linux-kernel - Re: [PATCH 11/12] pid: rewrite task helper functions avoiding task->pid and task->tgid

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Message-ID: <20131217094840.GP3694@twins.programming.kicks-ass.net>
Date:	Tue, 17 Dec 2013 10:48:40 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, Eric Paris <eparis@...hat.com>,
	linux-kernel@...r.kernel.org, linux-audit@...hat.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Serge E. Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH 11/12] pid: rewrite task helper functions avoiding
 task->pid and task->tgid

On Tue, Dec 17, 2013 at 10:34:42AM +0100, Peter Zijlstra wrote:
> On Mon, Dec 16, 2013 at 05:20:51PM -0500, Richard Guy Briggs wrote:
> 
>  >  static inline bool is_idle_task(const struct task_struct *p)
>  >  {
>  > -	return p->pid == 0;
>  > +	return task_pid(p) == &init_struct_pid;
>  >  }
> 
> > I'll stick with task_pid_nr(p) == 0.
> 
> We're going to probably switch to:
> 
>   return p->flags & PF_IDLE;
> 
> Soon, because people are playing silly tricks and want normal threads
> to temporarily appear to be the idle thread (idle time injection).

See http://marc.info/?l=linux-kernel&m=138548236506953&w=2 for more
context.
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