Re: [PATCH 0/3] IRQ stack support for ARM

[Arnd Bergmann]

On Wed, Oct 21, 2020 at 2:34 PM Russell King - ARM Linux admin
<linux@xxxxxxxxxxxxxxx> wrote:
>
> We don't do it because we don't have a separate register to be able
> to store the thread_info pointer, and copying that lump between the
> SVC and IRQ stack will add massively to IRQ latency, especially for
> older machines.

I forwarded my other reply as well, in which I suggested using
CONFIG_THREAD_INFO_IN_TASK, wouldn't that solve the problem?

      Arnd