Comment 18 for bug 1866293

Reviewed: https://review.opendev.org/713936
Committed: https://git.openstack.org/cgit/starlingx/integ/commit/?id=ef150416f5ccb18707d75df1f1f8b2a36156b5b4
Submitter: Zuul
Branch: r/stx.3.0

commit ef150416f5ccb18707d75df1f1f8b2a36156b5b4
Author: Jim Somerville <email address hidden>
Date: Mon Mar 16 16:16:20 2020 -0400

    Build mpt2sas and mpt3sas drivers as modules

    History:
    Back in the day, we didn't have an initramfs
    to allow us to load disk drivers as modules. All
    disk drivers had to be built-in. In CentOS 7.3,
    the mpt2sas and mpt3sas driver code was reorganized
    to allow for a common code base. But along with that,
    those drivers would only now build as modules. We
    created a patch which involved taking a snapshot of
    mpt driver code, and massaged it all into building
    as built-in drivers.

    Problem:
    That old code snapshot along with the fact
    that those two drivers initialize without their
    associated hardware being present (they are built-in),
    seems to cause interference with some other LSI raid
    controllers, namely Harpoon in AVAGO MR9460-8i via a
    Huawei enclosure.

    Solution:
    Simply revert to building those two mptsas drivers as
    modules, the way CentOS intended. They will reside
    on initramfs and be loaded automatically if the
    appropriate hardware is present. With these drivers now
    out of the way, the problematic raid controller works
    fine, driven by the megaraid_sas driver.

    Change-Id: I054c2396df4e659c324e70bffcf3940ad93c9354
    Closes-Bug: 1866293
    Signed-off-by: Jim Somerville <email address hidden>
    (cherry picked from commit 1435fe178ab88aa2b77970a3c07e8a907477a654)
    Conflicts:
     kernel/kernel-rt/centos/build_srpm.data
     kernel/kernel-std/centos/build_srpm.data