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8feebc6713
Replace has_group_leader_pid with thread_group_leader. Years ago Oleg suggested changing thread_group_leader to has_group_leader_pid to handle races. Looking at the code then and now I don't see how it ever helped. Especially as then the code really did need to be the thread_group_leader. Today it doesn't make a difference if thread_group_leader races with de_thread as the task returned from lookup_task in the non-thread case is just used to find values in task->signal. Since the races with de_thread have never been handled revert has_group_header_pid to thread_group_leader for clarity. Update the comment in lookup_task to remove implementation details that are no longer true and to mention task->signal instead of task->sighand, as the relevant cpu timer details are all in task->signal. Ref:55e8c8eb2c("posix-cpu-timers: Store a reference to a pid not a task") Ref:c0deae8c95("posix-cpu-timers: Rcu_read_lock/unlock protect find_task_by_vpid call") Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>