Importing system call as a module function

This is to discuss the problems I am facing with a driver built on a 2.6.18 kernel. In the driver code, a system call has been imported as a module function. Can this be done? The module is building all right without any error. I am providing the link to the source code repository for the same to understand this problem. Here is the function definition in the module code- https://github.com/HeisSpiter/hepunion/blob/096b2950aaf0626abf51098195b89bde... This function long mkdir(......) has most probably imported sytem call sys_mkdir since no other instance of mkdir is there in the kernel source tree. http://lxr.linux.no/linux+v2.6.18/include/linux/syscalls.h#L389 Please somebody explain this. Regards, Saket Sinha