To allow signal_group_exit to be simplfied so that it can only test signal->flags. Add a new flag SIGNAL_GROUP_DETHREAD, that is set and cleared where de_thread sets and clears group_exit_task today.
Signed-off-by: "Eric W. Biederman" <[email protected]> --- fs/exec.c | 3 +++ include/linux/sched/signal.h | 1 + 2 files changed, 4 insertions(+) diff --git a/fs/exec.c b/fs/exec.c index 33b5d9229c01..9c4c1ab8f715 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1145,6 +1145,7 @@ static int de_thread(struct task_struct *tsk) return -EAGAIN; } + sig->flags |= SIGNAL_GROUP_DETHREAD; sig->group_exit_task = tsk; sig->notify_count = zap_other_threads(tsk); if (!thread_group_leader(tsk)) @@ -1244,6 +1245,7 @@ static int de_thread(struct task_struct *tsk) } spin_lock_irq(lock); + sig->flags &= ~SIGNAL_GROUP_DETHREAD; sig->group_exit_task = NULL; sig->notify_count = 0; spin_unlock_irq(lock); @@ -1259,6 +1261,7 @@ static int de_thread(struct task_struct *tsk) /* protects against exit_notify() and __exit_signal() */ read_lock_irq(&tasklist_lock); spin_lock(lock); + sig->flags &= ~SIGNAL_GROUP_DETHREAD; sig->group_exit_task = NULL; sig->notify_count = 0; spin_unlock(lock); diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h index b4f36a11be5e..5ff8697b21cd 100644 --- a/include/linux/sched/signal.h +++ b/include/linux/sched/signal.h @@ -253,6 +253,7 @@ struct signal_struct { /* Signal group actions. */ #define SIGNAL_GROUP_EXIT 0x00000100 /* group exit in progress */ #define SIGNAL_GROUP_COREDUMP 0x00000200 /* coredump in progress */ +#define SIGNAL_GROUP_DETHREAD 0x00000400 /* exec de_thread in progress */ /* Flags applicable to the entire signal group. */ #define SIGNAL_UNKILLABLE 0x00001000 /* for init: ignore fatal signals */ -- 2.20.1
