Red Hat Bugzilla – Bug 413941
powernow-k8 requires SMP to build
Last modified: 2008-05-21 11:03:15 EDT
Description of problem:
Build of kernel module powernow-k8.o unconditionally relies on conditional
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. rpm -ivh kernel-2.6.18-53.1.4.el5.src.rpm
2. rpmbuild -bp --target i686 SPEC/kernel.spec
3. Using kernel's menuconfig, disable SMP support, save new config
4. Attempt to rebuild kernel
arch/i386/kernel/cpu/cpufreq/powernow-k8.c: In function âpowernowk8_initâ:
arch/i386/kernel/cpu/cpufreq/powernow-k8.c:1435: error: âstruct cpuinfo_x86â has
no member named âbooted_coresâ
make: *** [arch/i386/kernel/cpu/cpufreq/powernow-k8.o] Error 1
make: *** [arch/i386/kernel/cpu/cpufreq] Error 2
make: *** [arch/i386/kernel/cpu] Error 2
That structure member "booted_cores" is #ifdef'd to CONFIG_SMP in file
I am well aware that Red Hat does not support user-modified kernels. That said,
I think you might want to know that you've painted yourselves into a corner
should you ever decide to do a non-SMP kernel again.
(In reply to comment #1)
> I am well aware that Red Hat does not support user-modified kernels. That said,
> I think you might want to know that you've painted yourselves into a corner
> should you ever decide to do a non-SMP kernel again.
You're 100% right in that we do not support user-modified kernels. It is *very*
unlikely that we'll ever go back to shipping a UP kernel (see Fedora). OTOH,
you do point out a valid bug in our code that, IMO, is easy to fix. I'll point
it out to the appropriate people.
Created attachment 281231 [details]
RHEL5 fix for this issue
Steve, the attached patch should get you moving again and get you a clean
compile of the PowerNow driver.
(In reply to comment #5)
> Steve, the attached patch should get you moving again and get you a clean
> compile of the PowerNow driver.
Thanks for the quick turn-around, Prarit.
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
You can download this test kernel from http://people.redhat.com/dzickus/el5
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.