Comment # 2 on bug 1119895 from Jiri Slaby

Our rpm/kernel-binary.spec.in does:
  make clean $MAKE_ARGS
prior to:
  find . ! -type d ! -name 'Module.base' ! -name 'Module.*-kmp' -printf '%%P\n'
\
        > %my_builddir/obj-files

s390 does this on clean:
archclean:
        $(Q)$(MAKE) $(clean)=$(boot)
        $(Q)$(MAKE) $(clean)=$(tools)

But these two headers are generated in arch/s390/tools/:
kapi-hdrs-y := $(kapi)/facility-defs.h $(kapi)/dis-defs.h

So they are not a part of kernel-default-devel (and they should).

We should perhaps add them to this list in the spec file:
    # These files are required for building external modules
    for FILE in arch/powerpc/lib/crtsavres.o arch/arm64/kernel/ftrace-mod.o
arch/*/kernel/macros.s; do
...

We can also try pinging upstream about this, so that autogenerated headers are
not removed on make clean...

What do you think?