linux-kernel - Re: [PATCH] Revert "cpuidle: Make drivers initialize polling state"

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Date:   Mon, 5 Feb 2018 16:04:45 +0200
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH] Revert "cpuidle: Make drivers initialize polling state"

On Sun, Feb 04, 2018 at 10:18:07AM +0100, Rafael J. Wysocki wrote:
> On Sun, Feb 4, 2018 at 10:12 AM, Rafael J. Wysocki <rafael@...nel.org> wrote:
> > On Mon, Jan 22, 2018 at 5:27 PM, Ville Syrjala
> > <ville.syrjala@...ux.intel.com> wrote:
> >> From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> >>
> >> This reverts commit 1b39e3f813b4685c7a30ae964d5529a1b0e3a286.
> >>
> >> Makes my P3 machine oops somewhere in cpuidle. I suspect
> >> CONFIG_ACPI=n may have something to do with this.
> >
> > And if you don't do CONFIG_ACPI=n, does it still oops?

Don't think I actually tried that. I can give it a whirl tonight.

I think this machine should actually have ACPI, but it inherited
the .config from a P2 machine that did not. Apparently I was too
lazy to change .config when I swapped in the "new" machine.

> >
> > Anyway, there are later changes depending on this one, so reverting it
> > won't work in general.
> >
> > Let me look deeper at this.
> 
> What's there in /sys/devices/system/cpu/cpuidle/current_driver on your
> system with the problematic commit reverted?

# cat /sys/devices/system/cpu/cpuidle/current_driver
apm_idle

-- 
Ville Syrjälä
Intel OTC