linux-kernel - Re: /sys/devices/system/cpu/cpuX/online are missing

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Message-ID: <20070312085826.GA9985@osiris.boeblingen.de.ibm.com>
Date:	Mon, 12 Mar 2007 09:58:26 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Giuliano Pochini <pochini@...ny.it>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: /sys/devices/system/cpu/cpuX/online are missing

On Sun, Mar 11, 2007 at 10:26:52PM +0100, Giuliano Pochini wrote:
> 
> 
> Since 2.6.20 /sys/devices/system/cpu/cpuX/online isn't there anymore. The
> directories exist, though. I also tested linux-2.6.21rc3. I had a look at the
> archives and I found nothing about the removal of that file, which is still
> documented in Documentation/cpu-hotplug.txt. I don't know if other
> architectures are affected.
> 
> $ uname -a
> Linux Jay 2.6.20 #1 SMP Mon Feb 5 22:42:18 CET 2007 ppc 7455, altivec supported PowerMac3,6 GNU/Linux
> 
> No cpusets. CONFIG_HOTPLUG_CPU=y

Somebody inverted the logic when and if the 'online' attribute for cpu devices
appear. See 72486f1f8f0a2bc828b9d30cf4690cf2dd6807fc.
The fix for s390 is this: 6721f77810dfcb7cbf8e97be6fa43fe2740dd0aa.
Looks like arch/ppc was left out as well.
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