Hi Will

On 05/18/21 10:47, Will Deacon wrote:

Hi folks,

This is the long-awaited v6 of these patches which I last posted at the
end of last year:

  v1: https://lore.kernel.org/r/20201027215118.27003-1-will@kernel.org (local)
  v2: https://lore.kernel.org/r/20201109213023.15092-1-will@kernel.org (local)
  v3: https://lore.kernel.org/r/20201113093720.21106-1-will@kernel.org (local)
  v4: https://lore.kernel.org/r/20201124155039.13804-1-will@kernel.org (local)
  v5: https://lore.kernel.org/r/20201208132835.6151-1-will@kernel.org (local)

There was also a nice LWN writeup in case you've forgotten what this is
about:

	https://lwn.net/Articles/838339/

It's taken me a while to get a v6 of this together, partly due to
addressing the review feedback on v5, but also because this has now seen
testing on real hardware which threw up some surprises in suspend/resume,
SCHED_DEADLINE and compat hwcap reporting. Thanks to Quentin for helping
me to debug those issues.

The aim of this series is to allow 32-bit ARM applications to run on
arm64 SoCs where not all of the CPUs support the 32-bit instruction set.
Unfortunately, such SoCs are real and will continue to be productised
over the next few years at least. I can assure you that I'm not just
doing this for fun.

Changes in v6 include:

  * Save/restore the affinity mask across execve() to 32-bit and back to
    64-bit again.

  * Allow 32-bit deadline tasks, but skip straight to fallback path when
    determining new affinity mask on execve().

  * Fixed resume-from-suspend path when the resuming CPU is 64-bit-only
    by deferring wake-ups for 32-bit tasks until the secondary CPUs are
    back online.

  * Bug fixes (compat hwcaps, memory leak, cpuset fallback path).

  * Documentation for arm64. It's in the divisive .rst format, but please
    take a look anyway!

I'm pretty happy with this now and it seems to do the right thing,
although the new patches in this revision would certainly benefit from
review. Series based on v5.13-rc1.

It's late Fri and I'm off next week (I'm starting to sense an omen here, it's
the 2nd or 3rd time the post syncs with my holiday), so a bit of a rushed
review but the series looks good to me. Feel free to stick my Reviewed-by for
the series, except patch 13 where I skipped it, given the few comments I had
are addressed.

I did test v5, but not this version. I think it had found better victims to
test it now :-P

Thanks!

--
Qais Yousef