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SubjectRe: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR API
> -		task_active_pid_ns(current)->last_pid);
> + task_active_pid_ns(current)->idr.idr_next-1);

I think we want a well documented helper for this pattern instead
of poking into the internals.

Also is last - 1 always the correct answer? Even with idr_alloc_cyclic
we could wrap around, couldn't we?

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