On Tue, Mar 29, 2016 at 2:27 AM, Patrick Begou < Patrick.Begou@legi.grenoble-inp.fr> wrote:
Akemi Yagi wrote:
I recommend you follows the instructions in this CentOS wiki article:
https://wiki.centos.org/HowTos/Custom_Kernel
If you encounter any issue, please let us know here.
Akemi
Thanks for answering Akemi . Indeed I tried using this howto before
posting but something is wrong in this tutorial.
I installed the prerequisites and downloaded the kernel sources as detailed in section 2 of https://wiki.centos.org/HowTos/I_need_the_Kernel_Source.
But on https://wiki.centos.org/HowTos/Custom_Kernel, section 2, all goes wrong! My ~/rpmbuild/BUILD directory is empty! No configs directory too. No ~/rpmbuild/BUILD/kernel-*/linux-*/ available, all configs files are in ~/rpmbuild/SOURCES
The referenced wiki article should work for building CentOS-6 kernels (not quite ready for CentOS-7). You really have to dot the i's and cross the t's. If you miss a step or command in there, chances are it will fail.
Since this I try to modify ~/rpmbuild/SOURCES/config-x86-generic because it was the only file containing the CONFIG_ACPI_NUMA flag. No success, the build does not take account of my changes as the ~/rpmbuild/BUILD/kernel-2.6.32-573.22.1.el6/linux-2.6.32-573.22.1.el6.numa.x86_64/.config created file with: rpmbuild -bb --without xen --without debug --without debuginfo --target=x86_64 ./SPECS/kernel.spec says "# CONFIG_NUMA_EMU is not set"
So I change this file with an editor and rebuild the rpm package of the kernel with the same command. The .config file is overwriten.
As you found out, editing the existing config-x86-generic file would not work because the final config file is created on the fly. This is why the wiki instructions tell you to create your customized config file and show you how to get that config file to be used during the build process.
I have another suggestion for you. Get the srpm for the CentOSPlus kernel instead of the distro kernel. The plus kernel is a customized kernel. It has kernel-xx-config files that you can directly edit. They will not be overwritten. Perhaps this method is easier.
But if you wish to go for the original method, just be extremely precise not to skip any step.
Hope this helps,
Akemi