[ovs-discuss] Failed to build Open vSwitch Kernel Modules on CentOS 7 (kernel 3.10.0-514.2.2.el7.x86_64)

[liu yulong]

Thanks Joe and Ben, actually the master branch we also got such error.
The doc we followed is "Fedora, RHEL 7.x Packaging for Open vSwitch" [1].
The conflicting shown in [2] was basically same.

[1]
https://github.com/openvswitch/ovs/blob/master/Documentation/intro/install/fedora.rst
[2] http://paste.openstack.org/show/594350/

On Thu, Jan 12, 2017 at 7:51 AM, Joe Stringer <joe at ovn.org> wrote:

> On 11 January 2017 at 15:38, Ben Pfaff <blp at ovn.org> wrote:
> > On Wed, Jan 11, 2017 at 03:03:45PM -0800, Joe Stringer wrote:
> >> On 9 January 2017 at 19:01, liu yulong <liuyulong.xa at gmail.com> wrote:
> >> > Hi experts,
> >> >
> >> > We have failed to build Open vSwitch Kernel Modules on CentOS 7
> (kernel
> >> > 3.10.0-514.2.2.el7.x86_64).
> >> >
> >> > Here are some traces we got:
> >> > http://paste.openstack.org/show/594350/
> >> >
> >> > Steps:
> >> > 1. download the current openvswitch release:
> >> > http://openvswitch.org/releases/openvswitch-2.6.1.tar.gz
> >> >
> >> > 2. rpmbuild
> >> > (1) prepare the SOURCE
> >> > cp openvswitch-2.6.1.tar.gz ~/rpmbuild/SOURCES/
> >> > tar -zxvf openvswitch-2.6.1.tar.gz
> >> > cp ./openvswitch-2.6.1/rhel/* ~/rpmbuild/SOURCES/
> >> > cp ./openvswitch-2.6.1/rhel/*.spec ~/rpmbuild/SPECS/
> >> >
> >> >
> >> > (2) edit ~/rpmbuild/SPECS/openvswitch-kmod-fedora.spec
> >> > change the #%define kernel to:
> >> > #%define kernel 3.10.0-514.2.2.el7.x86_64
> >> >
> >> > (3) start build
> >> > rpmbuild -bb --without check ~/rpmbuild/SPECS/openvswitch-
> kmod-fedora.spec
> >> >
> >> > Then we get that error. So can anyone help to solve such issue?
> >> > Thank you.
> >>
> >> If you want to use the kernel module from the OVS tree, you need to
> >> use master or wait for the next version of OVS. Alternatively you can
> >> skip using the kernel module from OVS tree and only compile the
> >> userspace programs, then use the kernel module that is provided with
> >> Centos 7.
> >
> > Maybe liu is confused because the FAQ that comes with OVS 2.6.1 says
> > that the kernel module should work with Linux 3.10.  Maybe it does not
> > work because Centos kernels diverge from upstream.
>
> True, it's a bit confusing. The FAQ distributed with 2.6 specifically
> states the supported versions, with this caveat:
>
> "The Linux kernel versions are upstream kernel versions, so Linux
> kernels modified from the upstream sources may not build in some cases
> even if they are based on a supported version. This is most notably
> true of Red Hat Enterprise Linux (RHEL) kernels, which are extensively
> modified from upstream."
>
> https://github.com/openvswitch/ovs/blob/branch-2.
> 6/FAQ.md#q-what-linux-kernel-versions-does-each-open-
> vswitch-release-work-with
>
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