calling kernel functions from within a module?

[krushnaal pai <krisonearth@xxxxxxxxx>]

i understand that for using functions like read or any other kernel function from an application we use system calls.

 

but wht about calling these functions from within the kernel module or by modifying the kernel itself,how do we do it?

 

plz answer in detail or atleast gimme links to articles/books

 

do we use export symbol to do this?