arch/i386/profile/nmi_init.c patch?

[Vasiili G. <vig...@gm...>]

Hello,

     I found the patch to nmi_init.c: 
http://www.ussg.iu.edu/hypermail/linux/kernel/0302.1/0574.html

Why is there the check "if (cpu_model > 3) return 0?

Regards, Vasili