On 17/02/11 16:55, Kai Schaetzl wrote:
I installed kmod-coretemp-xen-1.1-8.el5.elrepo.x86_64 on a machine with
two L5320 CPUs. Unfortunately, it can't get inserted. It throws an error
kernel: coretemp: Unknown symbol rdmsr_safe_on_cpu
Hi Kai,
I looked into this a little further and confirmed the bug.
Unfortunately, later versions of kmod-coretemp are not compatible with
xen kernels. In this instance it appears Red Hat have not backported
certain interfaces into the xen kernel variants which coretemp uses (but
have backported them to the regular (non-xen) kernel). In fact one can
see this first hand as Red Hat backported the coretemp module into
RHEL-5.5 (kernel-2.6.18-194.el5), but *only* for non-xen variants! I
wasn't aware the differences between xen and non-xen kernel variants
were so wide reaching.
With the absence of such interfaces it is becoming increasingly
difficult to continue to backport certain drivers to the xen kernel
platform, and as such we will probably just drop support for xen kernels
where that happens.
To this end I have removed kmod-coretemp-xen-1.1-8.el5.elrepo from the
repository (as it's clearly broken) and have confirmed that the latest
version to support the xen kernel is kmod-coretemp-xen-1.1-6.el5.elrepo.
If you uninstall your current version and reinstall, yum should now pull
in kmod-coretemp-xen-1.1-6.el5.elrepo that does support xen kernels. If
this version fails to support future CPU revisions then we might be able
to backport support for that but it will likely mean maintaining a
separate branch for xen kernels. As there is no native coretemp driver
in the xen kernel it's probably worthwhile, but I'd also be tempted to
file an RFE/patch upstream with Red Hat for native support in xen kernels.
I hope that helps.
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