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Message-ID: <47434B28.4040104@zytor.com>
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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