ftrace_get_addr_curr
addr = ftrace_get_addr_curr(rec);
old = ftrace_call_replace(rec->ip, ftrace_get_addr_curr(rec));
unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec);
ip = ftrace_get_addr_curr(rec);
ftrace_old_addr = ftrace_get_addr_curr(rec);