struct *task)
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{
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task->group_stop &= ~(GROUP_STOP_PENDING | GROUP_STOP_CONSUME |
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GROUP_STOP_DEQUEUED);
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task->jobctl &= ~(JOBCTL_STOP_PENDING | JOBCTL_STOP_CONSUME |
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JOBCTL_STOP_DEQUEUED);
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}
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/**
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* task_participate_group_stop - participate in a group stop
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* @task: task participating in a group stop
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*
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* @task has GROUP_STOP_PENDING set and is participating in a group stop.
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* @task has %JOBCTL_STOP_PENDING set and is participating in a group stop.
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* Group stop states are cleared and the group stop count is consumed if
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* %GROUP_STOP_CONSUME was set. If the consumption completes the group
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* %JOBCTL_STOP_CONSUME was set. If the consumption completes the group
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* stop, the appropriate %SIGNAL_* flags are set.
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*
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* CONTEXT:
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@ -277,11 +278,11 @@ void task_clear_group_stop_pending(struct task_struct *task)
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static bool task_participate_group_stop(struct task_struct *task)
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{
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struct signal_struct *sig = task->signal;
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bool consume = task->group_stop & GROUP_STOP_CONSUME;
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bool consume = task->jobctl & JOBCTL_STOP_CONSUME;
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WARN_ON_ONCE(!(task->group_stop & GROUP_STOP_PENDING));
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WARN_ON_ONCE(!(task->jobctl & JOBCTL_STOP_PENDING));
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task_clear_group_stop_pending(task);
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task_clear_jobctl_stop_pending(task);
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if (!consume)
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return false;
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@ -604,7 +605,7 @@ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
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* is to alert stop-signal processing code when another
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* processor has come along and cleared the flag.
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*/
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current->group_stop |= GROUP_STOP_DEQUEUED;
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current->jobctl |= JOBCTL_STOP_DEQUEUED;
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}
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if ((info->si_code & __SI_MASK) == __SI_TIMER && info->si_sys_private) {
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/*
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@ -809,7 +810,7 @@ static int prepare_signal(int sig, struct task_struct *p, int from_ancestor_ns)
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rm_from_queue(SIG_KERNEL_STOP_MASK, &signal->shared_pending);
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t = p;
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do {
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task_clear_group_stop_pending(t);
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task_clear_jobctl_stop_pending(t);
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rm_from_queue(SIG_KERNEL_STOP_MASK, &t->pending);
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wake_up_state(t, __TASK_STOPPED);
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} while_each_thread(p, t);
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@ -925,7 +926,7 @@ static void complete_signal(int sig, struct task_struct *p, int group)
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signal->group_stop_count = 0;
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t = p;
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do {
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task_clear_group_stop_pending(t);
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task_clear_jobctl_stop_pending(t);
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sigaddset(&t->pending.signal, SIGKILL);
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signal_wake_up(t, 1);
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} while_each_thread(p, t);
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@ -1160,7 +1161,7 @@ int zap_other_threads(struct task_struct *p)
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p->signal->group_stop_count = 0;
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while_each_thread(p, t) {
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task_clear_group_stop_pending(t);
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task_clear_jobctl_stop_pending(t);
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count++;
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/* Don't bother with already dead threads */
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@ -1738,7 +1739,7 @@ static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info)
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* clear now. We act as if SIGCONT is received after TASK_TRACED
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* is entered - ignore it.
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*/
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if (why == CLD_STOPPED && (current->group_stop & GROUP_STOP_PENDING))
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if (why == CLD_STOPPED && (current->jobctl & JOBCTL_STOP_PENDING))
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gstop_done = task_participate_group_stop(current);
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current->last_siginfo = info;
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@ -1751,12 +1752,12 @@ static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info)
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set_current_state(TASK_TRACED);
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/*
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* We're committing to trapping. Clearing GROUP_STOP_TRAPPING and
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* We're committing to trapping. Clearing JOBCTL_TRAPPING and
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* transition to TASK_TRACED should be atomic with respect to
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* siglock. This hsould be done after the arch hook as siglock is
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* siglock. This should be done after the arch hook as siglock is
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* released and regrabbed across it.
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*/
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task_clear_group_stop_trapping(current);
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task_clear_jobctl_trapping(current);
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spin_unlock_irq(¤t->sighand->siglock);
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read_lock(&tasklist_lock);
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@ -1792,9 +1793,9 @@ static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info)
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*
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* If @gstop_done, the ptracer went away between group stop
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* completion and here. During detach, it would have set
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* GROUP_STOP_PENDING on us and we'll re-enter TASK_STOPPED
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* in do_signal_stop() on return, so notifying the real
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* parent of the group stop completion is enough.
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* JOBCTL_STOP_PENDING on us and we'll re-enter
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* TASK_STOPPED in do_signal_stop() on return, so notifying
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* the real parent of the group stop completion is enough.
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*/
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if (gstop_done)
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do_notify_parent_cldstop(current, false, why);
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@ -1856,14 +1857,14 @@ static int do_signal_stop(int signr)
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{
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struct signal_struct *sig = current->signal;
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if (!(current->group_stop & GROUP_STOP_PENDING)) {
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unsigned int gstop = GROUP_STOP_PENDING | GROUP_STOP_CONSUME;
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if (!(current->jobctl & JOBCTL_STOP_PENDING)) {
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unsigned int gstop = JOBCTL_STOP_PENDING | JOBCTL_STOP_CONSUME;
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struct task_struct *t;
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/* signr will be recorded in task->group_stop for retries */
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WARN_ON_ONCE(signr & ~GROUP_STOP_SIGMASK);
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/* signr will be recorded in task->jobctl for retries */
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WARN_ON_ONCE(signr & ~JOBCTL_STOP_SIGMASK);
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if (!likely(current->group_stop & GROUP_STOP_DEQUEUED) ||
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if (!likely(current->jobctl & JOBCTL_STOP_DEQUEUED) ||
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unlikely(signal_group_exit(sig)))
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return 0;
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/*
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@ -1890,19 +1891,19 @@ static int do_signal_stop(int signr)
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else
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WARN_ON_ONCE(!task_ptrace(current));
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current->group_stop &= ~GROUP_STOP_SIGMASK;
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current->group_stop |= signr | gstop;
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current->jobctl &= ~JOBCTL_STOP_SIGMASK;
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current->jobctl |= signr | gstop;
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sig->group_stop_count = 1;
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for (t = next_thread(current); t != current;
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t = next_thread(t)) {
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t->group_stop &= ~GROUP_STOP_SIGMASK;
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t->jobctl &= ~JOBCTL_STOP_SIGMASK;
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/*
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* Setting state to TASK_STOPPED for a group
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* stop is always done with the siglock held,
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* so this check has no races.
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*/
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if (!(t->flags & PF_EXITING) && !task_is_stopped(t)) {
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t->group_stop |= signr | gstop;
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t->jobctl |= signr | gstop;
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sig->group_stop_count++;
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signal_wake_up(t, 0);
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}
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@ -1943,23 +1944,23 @@ retry:
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spin_lock_irq(¤t->sighand->siglock);
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} else {
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ptrace_stop(current->group_stop & GROUP_STOP_SIGMASK,
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ptrace_stop(current->jobctl & JOBCTL_STOP_SIGMASK,
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CLD_STOPPED, 0, NULL);
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current->exit_code = 0;
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}
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/*
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* GROUP_STOP_PENDING could be set if another group stop has
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* JOBCTL_STOP_PENDING could be set if another group stop has
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* started since being woken up or ptrace wants us to transit
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* between TASK_STOPPED and TRACED. Retry group stop.
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*/
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if (current->group_stop & GROUP_STOP_PENDING) {
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WARN_ON_ONCE(!(current->group_stop & GROUP_STOP_SIGMASK));
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if (current->jobctl & JOBCTL_STOP_PENDING) {
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WARN_ON_ONCE(!(current->jobctl & JOBCTL_STOP_SIGMASK));
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goto retry;
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}
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/* PTRACE_ATTACH might have raced with task killing, clear trapping */
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task_clear_group_stop_trapping(current);
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task_clear_jobctl_trapping(current);
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spin_unlock_irq(¤t->sighand->siglock);
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@ -2078,8 +2079,8 @@ relock:
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if (unlikely(signr != 0))
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ka = return_ka;
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else {
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if (unlikely(current->group_stop &
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GROUP_STOP_PENDING) && do_signal_stop(0))
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if (unlikely(current->jobctl & JOBCTL_STOP_PENDING) &&
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do_signal_stop(0))
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goto relock;
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signr = dequeue_signal(current, ¤t->blocked,
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@ -2253,7 +2254,7 @@ void exit_signals(struct task_struct *tsk)
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signotset(&unblocked);
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retarget_shared_pending(tsk, &unblocked);
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if (unlikely(tsk->group_stop & GROUP_STOP_PENDING) &&
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if (unlikely(tsk->jobctl & JOBCTL_STOP_PENDING) &&
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task_participate_group_stop(tsk))
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group_stop = CLD_STOPPED;
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out:
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Block a user