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pids: Compute task_tgid using signal->leader_pid

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The cost is the the same and this removes the need
to worry about complications that come from de_thread
and group_leader changing.

__task_pid_nr_ns has been updated to take advantage of this change.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2017-09-26 12:45:33 -05:00
parent 1fb53567a3
commit 7a36094d61
9 changed files with 22 additions and 17 deletions
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5
include/linux/sched.h
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@@ -1202,11 +1202,6 @@ static inline struct pid *task_pid(struct task_struct *task)
return task->pids[PIDTYPE_PID].pid;
}
static inline struct pid *task_tgid(struct task_struct *task)
{
return task->group_leader->pids[PIDTYPE_PID].pid;
}
/*
* Without tasklist or RCU lock it is not safe to dereference
* the result of task_pgrp/task_session even if task == current,