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

Christoph Lameter
2007-11-21T00:10:55Z

On Tue, 20 Nov 2007, Christoph Lameter wrote:

> 32bit sign extension for what? Absolute data references? The addressing
> that I have seen was IP relative. Thus I thought that the kernel could be
> moved lower.

Argh. This is all depending on a special gcc option to compile the
kernel and that option limits the kernel to the upper 2GB. So I guess for
CPU_PTR we need to explicitly load the address as a constant, use that as
a base and then add the offset and the smp_id shifted to it in the
instruction. The CPU_INC/DEC stuff using gs is not affected.