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 09:17:45 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Saurabh Sengar <ssengar@...ux.microsoft.com>
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 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; }

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

Rob