Summary

In this chapter, the second one on writing kernel modules via 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 (first – the typically preferred one, which is the linking approach, and second, the module-stacking approach), using module parameters, avoiding floating-point arithmetic, the auto-loading of your kernel modules at boot, and so on. Security concerns, especially regarding modules and how they can be addressed, are important and have been covered. Finally, we wrapped up this chapter by covering kernel coding style guidelines, and how you can get...