Message-ID: <46FEB9CA.9090703@tmr.com>
Date: Sat, 29 Sep 2007 16:47:06 -0400
From: Bill Davidsen <davidsen@tmr.com>
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To: Alexey Starikovskiy <astarikovskiy@suse.de>
CC: Mark Lord <lkml@rtr.ca>, "H. Peter Anvin" <hpa@zytor.com>,
       linux-kernel@vger.kernel.org
Subject: Re: regression in 2.6.23-rc8 - power off failed
References: <20070929005453.GA4475@erig.dyndns.org> <46FDC0EB.3070003@zytor.com> <20070929082233.GA3447@erig.dyndns.org> <46FE0D29.4090706@zytor.com> <20070929093553.GA4451@erig.dyndns.org> <46FE47C7.6070901@rtr.ca> <46FE6E17.6070109@suse.de>
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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@tmr.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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