linux-kernel - Re: [PATCH 0/3] proc: first

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Message-ID: <87fvx61htn.fsf@xmission.com>
Date:	Tue, 28 May 2013 22:22:12 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Sergey Dyasly <dserrg@...il.com>,
	Sha Zhengju <handai.szj@...bao.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] proc: first_tid() fix/cleanup

Oleg Nesterov <oleg@...hat.com> writes:

> 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.

I have made some comments but overall this looks like a good set of
cleanups.

Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>

As for f_pos truncation if you want you can safely check
if f_pos is greater than PID_MAX_LIMIT as we will never more
threads than we have pids.

Eric
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