Dear Akemi,
I'm really ashamed, in "https://wiki.centos.org/HowTos/I_need_the_Kernel_Source";
I've missed the last 5 lines following the CentOS5 section. All is now clear for
me on the process to follow to build a new kernel from source rpm and the
CONFIG_NUMA_EMU option is active.
I've set it with make menuconfig to avoid some additional mistakes in the config
file.
However, with this CONFIG_NUMA_EMU option , the compiler returns an error and
compilation fails.
arch/x86/mm/srat_64.c: In function 'acpi_fake_nodes':
arch/x86/mm/srat_64.c:469: error: implicit declaration of function
'__acpi_map_pxm_to_node'
make[2]: *** [arch/x86/mm/srat_64.o] Error 1
make[1]: *** [arch/x86/mm] Error 2
make: *** [arch/x86] Error 2
make: *** Waiting for unfinished jobs....
error: Bad exit status from /var/tmp/rpm-tmp.VkJ805 (%build)
Bad exit status from /var/tmp/rpm-tmp.VkJ805 (%build)
Without CONFIG_NUMA_EMU option, compilation is successfull.
It is the CentOSplus kernel from kernel-2.6.32-573.el6.centos.plus.src.rpm as
yous suggested.
Thank for your patience
Patrick
Akemi Yagi wrote:
On Tue, Mar 29, 2016 at 2:27 AM, Patrick Begou <
Patrick.Begou@xxxxxxxxxxxxxxxxxxxx> 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
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