stack_refcount 1256 include/linux/sched.h refcount_t stack_refcount; stack_refcount 64 include/linux/sched/task_stack.h return refcount_inc_not_zero(&tsk->stack_refcount) ? stack_refcount 63 init/init_task.c .stack_refcount = REFCOUNT_INIT(1), stack_refcount 447 kernel/fork.c if (refcount_dec_and_test(&tsk->stack_refcount)) stack_refcount 465 kernel/fork.c WARN_ON_ONCE(refcount_read(&tsk->stack_refcount) != 0); stack_refcount 890 kernel/fork.c refcount_set(&tsk->stack_refcount, 1);