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

[Christoph Lameter]

On Tue, 20 Nov 2007, 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.

Right that is important for the percpu references that can be folded by 
the linker in order to avoid address calculations.

> Hmm, in theory since it is not actually used by itself I suppose you could 
> move it into positive space.

But the positive space is reserved for a processes memory.

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