[PATCH 0/3] proc: first_tid() fix/cleanup

[Oleg Nesterov]

Hello.

next_thread() should be avoided, probably next_tid() is the
only "valid" user.

But now we have another reason to avoid (and probably even kill)
it, we are going to replace or fix while_each_thread(), almost
every lockless usage is wrong.

I was going to send more changes, but this initial series nearly
killed me. And I think first_tid() needs another cleanup, ->f_pos
truncation doesn't look nice, tomorrow.

Oleg.

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