linux-kernel - Re: [rfc 08/45] cpu alloc: x86 support

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Date:	Tue, 20 Nov 2007 13:01:28 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...e.de>
CC:	Christoph Lameter <clameter@....com>, akpm@...ux-foundation.org,
	travis@....com, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org
Subject: Re: [rfc 08/45] cpu alloc: x86 support

Andi Kleen wrote:
>> This limitation shouldn't apply to the percpu area, since gs_base can be 
>> pointed anywhere in the address space -- in effect we're always indirect.
> 
> The initial reference copy of the percpu area has to be addressed by
> the linker.
> 
> Hmm, in theory since it is not actually used by itself I suppose you could 
> move it into positive space.
> 

Positive space for absolute references, or just below -2 GB for %rip 
references; either should work.

	-hpa
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