[PATCH v3 7/7] ARM: implement support for vmap'ed stacks

[Ard Biesheuvel]

On Wed, 17 Nov 2021 at 08:59, Tony Lindgren <tony at atomide.com> wrote:
>
> * Ard Biesheuvel <ardb at kernel.org> [211116 22:03]:
> > Of course, I may have missed something, but I wouldn't expect a
> > fundamental flaw in this logic to affect only OMAP3/4 based platforms
> > in such a weird way. Perhaps there is something I missed in terms of
> > TLB maintenance, although I would expect the existing fault handler to
> > take care of that.
>
> Looks like disabling the deeper idle states for cpuidle where the CPUSs
> get shut down and restored seems to work around the issue at least for
> omap4. The assembly code is in arch/arm/mach-omap2/sleep44xx.S, and in
> sleep34xx.S for omap3. No idea so far what might be causing this..
>

Thanks Tony, that is very helpful. I have a Beaglebone white somewhere
so I'll try and reproduce it locally as well.