Re: [PATCH 03/35] x86/entry/32: Load task stack from x86_tss.sp1 in SYSENTER handler

[Linus Torvalds]

On Wed, Apr 18, 2018 at 4:26 PM, Andi Kleen <ak@xxxxxxxxxxxxxxx> wrote:
>
> Seems like a hack. Why can't that be stored in a per cpu variable?

It *is* a percpu variable - the whole x86_tss structure is percpu.

I guess it could be a different (separate) percpu variable, but might
as well use the space we already have allocated.

             Linus