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Applying Lustre Patches into the Kernel

Preparing the Kernel Source Code

  1. Create a directory structure.
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    $ cd $HOME
$ mkdir -p kernel/rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS}
$ cd kernel
$ echo '%_topdir %(echo $HOME)/kernel/rpmbuild' > ~/.rpmmacros
  2. Install the kernel source code.
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    $ rpm -ivh https://vault.centos.org/8.0.1905/BaseOS/Source/SPackages/kernel-4.18.0-80.11.2.el8_0.src.rpm
  3. Run the rpmbuild command to prepare the kernel source code.
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    $ cd ~/kernel/rpmbuild
$ rpmbuild -bp --target=`uname -m` ./SPECS/kernel.spec

    The command output is as follows:

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    ...
Processed config files are in /home/build/kernel/rpmbuild/BUILD/kernel-4.18.0-80.11.2.el8_0/linux-4.18.0-80.11.2.el8.aarch64/configs
+ cd ..
+ find . '(' -name '*.orig' -o -name '*~' ')' -exec rm -f '{}' ';'
+ find . -name .gitignore -exec rm -f '{}' ';'
+ cd ..
+ exit 0
  4. Copy the kernel file to the Lustre tree.
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    cp ~/kernel/rpmbuild/BUILD/kernel-4.18.0-80.11.2.el8_0/linux-4.18.0-80.11.2.el8.aarch64/configs/kernel-4.18.0-aarch64.config ~/lustre-release/lustre/kernel_patches/kernel_configs/kernel-4.18.0-4.18-rhel8-aarch64.config
  5. Edit the kernel file.
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    vim ~/lustre-release/lustre/kernel_patches/kernel_configs/kernel-4.18.0-4.18-rhel8-aarch64.config

    Find "# IO Schedulers" and insert the following content below it:

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    CONFIG_IOSCHED_DEADLINE=y
CONFIG_DEFAULT_IOSCHED="deadline"

Applying Lustre Patches

  1. Integrate all patches into one file.
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    $ cd ~
$ rm -f ~/lustre-kernel-aarch64-lustre.patch  #Note: This command is unnecessary if this patch does not exist.
$ cd ~/lustre-release/lustre/kernel_patches/series
$ for patch in $(<"4.18-rhel8.series"); do \
patch_file="$HOME/lustre-release/lustre/kernel_patches/patches/${patch}"; \
cat "${patch_file}" >> "$HOME/lustre-kernel-aarch64-lustre.patch"; \
done
  2. Copy the kernel patch build tree.
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    cp ~/lustre-kernel-aarch64-lustre.patch ~/kernel/rpmbuild/SOURCES/patch-4.18.0-lustre.patch
  3. Edit the ~/kernel/rpmbuild/SPECS/kernel.spec file.
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    vim ~/kernel/rpmbuild/SPECS/kernel.spec
    1. Find "find $RPM_BUILD_ROOT/lib/modules/$KernelVer" and insert the following content below it:
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      cp -a fs/ext4/* $RPM_BUILD_ROOT/lib/modules/$KernelVer/build/fs/ext4
    2. Find "# empty final patch to facilitate testing of kernel patches" and insert the following content below it:
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      # adds Lustre patches
Patch99995: patch-%{version}-lustre.patch
    3. Find "ApplyOptionalPatch linux-kernel-test.patch" and insert the following content below it:
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      # lustre patch
ApplyOptionalPatch patch-%{version}-lustre.patch
  4. Overwrite the kernel configuration file ~/lustre-release/lustre/kernel_patches/kernel_configs/kernel-4.18.0-4.18-rhel8-aarch64.config.
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    $ echo '# arm64' > ~/kernel/rpmbuild/SOURCES/kernel-4.18.0-aarch64.config
$ cat ~/lustre-release/lustre/kernel_patches/kernel_configs/kernel-4.18.0-4.18-rhel8-aarch64.config >> ~/kernel/rpmbuild/SOURCES/kernel-4.18.0-aarch64.config

Creating a Kernel RPM Package

Run the rpmbuild command to build the kernel RPM package.

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$ cd ~/kernel/rpmbuild
$ buildid="_lustre" # Note: change to any string that identify your work
$ rpmbuild -ba --with firmware --target aarch64 --with baseonly \
--without kabichk --define "buildid ${buildid}" \
~/kernel/rpmbuild/SPECS/kernel.spec

If the build is successful, the following information is displayed:

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Checking for unpackaged file(s): /usr/lib/rpm/check-files /home/build/kernel/rpmbuild/BUILDROOT/kernel-4.18.0-80.11.2.el8_lustre.aarch64
Wrote: /home/build/kernel/rpmbuild/SRPMS/kernel-4.18.0-80.11.2.el8_lustre.src.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-headers-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-cross-headers-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-debuginfo-common-aarch64-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/perf-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/perf-debuginfo-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/python3-perf-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/python3-perf-debuginfo-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-tools-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-tools-libs-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-tools-libs-devel-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-tools-debuginfo-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/bpftool-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/bpftool-debuginfo-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-core-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-devel-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-modules-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-modules-extra-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/aarch64/kernel-debuginfo-4.18.0-80.11.2.el8_lustre.aarch64.rpm
Executing(%clean): /bin/sh -e /var/tmp/rpm-tmp.SqV3vr
+ umask 022
+ cd /home/build/kernel/rpmbuild/BUILD
+ cd kernel-4.18.0-80.11.2.el8_0
+ rm -rf /home/build/kernel/rpmbuild/BUILDROOT/kernel-4.18.0-80.11.2.el8_lustre.aarch64
+ exit 0

Installing the Kernel

  1. Switch to the root user and install the kernel RPM package.
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    $ su root
# cd ~/kernel/rpmbuild/RPMS/aarch64/
# rpm -Uvh kernel-core-4.18.0-80.11.2.el8_lustre.aarch64.rpm kernel-headers-4.18.0-80.11.2.el8_lustre.aarch64.rpm kernel-modules-4.18.0-80.11.2.el8_lustre.aarch64.rpm kernel-modules-extra-4.18.0-80.11.2.el8_lustre.aarch64.rpm kernel-4.18.0-80.11.2.el8_lustre.aarch64.rpm kernel-devel-4.18.0-80.11.2.el8_lustre.aarch64.rpm kernel-tools-4.18.0-80.11.2.el8_lustre.aarch64.rpm kernel-tools-libs-4.18.0-80.11.2.el8_lustre.aarch64.rpm
  2. Reboot the system.
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    # reboot
  3. View the kernel version.
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    # uname -r

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    4.18.0-80.11.2.el8_lustre.aarch64