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SubjectRe: [PATCH v3] do_wait: make PIDTYPE_PID case O(1) instead of O(n)
On 03/10, Jim Newsome wrote:
>
> On 3/10/21 16:40, Eric W. Biederman wrote:
>
> >> +static int do_wait_pid(struct wait_opts *wo)
> >> +{
> >> + struct task_struct *target = pid_task(wo->wo_pid, PIDTYPE_PID);
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > This is subtle change in behavior.
> >
> > Today on the task->children list we only place thread group leaders.
>
> Shouldn't we allow waiting on clone children if __WALL or __WCLONE is set?

Don't confuse clone child with child's sub-thread.

Oleg.

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