linux-kernel - Re: FW: Linux question

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Date:	Sat, 08 Mar 2008 12:07:35 -0500
From:	Bill Davidsen <davidsen@....com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Justin Banks <justinb@...bone.com>,
	"Miller, Mike (OS Dev)" <Mike.Miller@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: FW: Linux question

Andi Kleen wrote:
> Bill Davidsen <davidsen@....com> writes:
>
>   
>> Here's an interesting question, why isn't there an "online" file for
>> each CPU?
>>     
>
> There are still some problems with off lining CPU #0 on x86 at least,
> that is why it is not allowed. iirc they weren't very difficult so it
> would be probably fixable with some effort.
>   

If that's the case I would think that making it read-only would be a 
better solution, since I found this while creating a little tool to scan 
and see what's online and what's not. Obviously there can be exception 
cases for CPU0 and x86, but I would think that having the CPU0 for x86 
be read-only would be a quirk, and handled in the kernel.

-- 
Bill Davidsen <davidsen@....com>
  "Woe unto the statesman who makes war without a reason that will still
  be valid when the war is over..." Otto von Bismark 


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