Re: More than 8 CPUs detected and CONFIG_X86_PC cannot handle it on 2.6.16-rc6

[Ashok Raj]

On Tue, Mar 14, 2006 at 11:31:38PM -0800, Andrew Morton wrote:
> >  > see:
> >  > 
> >  > Subject: i386 cpu hotplug bug - instant reboot when onlining secondary
> >  > 
> >  > http://lkml.org/lkml/2006/2/19/186
> >  Works for me. But I saw a warning.
> 
> Guys, will you please stop being so cryptic?  What worked for you?  What
> warning?  wtf is going on?  Who owns this problem, whatever it is?

Nathan's problem is different, its nothing related to this thread.

Appears that a PIII box had trouble to bring a CPU back online after it was
just offlined. Iam not able to reproduce it with the systems i have here.
I have tried a PIII box itself, and also a x86_64 system booting a i386 kernel
and all seems to work ok.

Zwane was attempting to trace Nathan's issue with some experimental patches
but dont think it went far along yet.


> >  -		gdt = (struct desc_struct *)get_zeroed_page(GFP_KERNEL);
> >  +		gdt = (struct desc_struct *)get_zeroed_page(GFP_ATOMIC);
> 

It might help to post with the actual warning, so we can understand why this
fix is necessary.

-- 
Cheers,
Ashok Raj
- Open Source Technology Center
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