linux-kernel-module-cheat/kernel_module/make-host.sh

#!/usr/bin/env bash

# We can almost do everything from the Makefile itself by using default values for
#
#    LINUX_DIR ?= "/lib/modules/$(uname -r)/build"
#    BR2_EXTERNAL_KERNEL_MODULE_PATH="$(pwd)"
#
# The problem with that is that if you define those variables in your environment,
# the build breaks, so this is more portable.
#
# Trying to add `-i` to overcome incompatible modules will fail,
# because any build failure prevents the generation of all `.mod.c` files.

j="$(($(nproc) - 2))"
while getopts j: OPT; do
  case "$OPT" in
    'j')
      j="$OPTARG"
    ;;
  esac
done
shift $(($OPTIND - 1))
make -j "$j" KERNEL_MODULE_PATH="$(pwd)" LINUX_DIR="/lib/modules/$(uname -r)/build" "$@"
make -C user/ -j "$j" "$@"