recode code compilation error

[linux-gcc]

ERROR: modpost: "__SCT__apic_call_write" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
ERROR: modpost: "query_tracker" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
ERROR: modpost: "__SCK__apic_call_write" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
ERROR: modpost: "tracker_del" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
ERROR: modpost: "__SCT__apic_call_read" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
ERROR: modpost: "switch_hook_set_state_enable" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
ERROR: modpost: "__SCK__apic_call_eoi" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
ERROR: modpost: "__SCK__apic_call_read" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
ERROR: modpost: "__SCT__apic_call_eoi" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
ERROR: modpost: "set_hook_callback" [/home/gc/apt/side-channel/linux-detection-master/recode/driver/recode.ko] undefined!
WARNING: modpost: suppressed 1 unresolved symbol warnings because there were too many)

Are there only missing implementations of functions like query_tracker in the recode code?

@alessandropellegrini