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After running make command, there will be two modules:
The fist module is basic helloworld driver, the second one is the same, but accepts some parameters, and print these in the kernel debug messages. After loading the first module, two entries will be added in kernel debug message:
# insmod ./helloworld.ko
#dmesg
[...]
[38535.487568] Hello world!
[38542.391099] End of the world
For the second module, one loads it with:
# insmod ./helloworld-params.ko
If no parameters are provided, the defaults will be used:
$ dmesg
[...]
[37858.595126] Hello world with parameters!
[37858.595129] The *mystr* parameter: hello
[37858.595130] The *myint* parameter: 1
[37858.595131] The *myarr* parameter: 0, 1, 2
[37887.232643] End of the world
When parameters are provided, the will be printed
# insmod ./helloworld-params.ko mystr="packtpub" myint=255 myarr=23,4,7
# dmesg
[...]
[37892.417968] Hello world with parameters!
[37892.417970] The *mystr* parameter: packtpub
[37892.417971] The *myint* parameter: 255
[37892.417972] The *myarr* parameter: 23, 4, 7
[37895.222808] End of the world
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