Adding a new System call to Linux 3.2.x as a loadable kernel module

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http://unix.stackexchange.com – I want to add a particular new system call in the linux kernel 3.2.x but as a loadable kernel module.(as i don't want to recompile the kernel again and again) I read through many posts on internet and also on SO, and got an impression that implementing System calls as a loadable module is not possible and some places it is said to be possible. I am really confused now. Can somebody please point me to a right direction if it is possible or an explanation if it is not.. many thanks (HowTos)