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Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu

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From	Mark Rutland <mark.rutland@arm.com>
Newsgroups	linux.kernel
Subject	Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu
Date	Mon, 27 Jun 2016 17:00:01 +0200
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On Mon, Jun 27, 2016 at 02:53:16PM +0200, Hans de Goede wrote:
> Note this does not mean that all pm_power_off implementations
> are going to be happy with machine_power_off leaving irqs
> enabled, I would esp. expect the efi and psci implementations
> to potentially be unhappy about this. See below for a proposal
> to deal with this.

Neither PSCI nor EFI care either way about interrupts.

PSCI makes synchronous HVC/SMC calls to a higher exception level, and
can be safely called with interrupts enabled or disabled.

EFI's ResetSystem (which backs pm_power_off) can be called with
interrupts enabled or disabled, so long as there is not a clashing call
in progress already (see 7.1 "Runtime Services Rules and Restrictions")
in the EFI 2.6 spec.

Thanks,
Mark.

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Thread

BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Hans de Goede <hdegoede@redhat.com> - 2016-06-26 18:10 +0200
  Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Marc Zyngier <marc.zyngier@arm.com> - 2016-06-27 11:20 +0200
    Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-06-27 11:50 +0200
      Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Hans de Goede <hdegoede@redhat.com> - 2016-06-27 13:00 +0200
        Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-06-27 13:40 +0200
          Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-06-27 13:50 +0200
          Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Hans de Goede <hdegoede@redhat.com> - 2016-06-27 15:00 +0200
            Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-06-27 16:00 +0200
              Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Hans de Goede <hdegoede@redhat.com> - 2016-06-27 16:40 +0200
            Re: BUG?: kernel does not (re)set irq smp_affinity to reboot_cpu Mark Rutland <mark.rutland@arm.com> - 2016-06-27 17:00 +0200

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