Build

The module building system.

Full method: get the kernel, build it to a directory $KDIR, and then run:

make -C "$KDIR" M="$(PWD)" modules

Quick method: no need for a full build, just:

make modules_prepare

but you lose some functionality. TODO: module insert on host then fails with:

insmod: ERROR: could not insert module hello.ko: Invalid module format

even though kernel tree was checked out to match the host.

Using your distro's kernel version:

/lib/modules/$(uname -r)/build

includes

Header files come from the same directory as the makefile: /lib/modules/$(uname -r)/build.

TODO how is that different from: /usr/src/linux-headers-$(uname -r)/ ?

Those come directly from the kernel source tree.