Re: [PATCH v2 00/21] arm64: Move overflow sp into SP_EL1 and kernel sp into SP_EL0

[Linus Walleij]

On Fri, Sep 18, 2026 at 6:14 PM Will Deacon <will@xxxxxxxxxx> wrote:

> This is version two of the kernel stack juggling patches I previously
> posted here:
>
>   https://lore.kernel.org/r/20260907164247.17223-1-will@xxxxxxxxxx
>
> Changes since v1 include:
>   * Fixed suspend/resume paths to handle the stack pointers properly
>   * Fixed restoration of ptrauth keys on resume
>   * Added tags

Overall I like what I see, but can we split it in two... like first the patches
up to fixing the overflow handling using SP_EL0 and finalize that?

Hopefully Usama can test just that part and see if it has a lesser
performance impact as well.

Then we can think about the rest once that is merged and works.

Yours,
Linus Walleij