return probe not executed on SMP system

[Hien Nguyen]

>I grep the systemTap source code, and found in line 2590 of tapsets.cxx:
>
> o->newline() << probe_name << ".maxactive = 1;";
>
>So systemTap set the maxactive to 1. Am I right?
>
>  
>
Confirm! You are right, systemtap set maxactive=1. It should set it to 0 
or do not set it at all so kprobes can set it to the default value.