• Laura Abbott's avatar
    kbuild: Add build salt to the kernel and modules · 9afb719e
    Laura Abbott authored
    In Fedora, the debug information is packaged separately (foo-debuginfo) and
    can be installed separately. There's been a long standing issue where only
    one version of a debuginfo info package can be installed at a time. There's
    been an effort for Fedora for parallel debuginfo to rectify this problem.
    Part of the requirement to allow parallel debuginfo to work is that build ids
    are unique between builds. The existing upstream rpm implementation ensures
    this by re-calculating the build-id using the version and release as a
    seed. This doesn't work 100% for the kernel because of the vDSO which is
    its own binary and doesn't get updated when embedded.
    Fix this by adding some data in an ELF note for both the kernel and modules.
    The data is controlled via a Kconfig option so distributions can set it
    to an appropriate value to ensure uniqueness between builds.
    Suggested-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
    Signed-off-by: default avatarLaura Abbott <labbott@redhat.com>
    Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>