Re: [PATCH] Don't apply for write lock on tasklist_lock if parentdoesn't ptrace other processes

[Roland McGrath]

> > @@ -331,6 +331,9 @@ void exit_ptrace(struct task_struct *tra
> >  	struct task_struct *p, *n;
> >  	LIST_HEAD(ptrace_dead);
> >  
> > +	if (list_empty(&tracer->ptraced))
> > +		return;
> > +
> >  	write_lock_irq(&tasklist_lock);
> >  	list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
> >  		if (__ptrace_detach(tracer, p))

I think we may have tried that before.  Oleg can tell us if it's really
safe vs a race with PTRACE_TRACEME or something like that.


Thanks,
Roland
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