How do I build my server's kernels

With the recent Meltdown and Spectre critical vulnerabilities, I had to recompile my server's kernel quote often, so I established the following routine:

1. Download incremental patches:

for pn in `seq 115 118`; do
  wget "https://cdn.kernel.org/pub/linux/kernel/v4.x/incr/patch-4.4.${pn}-$((pn+1)).xz"
done

2. Unpack incremental patches:
   
for pn in `seq 115 118`; do
  xz -d patch-4.4.${pn}-$((pn+1)).xz
done

3. Apply incremental patches:
   
for pn in `seq 115 118`; do
  patch -p1 < patch-4.4.${pn}-$((pn+1))
done

4. Update configuration:

make oldconfig

5. Build:
   
time nice -+19 make

All this (except 4) could be automated in a bash script, but I'm feeling lazy, so I wrote it down here for my personal reference.