From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Andreas Schwab <schwab@suse.de>
Cc: Giuliano Pochini <pochini@denise.shiny.it>,
linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org,
spyro@f2s.com, rmk@arm.linux.org.uk
Subject: Re: /sys/devices/system/cpu/cpuX/online are missing
Date: Tue, 13 Mar 2007 10:03:50 +0100 [thread overview]
Message-ID: <20070313090350.GA9890@osiris.boeblingen.de.ibm.com> (raw)
In-Reply-To: <je6496asea.fsf@sykes.suse.de>
On Tue, Mar 13, 2007 at 01:39:25AM +0100, Andreas Schwab wrote:
> Giuliano Pochini <pochini@denise.shiny.it> writes:
>
> > I had a look at arch/powerpc/kernel/smp.c but I'm not familiar at all with
> > those parts of the kernel.
>
> See arch/powerpc/kernel/sysfs.c:topology_init. I don't think there is
> anything to do here. You probably don't have CONFIG_HOTPLUG_CPU enabled.
I was referring to arch/ppc not arch/powerpc. But it seems that arch/ppc
doesn't support cpu hotplug anyway. So I guess it's indeed just a missing
config option.
Grepping a bit further shows that arm suffered by the change that inverted
the logic if the 'online' attribute for cpus should appear. Since arm
supports cpu hotplug but the patch left arm out, it doesn't work there
anymore (cc'ing arm people: changeset 72486f1f8f0a2bc828b9d30cf4690cf2dd6807fc
is most probably disabling cpu hotplug support on arm like it did on s390).
next prev parent reply other threads:[~2007-03-13 9:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-11 21:26 /sys/devices/system/cpu/cpuX/online are missing Giuliano Pochini
2007-03-11 21:42 ` Lee Revell
2007-03-12 8:58 ` Heiko Carstens
2007-03-12 22:48 ` Giuliano Pochini
2007-03-13 0:39 ` Andreas Schwab
2007-03-13 9:03 ` Heiko Carstens [this message]
2007-03-13 9:11 ` Heiko Carstens
2007-03-13 9:40 ` Russell King
2007-03-13 9:56 ` Russell King
2007-03-14 23:30 ` Giuliano Pochini
2007-03-13 9:44 ` Andreas Schwab
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070313090350.GA9890@osiris.boeblingen.de.ibm.com \
--to=heiko.carstens@de.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@ozlabs.org \
--cc=pochini@denise.shiny.it \
--cc=rmk@arm.linux.org.uk \
--cc=schwab@suse.de \
--cc=spyro@f2s.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).