dtrace probe not listed

I do not see the function ifhwioctl listed when I run dtrace -l. This function is located in /usr/src/sys/net/if.c.
I thought maybe this was optimized out, so I set the following in my /etc/make.conf
Code:
CFLAGS= -O0 -fno-inline
But it is still not listed.

What may be causing this lack of probe?
 
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