Gentoo kernel upgrade (must enable config support in kernel cfr /proc/config.gz)

upgrade_kernel.sh

#!/bin/bash -e

errr() {
  echo "$@" 1>&2
  exit 1;
}

( 
  cd linux/

  gunzip -c /proc/config.gz > .config
  make oldconfig || errr "Could not configure"
  make -j13 || errr "Could not build"

  if ! grep ' /boot ' /proc/mounts; then
    mount /boot || errr "Could not mount /boot"
  else
    echo "/boot is already mounted"
  fi;

  make install || errr "Unable to install new kernel"
  make modules_install || errr "Unable to install modules"

)

emerge @module-rebuild || errr "ERROR while compiling extra kernel modules"
genkernel initramfs || errr "Could not generate initramfs"

grub-mkconfig -o /boot/grub/grub.cfg || errr "Could not update grub config"