/home/seth/linuxkernel/Linux_Device_Drivers/DataStructures/LinkedList.c:10:5: error: function declaration isn’t a prototype [-Werror=strict-prototypes]
 int main()
     ^
/home/seth/linuxkernel/Linux_Device_Drivers/DataStructures/LinkedList.c: In function ‘main’:
/home/seth/linuxkernel/Linux_Device_Drivers/DataStructures/LinkedList.c:14:15: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
  root -> data = 20;
               ^
/home/seth/linuxkernel/Linux_Device_Drivers/DataStructures/LinkedList.c:18:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
cc1: some warnings being treated as errors
scripts/Makefile.build:264: recipe for target '/home/seth/linuxkernel/Linux_Device_Drivers/DataStructures/LinkedList.o' failed
make[2]: *** [/home/seth/linuxkernel/Linux_Device_Drivers/DataStructures/LinkedList.o] Error 1
Makefile:1423: recipe for target '_module_/home/seth/linuxkernel/Linux_Device_Drivers/DataStructures' failed
make[1]: *** [_module_/home/seth/linuxkernel/Linux_Device_Drivers/DataStructures] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.4.0-112-generic'
Makefile:4: recipe for target 'all' failed
make: *** [all] Error 2