[GIT PULL] IRQ stacks and vmap'ed stack for ARM

[Arnd Bergmann]

On Wed, Dec 8, 2021 at 10:26 AM Ard Biesheuvel <ardb at kernel.org> wrote:

> ----------------------------------------------------------------
> ARM: support for IRQ and vmap'ed stacks
>
> This PR covers all the work related to implementing IRQ stacks and
> vmap'ed stacks for all 32-bit ARM systems that are currently supported
> by the Linux kernel, including RiscPC and Footbridge. It has been
> submitted for review in three different waves:
> - IRQ stacks support for v7 SMP systems [0],
> - vmap'ed stacks support for v7 SMP systems[1],
> - extending support for both IRQ stacks and vmap'ed stacks for all
>   remaining configurations, including v6/v7 SMP multiplatform kernels
>   and uniprocessor configurations including v7-M [2]
>

I don't understand all the changes in the entry code, but the parts that
I do understand all look good to me, I hope this can make it into v5.17.

Reviewed-by: Arnd Bergmann <arnd at arndb.de>