Handling module parameters

Similar to a user program, a kernel module can accept arguments from the command line. This allows us to dynamically change the behavior of the module according to the given parameters, which can help a developer not have to indefinitely change/compile the module during a test/debug session. In order to set this up, we should first declare the variables that will hold the values of command-line arguments and use the module_param() macro on each of these. The macro is defined in include/linux/moduleparam.h (this should be included in the code too – #include <linux/moduleparam.h>) as follows:

module_param(name, type, perm);

This macro contains the following elements:

• name: The name of the variable used as the parameter.
• type: The parameter's type (bool, charp, byte, short, ushort, int, uint, long, and ulong), where charp stands for character pointer.
• perm: This represents the /sys/module/<module>/parameters/&lt...