Re: broken local_t on i386

Christoph Lameter
2006-06-12T19:15:53Z

On Mon, 12 Jun 2006, Andi Kleen wrote:

> > I thought you had some funky segment registers on i386 and x86_64. Cant
> > they be switched on context switch? If an inc/dec could work relative to
> > those then you would not need a virtual mapping.
>
> The segment register needs an offset. So you need the linker to generate
> the offset from the base of the per cpu segment somehow. At compile time the
> address is not known so it cannot be done then.

Define something like a big struct and use offsetof?

So the compiler is not able to generate an offset to the beginning of a
data segment?