linux-kernel - Re: [PATCH v5 2/5] Drivers: hv: allow non ACPI compilation for hv_is_hibernation

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Date:   Thu, 9 Feb 2023 09:29:34 -0800
From:   Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     krzysztof.kozlowski+dt@...aro.org, kys@...rosoft.com,
        haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
        daniel.lezcano@...aro.org, tglx@...utronix.de,
        virtualization@...ts.linux-foundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, mikelley@...rosoft.com,
        dphadke@...ux.microsoft.com
Subject: Re: [PATCH v5 2/5] Drivers: hv: allow non ACPI compilation for
 hv_is_hibernation_supported

On Thu, Feb 09, 2023 at 09:17:45AM -0600, Rob Herring wrote:
> On Thu, Feb 9, 2023 at 6:15 AM Saurabh Sengar
> <ssengar@...ux.microsoft.com> wrote:
> >
> > acpi_sleep_state_supported() currently is defined only when
> > CONFIG_ACPI=y.  For future work to enable device tree builds, put this
> > function under #ifdef CONFIG_ACPI.  Otherwise, return 'false' from
> > hv_is_hibernation_supported() as Hyper-V guest configs using device
> > tree don't support hibernation.
> >
> > Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> > Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> > ---
> >  drivers/hv/hv_common.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
> > index 52a6f89ccdbd..370ec20d1993 100644
> > --- a/drivers/hv/hv_common.c
> > +++ b/drivers/hv/hv_common.c
> > @@ -234,7 +234,11 @@ EXPORT_SYMBOL_GPL(hv_setup_dma_ops);
> >
> >  bool hv_is_hibernation_supported(void)
> >  {
> > +#ifdef CONFIG_ACPI
> >         return !hv_root_partition && acpi_sleep_state_supported(ACPI_STATE_S4);
> 
> Rework the acpi_bus.h header so that this is defined for !CONFIG_ACPI:
> 
> static inline bool acpi_sleep_state_supported(u8 sleep_state) { return false; }

Sure,
acpi_bus.h doesn't get included in case of !ACPI, I will put this in include/linux/acpi.h

Regards,
Saurabh

> 
> Then you don't need this change here. That or using IS_ENABLED() is
> strongly preferred over #ifdefs.
> 
> Rob