CONFIG_IKHEADERS has a reproducibility issue because the contents of
kernel/kheaders_data.tar.xz can vary depending on how you build the
kernel.
If you build the kernel with CONFIG_IKHEADERS enabled from a pristine
state, the tarball does not include include/generated/utsversion.h.
$ make -s mrproper
$ make -s defconfig
$ scripts/config -e CONFIG_IKHEADERS
$ make -s
$ tar Jtf kernel/kheaders_data.tar.xz | grep utsversion
However, if you build the kernel with CONFIG_IKHEADERS disabled first
and then enable it later, the tarball does include
include/generated/utsversion.h.
$ make -s mrproper
$ make -s defconfig
$ make -s
$ scripts/config -e CONFIG_IKHEADERS
$ make -s
$ tar Jtf kernel/kheaders_data.tar.xz | grep utsversion
./include/generated/utsversion.h
It is not predictable whether a stale include/generated/utsversion.h
remains when kheaders_data.tar.xz is generated.
For better reproducibility, include/generated/utsversions.h should
always be omitted. It is not necessary for the kheaders anyway.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
41e86fe7eb