diff options
| -rw-r--r-- | include/linux/init_task.h | 2 | ||||
| -rw-r--r-- | include/linux/sched.h | 4 | ||||
| -rw-r--r-- | kernel/exit.c | 5 | ||||
| -rw-r--r-- | kernel/fork.c | 8 |
4 files changed, 8 insertions, 11 deletions
diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 7996fc2c9ba..0551e0dcb71 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -16,7 +16,7 @@ extern struct files_struct init_files; extern struct fs_struct init_fs; #define INIT_SIGNALS(sig) { \ - .count = ATOMIC_INIT(1), \ + .nr_threads = 1, \ .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\ .shared_pending = { \ .list = LIST_HEAD_INIT(sig.shared_pending.list), \ diff --git a/include/linux/sched.h b/include/linux/sched.h index ccd2d150072..f118809c953 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -527,8 +527,8 @@ struct thread_group_cputimer { */ struct signal_struct { atomic_t sigcnt; - atomic_t count; atomic_t live; + int nr_threads; wait_queue_head_t wait_chldexit; /* for wait4() */ @@ -2149,7 +2149,7 @@ extern bool current_is_single_threaded(void); static inline int get_nr_threads(struct task_struct *tsk) { - return atomic_read(&tsk->signal->count); + return tsk->signal->nr_threads; } /* de_thread depends on thread_group_leader not being a pid based check */ diff --git a/kernel/exit.c b/kernel/exit.c index 357d443d5a0..ceffc67b564 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -83,14 +83,10 @@ static void __exit_signal(struct task_struct *tsk) struct sighand_struct *sighand; struct tty_struct *uninitialized_var(tty); - BUG_ON(!sig); - BUG_ON(!atomic_read(&sig->count)); - sighand = rcu_dereference_check(tsk->sighand, rcu_read_lock_held() || lockdep_tasklist_lock_is_held()); spin_lock(&sighand->siglock); - atomic_dec(&sig->count); posix_cpu_timers_exit(tsk); if (group_dead) { @@ -130,6 +126,7 @@ static void __exit_signal(struct task_struct *tsk) sig->sum_sched_runtime += tsk->se.sum_exec_runtime; } + sig->nr_threads--; __unhash_process(tsk, group_dead); /* diff --git a/kernel/fork.c b/kernel/fork.c index 40cd099cfc1..d32410bd4be 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -877,9 +877,9 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) if (!sig) return -ENOMEM; - atomic_set(&sig->sigcnt, 1); - atomic_set(&sig->count, 1); + sig->nr_threads = 1; atomic_set(&sig->live, 1); + atomic_set(&sig->sigcnt, 1); init_waitqueue_head(&sig->wait_chldexit); if (clone_flags & CLONE_NEWPID) sig->flags |= SIGNAL_UNKILLABLE; @@ -1256,9 +1256,9 @@ static struct task_struct *copy_process(unsigned long clone_flags, } if (clone_flags & CLONE_THREAD) { - atomic_inc(¤t->signal->sigcnt); - atomic_inc(¤t->signal->count); + current->signal->nr_threads++; atomic_inc(¤t->signal->live); + atomic_inc(¤t->signal->sigcnt); p->group_leader = current->group_leader; list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group); } |