diff options
| -rw-r--r-- | include/linux/sched/task.h | 27 |
1 files changed, 10 insertions, 17 deletions
diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h index c517dbc242f7..ea41795a352b 100644 --- a/include/linux/sched/task.h +++ b/include/linux/sched/task.h @@ -131,24 +131,17 @@ static inline void put_task_struct(struct task_struct *t) return; /* - * In !RT, it is always safe to call __put_task_struct(). - * Under RT, we can only call it in preemptible context. - */ - if (!IS_ENABLED(CONFIG_PREEMPT_RT) || preemptible()) { - static DEFINE_WAIT_OVERRIDE_MAP(put_task_map, LD_WAIT_SLEEP); - - lock_map_acquire_try(&put_task_map); - __put_task_struct(t); - lock_map_release(&put_task_map); - return; - } - - /* - * under PREEMPT_RT, we can't call put_task_struct + * Under PREEMPT_RT, we can't call __put_task_struct * in atomic context because it will indirectly - * acquire sleeping locks. + * acquire sleeping locks. The same is true if the + * current process has a mutex enqueued (blocked on + * a PI chain). + * + * In !RT, it is always safe to call __put_task_struct(). + * Though, in order to simplify the code, resort to the + * deferred call too. * - * call_rcu() will schedule delayed_put_task_struct_rcu() + * call_rcu() will schedule __put_task_struct_rcu_cb() * to be called in process context. * * __put_task_struct() is called when @@ -161,7 +154,7 @@ static inline void put_task_struct(struct task_struct *t) * * delayed_free_task() also uses ->rcu, but it is only called * when it fails to fork a process. Therefore, there is no - * way it can conflict with put_task_struct(). + * way it can conflict with __put_task_struct(). */ call_rcu(&t->rcu, __put_task_struct_rcu_cb); } |