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Re: 64-bit SMP hangs in __cpu_up().

To: Kaz Kylheku <>
Subject: Re: 64-bit SMP hangs in __cpu_up().
From: Ralf Baechle <>
Date: Fri, 8 Sep 2006 12:59:53 +0200
In-reply-to: <66910A579C9312469A7DF9ADB54A8B7D390152@exchange.ZeugmaSystems.local>
Original-recipient: rfc822;
References: <66910A579C9312469A7DF9ADB54A8B7D390152@exchange.ZeugmaSystems.local>
User-agent: Mutt/
On Thu, Sep 07, 2006 at 04:25:51PM -0700, Kaz Kylheku wrote:

> Anyone seen anything like this?
> Execution does not get past the loop:
>   while (!cpu_isset(cpu, cpu_callin_map))
>     udelay(100);
> The other CPU is not coming up.
> 32 bit SMP works fine.

Interesting because the 64-bit kernel is considered bettere tested on
Sibyte chips than 32-bit these days.

Not a problem I was aware of.


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