sukadev@us.ibm.com writes:

> From: Sukadev Bhattiprolu <sukadev@us.ibm.com>
> Subject: [RFC][PATCH 03/14] use pid_nr in procfs
>
> With containers, a process can have different pid_t values in different
> pid namespaces. To ensure we get the correct pid_t value in any context,
> we should use pid_nr() function rather than directly accessing either
> task->pid or pid->nr.

I almost agree here.

However pid_nr looks at current to figure out which pid namespace to
find the pid in.  In the case of procfs we need to look at the
pid_namespace from the super block.

Eric
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