Summary

In this chapter, the second of two on writing a kernel module using the LKM framework, we covered several (remaining) areas pertaining to this important topic: among them, using a "better" Makefile for your kernel module,  tips on configuring a debug kernel (it's very important!), cross-compiling a kernel module, gathering some minimal platform information from within a kernel module, and even a bit on the licensing of kernel modules. We also looked at emulating library-like features with two different approaches (one - preferred - the linking approach, and two, the module stacking approach), using module parameters, avoiding floating-point, the auto-loading of your kernel modules, and so on. Security concerns and how they can be addressed are important. Finally, we wrapped up this chapter by covering kernel coding style guidelines, kernel documentation, and how you can get started with contributing to the mainline kernel. So, congratulations! You now...