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

[Peter Zijlstra]

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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