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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