linux-kernel - Re: regression in 2.6.23-rc8

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Date:	Sat, 29 Sep 2007 16:47:06 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Alexey Starikovskiy <astarikovskiy@...e.de>
CC:	Mark Lord <lkml@....ca>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org
Subject: Re: regression in 2.6.23-rc8 - power off failed

Alexey Starikovskiy wrote:

> -static void
> -acpi_power_off (void)
> -{
> -       printk("%s called\n",__FUNCTION__);
> -       /* Some SMP machines only can poweroff in boot CPU */
> -       set_cpus_allowed(current, cpumask_of_cpu(0));
> ACPI in kernel 2.6.12 did disable non-boot cpus too in powe_off.
> Later only comment was left for some reason...
> 
Am I midreading that code, or does it really assume that the boot cpu is 
always zero? Or just that zero will be able to do the power off?

In any case I have had an SMP machine which did not have a CPU zero, and 
it was discussed here, I believe. Wonder what happens if you set 
affinity to a CPU you don't have...

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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