> 4) TAB vs SPACE indentation !

Doh! Could you remind me - what was the magic tool which takes care of indentation
for kernel devs? Osmocom uses linux kernel code style, is it?

indent? But it has A LOT of options. Osmocom uses linux kernel coding style, right?

man indent

[...]

The Linux style is used in the linux kernel code and drivers. Code generally has to follow the Linux coding style to be accepted.

This style is equivalent to the following settings:

-nbad -bap -nbc -bbo -hnl -br -brs -c33 -cd33 -ncdb -ce -ci4

-cli0 -d0 -di1 -nfc1 -i8 -ip0 -l80 -lp -npcs -nprs -npsl -sai

-saf -saw -ncs -nsc -sob -nfca -cp33 -ss -ts8 -il1

[...]

Does this command matches exactly osmocom coding style (can't try it myself now...)?