[RFC PATCH 1/8] arm64: add CPU field to struct thread_info

[Ard Biesheuvel]

On Tue, 14 Sept 2021 at 17:41, Linus Torvalds
<torvalds at linux-foundation.org> wrote:
>
> On Tue, Sep 14, 2021 at 5:10 AM Ard Biesheuvel <ardb at kernel.org> wrote:
> >
> > The CPU field will be moved back into thread_info even when
> > THREAD_INFO_IN_TASK is enabled, so add it back to arm64's definition of
> > struct thread_info.
>
> The series looks sane to me, but it strikes me that it's inconsistent
> - here for arm64, you make it unconditional, but for the other
> architectures you end up putting it inside a #ifdef CONFIG_SMP.
>
> Was there some reason for this odd behavior?
>

Yes. CONFIG_SMP is a 'def_bool y' on arm64.