Building a Kernel Patch

Download URLs

URLs of the kernel source RPM package (for example, kernel-3.10.0-957.el7.src.rpm):

The version of the RPM package of the kernel source code must be the same as the kernel version of the OS.

Official Red Hat website: https://access.redhat.com/downloads/

CentOS website: https://vault.centos.org/7.6.1810/os/Source/SPackages/

Procedure

1. Install and decompress the source package.
   1. Run the following command to install the source package:

      rpm -ivh kernel-3.10.0-957.el7.src.rpm

   2. Run the following command to go to the /root/rpmbuild/SOURCES directory:

      cd /root/rpmbuild/SOURCES/

   3. Run the following commands to decompress the source package:

      xz -d linux-3.10.0-957.el7.tar.xz

      tar xvf linux-3.10.0-957.el7.tar

2. Modify kernel code.
   1. Run the following command to go to the /root/rpmbuild/SOURCES/linux-3.10.0-957.el7 directory:

      cd /root/rpmbuild/SOURCES/linux-3.10.0-957.el7

   2. Run the vi command to modify functions in the drivers/firmware/dmi_scan.c and include/linux/dmi.h files. Modify the following content. For details, see https://lore.kernel.org/lkml/1448575344-19107-1-git-send-email-jordan_hargrave@dell.com/#Z30drivers:firmware:dmi_scan.c.

      The plus sign (+) in front of a code line indicates that the line is newly added, and the minus sign (-) in front of a code line indicates that the line is deleted.

3. Compress the kernel code.
   1. Run the following command to go to the directory where the linux-3.10.0-957.el7 folder is stored:

      cd /root/rpmbuild/SOURCES

   2. Run the following commands to compress the source file:

      tar -cf linux-3.10.0-957.el7.tar linux-3.10.0-957.el7

      xz -z linux-3.10.0-957.el7.tar

   3. Delete the source folder.

      rm -rf linux-3.10.0-957.el7

4. Build the source package.
   1. Run the following command to go to the /root/rpmbuild/SPECS/ directory:

      cd ../SPECS/

   2. Run the following command to build the source package:

      rpmbuild -ba kernel.spec

      The generated RPM package is stored in the /root/rpmbuild/RPMS/x86_64 directory.

5. Uninstall the original kernel RPM package from the OS and install the newly generated kernel RPM package.
   1. Run the following command to query the original kernel RPM package on the OS:

      rpm -qa |grep kernel

      See the following figure:

   2. Run the following command to uninstall the original kernel RPM package on the OS:

      rpm -e File_name

      See the following figure:

      Retain the brt-addon-kerneloops-2.1.11-60.el7.centos.x86_64 file.

   3. Run the following commands to install the RPM packages compiled in 4, including kernel, kernel-devel, kernel-headers, kernel-tools-libs and kernel-tools.

      rpm -Uvh kernel-3.10.0-957.el7.x86_64.rpm

      rpm -Uvh kernel-devel-3.10.0-957.el7.x86_64.rpm

      rpm -Uvh kernel-headers-3.10.0-957.el7.x86_64.rpm

      rpm -Uvh kernel-tools-libs-3.10.0-957.el7.x86_64.rpm

      rpm -Uvh kernel-tools-3.10.0-957.el7.x86_64.rpm

      See the following figure:

Troubleshooting

If an error is reported when the rpmbuild command is run, add the required dependencies.

Error message:

error: Failed build dependencies:
        xmlto is needed by kernel-3.10.0-957.el7.x86_64
        asciidoc is needed by kernel-3.10.0-957.el7.x86_64
        hmaccalc is needed by kernel-3.10.0-957.el7.x86_64
        pesign >= 0.109-4 is needed by kernel-3.10.0-957.el7.x86_64
        elfutils-devel is needed by kernel-3.10.0-957.el7.x86_64
        zlib-devel is needed by kernel-3.10.0-957.el7.x86_64
        binutils-devel is needed by kernel-3.10.0-957.el7.x86_64
        newt-devel is needed by kernel-3.10.0-957.el7.x86_64
        python-devel is needed by kernel-3.10.0-957.el7.x86_64
        perl(ExtUtils::Embed) is needed by kernel-3.10.0-957.el7.x86_64
        audit-libs-devel is needed by kernel-3.10.0-957.el7.x86_64
        numactl-devel is needed by kernel-3.10.0-957.el7.x86_64
        pciutils-devel is needed by kernel-3.10.0-957.el7.x86_64

Build the following dependencies:

rpm -ivh zlib-devel-1.2.7-13.el7.x86_64.rpm 
rpm -ivh boost-regex-1.53.0-18.el7.x86_64.rpm
rpm -ivh source-highlight-3.1.6-6.el7.x86_64.rpm
rpm -ivh asciidoc-8.6.8-5.el7.noarch.rpm
rpm -ivh hmaccalc-0.9.13-4.el7.x86_64.rpm
rpm -ivh opensc-0.13.0-9.el7.x86_64.rpm
rpm -ivh pesign-0.109-6.el7.x86_64.rpm 
rpm -ivh elfutils-libelf-devel-0.158-3.el7.x86_64.rpm 
rpm -ivh elfutils-devel-0.158-3.el7.x86_64.rpm
rpm -ivh binutils-devel-2.23.52.0.1-16.el7.x86_64.rpm
rpm -ivh newt-0.52.15-4.el7.x86_64.rpm
rpm -ivh slang-devel-2.2.4-11.el7.x86_64.rpm 
rpm -ivh newt-devel-0.52.15-4.el7.x86_64.rpm 
rpm -ivh python-devel-2.7.5-16.el7.x86_64.rpm
rpm -ivh perl-ExtUtils-Embed-1.30-283.el7.noarch.rpm
rpm -ivh audit-libs-devel-2.3.3-4.el7.x86_64.rpm
rpm -ivh numactl-devel-2.0.9-2.el7.x86_64.rpm
rpm -ivh pciutils-3.2.1-4.el7.x86_64.rpm
rpm -ivh pciutils-devel-3.2.1-4.el7.x86_64.rpm
rpm -ivh xmlto-0.0.25-7.el7.x86_64.rpm –nodeps