Re: [PATCH] ACPI: PM: Export the function acpi_sleep_state_supported()

From: Pavel Machek
Date: Mon Jun 17 2019 - 09:14:19 EST

> > 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.

(cesky, pictures)

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