[PATCH] arm64: Allow CPUs unffected by ARM erratum 1418040 to come in late

Matthias Kaehlcke mka at chromium.org
Fri Sep 11 14:59:03 EDT 2020

On Fri, Sep 11, 2020 at 07:16:11PM +0100, Marc Zyngier wrote:
> Now that we allow CPUs affected by erratum 1418040 to come in late,
> this prevents their unaffected sibblings from coming in late (or
> coming back after a suspend or hotplug-off, which amounts to the
> same thing).
> To allow this, we need to add ARM64_CPUCAP_OPTIONAL_FOR_LATE_CPU,
> which amounts to set .type to ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE.
> Reported-by: Doug Anderson <dianders at google.com>
> Tested-by: Sai Prakash Ranjan <saiprakash.ranjan at codeaurora.org>
> Fixes: bf87bb0881d0 ("arm64: Allow booting of late CPUs affected by erratum 1418040")
> Signed-off-by: Marc Zyngier <maz at kernel.org>

Tested-by: Matthias Kaehlcke <mka at chromium.org>

And I guess I deserve brownie points for having found the problem
initially and identified the offending commit, even though it was
Doug who reported it to the list :)

Reported-by: Matthias Kaehlcke <mka at chromium.org>

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