[PATCH 2/2] irqchip: nvic: Use GENERIC_IRQ_MULTI_HANDLER

[Arnd Bergmann]

On Thu, Dec 2, 2021 at 10:33 AM Vladimir Murzin <vladimir.murzin at arm.com> wrote:
>
> On 12/2/21 9:23 AM, Arnd Bergmann wrote:
> > On Thu, Dec 2, 2021 at 9:35 AM Ard Biesheuvel <ardb at kernel.org> wrote:
> >>
> >> It seems trivial enough to add that for v7m as well, so I will include
> >> a patch for it in my v3. But I won't be able to test it, though.
> >
> > Ok, perfect. Adding Jesse to Cc, they are in the process of adding another
> > Cortex-M based platform and should be able to test this by merging in your
> > changes from [1] after you have uploaded the latest version.
>
> I'm happy to test it as well. I'm wondering if there are specific scenarios
> (or maybe some tests) to consider?

If the IRQ stacks fail in some way, it most likely won't boot at all, so as long
as you can get into user space, I'd be 99% confident that it's good.

For the MMU based platforms, the series lets us detect stack overflows
when either the per-thread stack or the IRQ stack runs into an unmapped
vmalloc page, and there are some unit tests that exercise this.
I don't think you can do this with the MPU though, and certainly not when
the MPU is disabled.

       Arnd