11.2. Using the Kernel Build System
Lkmpg contains fine instructions for building (compiling) an LKM (except that the __KERNEL__ macro and usually the MODULE macro should be defined in the source code instead of with -D compiler options as Lkmpg suggests). But it deserves mention that some Linux kernel programmers believe that the only right way to build an LKM is to add it to a copy of the complete Linux source tree and build it with the existing Linux make files just like the LKMs that are part of Linux.
There are advantages to this. The biggest one is that when Linux programmers change the way LKMs interface with the rest of the kernel in a way that affects how you build an LKM, you're covered.
On the other hand, you will probably find from a code management point of view that you really have to keep your own code and Linux separate, and from a coding point of view, you really need to understand all the intricacies of how your code gets compiled, especially when it changes.
* License
