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Date:   Mon, 17 Jun 2019 15:09:21 +0200
From:   Pavel Machek <pavel@ucw.cz>
To:     Dexuan Cui <decui@microsoft.com>
Cc:     Michael Kelley <mikelley@microsoft.com>,
        "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
        "rjw@rjwysocki.net" <rjw@rjwysocki.net>,
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        "robert.moore@intel.com" <robert.moore@intel.com>,
        "erik.schmauss@intel.com" <erik.schmauss@intel.com>,
        Russell King <rmk+kernel@arm.linux.org.uk>,
        Russ Dill <Russ.Dill@ti.com>,
        Sebastian Capella <sebastian.capella@linaro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        KY Srinivasan <kys@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
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        "jasowang@redhat.com" <jasowang@redhat.com>,
        vkuznets <vkuznets@redhat.com>,
        "marcelo.cerri@canonical.com" <marcelo.cerri@canonical.com>
Subject: Re: [PATCH] ACPI: PM: Export the function
 acpi_sleep_state_supported()
Message-ID: <20190617130921.GC21113@amd>
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> > It seems that sleep.c isn't built when on the ARM64 architecture.  Using
> > acpi_sleep_state_supported() directly in hv_balloon.c will be problemat=
ic
> > since hv_balloon.c needs to be architecture independent when the
> > Hyper-V ARM64 support is added.  If that doesn't change, a per-architec=
ture
> > wrapper will be needed to give hv_balloon.c the correct information.  T=
his
> > may affect whether acpi_sleep_state_supported() needs to be exported vs.
> > just removing the "static".   I'm not sure what the best approach is.
> >=20
> > Michael
>=20
> + some ARM experts who worked on arch/arm/kernel/hibernate.c.
>=20
> drivers/acpi/sleep.c is only built if ACPI_SYSTEM_POWER_STATES_SUPPORT
> is defined, but it looks this option is not defined on ARM.
>=20
> It looks ARM does not support the ACPI S4 state, then how do we know=20
> if an ARM host supports hibernation or not?

But actually... I remember ELCE talk about hibernation or ARM32. Not
sure if patches are mainline, but someone was working on that.

									Pavel
--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

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