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SubjectRe: cpu hotplug: possible_cpus broken (again?) next-20130607
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On Wed, 2013-06-12 at 00:34 +0200, Rafael J. Wysocki wrote:
> On Tuesday, June 11, 2013 03:17:28 PM Dave Hansen wrote:
> > On 06/11/2013 03:05 PM, Rafael J. Wysocki wrote:
> > > On Tuesday, June 11, 2013 02:51:33 PM Dave Hansen wrote:
> > >> possible_cpus looks broken again. I'm booting with:
> > >>
> > >> maxcpus=10 possible_cpus=160
> > >>
> > >> But I only get 0-9 in sysfs:
> > >>
> > >>> # ls /sys/devices/system/cpu/
> > >>> cpu0 cpu2 cpu4 cpu6 cpu8 cpufreq kernel_max offline possible probe uevent
> > >>> cpu1 cpu3 cpu5 cpu7 cpu9 cpuidle modalias online present release
> > >
> > > Can you please test the acpi-hotplug branch of the linux-pm.git tree?
> >
> > That branch seems to work happily.
>
> In that case the problem may have been reintroduced by a merge conflict fix in
> linux-next.

I believe the problem was introduced by the following change. From the
description, though, this is exactly what this patch was trying to
change... Adding Youguan to the list.

commit 3e275a5ba367ab74b3a4e49114307baed989fcac
Author: Youquan Song <youquan.song@intel.com>
Date: Fri Jun 7 10:07:08 2013 +1000

drivers/base/cpu.c: fix maxcpus boot option


Thanks,
-Toshi






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