In the Distribution Kernels track at Linux Plumbers Conference there
was some discussion around the difficulty of making kernel builds
reproducible.

This is a solved problem, but the solutions don't appear to be
documented in one place. This document lists the issues I know about
and the settings needed to ensure reproducibility.

Signed-off-by: Ben Hutchings
Acked-by: Masahiro Yamada
Signed-off-by: Jonathan Corbet