linux-kernel - Re: [PATCH] ACPI: PM: Export the function acpi_sleep_state

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Message-ID: <20190617130921.GC21113@amd>
Date:   Mon, 17 Jun 2019 15:09:21 +0200
From:   Pavel Machek <pavel@....cz>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     Michael Kelley <mikelley@...rosoft.com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "robert.moore@...el.com" <robert.moore@...el.com>,
        "erik.schmauss@...el.com" <erik.schmauss@...el.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Russ Dill <Russ.Dill@...com>,
        Sebastian Capella <sebastian.capella@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        vkuznets <vkuznets@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>
Subject: Re: [PATCH] ACPI: PM: Export the function
 acpi_sleep_state_supported()


> > 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 problematic
> > since hv_balloon.c needs to be architecture independent when the
> > Hyper-V ARM64 support is added.  If that doesn't change, a per-architecture
> > wrapper will be needed to give hv_balloon.c the correct information.  This
> > 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.
> > 
> > Michael
> 
> + some ARM experts who worked on arch/arm/kernel/hibernate.c.
> 
> 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.
> 
> It looks ARM does not support the ACPI S4 state, then how do we know 
> 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
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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