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Embedded Linux Projects Using Yocto Project Cookbook by Alex González

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Debugging the Linux kernel and modules

We will highlight some of the most common methods employed by kernel developers to debug kernel issues.

How to do it...

Above all, debugging the Linux kernel remains a manual process, and the most important developer tool is the ability to print debug messages.

The kernel uses the printk function, which is very similar syntactically to the printf function call from standard C libraries, with the addition of an optional log level. The allowed formats are documented in the kernel source under Documentation/printk-formats.txt.

The printk functionality needs to be compiled into the kernel with the CONFIG_PRINTK configuration variable. You can also configure the Linux kernel to prepend a precise timestamp to every ...

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