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Re: [PATCH v2] reboot: Backup orderly_poweroff

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH v2] reboot: Backup orderly_poweroff
Date 2016-01-15 11:20 +0100
Message-ID <qR9E7-4Gx-31@gated-at.bofh.it> (permalink)
References (2 earlier) <qQMoa-51q-9@gated-at.bofh.it> <qQN0S-5vL-15@gated-at.bofh.it> <qQNDz-5Lf-1@gated-at.bofh.it> <qQOgh-6eV-1@gated-at.bofh.it> <qQQ8r-7DE-29@gated-at.bofh.it>
Organization linux.* mail to news gateway

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* One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> wrote:

> > If kernel_power_off() is called then the system should power off. No ifs and 
> > whens.
> 
> Even if it doesn't the watchdog should kill it. 
> 
> That is broken on some platforms on the watchdog side as the
> watchdog shuts down during our power off callbacks - because the system
> firmware is too stupid to reset the watchdog as it powers back up (so
> keeps rebooting).
> 
> If you watchdog and firmware function properly you shouldn't even have to
> care if you crash during the kernel power off.

That's a good point as well - if the system is 'stuck' for some notion of stuck, 
then watchdog drivers can help.

Here it's unclear whether user-space even called the sys_reboot() system call.

Thanks,

	Ingo

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Thread

[PATCH v2] reboot: Backup orderly_poweroff  Keerthy <j-keerthy@ti.com> - 2016-01-13 13:40 +0100
  Re: [PATCH v2] reboot: Backup orderly_poweroff Ingo Molnar <mingo@kernel.org> - 2016-01-14 10:10 +0100
    Re: [PATCH v2] reboot: Backup orderly_poweroff Keerthy <a0393675@ti.com> - 2016-01-14 10:30 +0100
      Re: [PATCH v2] reboot: Backup orderly_poweroff Ingo Molnar <mingo@kernel.org> - 2016-01-14 11:10 +0100
        Re: [PATCH v2] reboot: Backup orderly_poweroff Keerthy <a0393675@ti.com> - 2016-01-14 11:50 +0100
          Re: [PATCH v2] reboot: Backup orderly_poweroff Ingo Molnar <mingo@kernel.org> - 2016-01-14 12:30 +0100
            Re: [PATCH v2] reboot: Backup orderly_poweroff One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-14 14:30 +0100
              Re: [PATCH v2] reboot: Backup orderly_poweroff Ingo Molnar <mingo@kernel.org> - 2016-01-15 11:20 +0100
                Re: [PATCH v2] reboot: Backup orderly_poweroff Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-15 14:40 +0100
                Re: [PATCH v2] reboot: Backup orderly_poweroff Russell King - ARM Linux <linux@arm.linux.org.uk> - 2016-01-15 15:20 +0100
                Re: [PATCH v2] reboot: Backup orderly_poweroff Ingo Molnar <mingo@kernel.org> - 2016-01-19 10:10 +0100
                Re: [PATCH v2] reboot: Backup orderly_poweroff Keerthy <a0393675@ti.com> - 2016-01-19 11:40 +0100
            Re: [PATCH v2] reboot: Backup orderly_poweroff Russell King - ARM Linux <linux@arm.linux.org.uk> - 2016-01-14 15:30 +0100
              Re: [PATCH v2] reboot: Backup orderly_poweroff Ingo Molnar <mingo@kernel.org> - 2016-01-15 11:20 +0100
                Re: [PATCH v2] reboot: Backup orderly_poweroff Russell King - ARM Linux <linux@arm.linux.org.uk> - 2016-01-15 12:10 +0100

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