how does oprofile_setup() function gets called

[soumen a. <ary...@gm...>]

Hi all,

                  I was looking through oprofile module code.  Correct me if
I am wrong, during opcontrol command, it does the init functionality
where arch dependent nmi_init, oprofilefs_register is done.

Can anybody help me to clear my doubt about, how does "oprofile_setup()"
declared in oprof.c gets called, I mean who is calling the function.

Thanks in advance,

Soumen Acharya