linux-kernel - RE: [PATCH v2 2/6] Drivers: hv: allow non ACPI compilation for hv_is_hibernation

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Message-ID: <BYAPR21MB1688813B65EEDB79554E30D4D7D19@BYAPR21MB1688.namprd21.prod.outlook.com>
Date:   Wed, 1 Feb 2023 17:47:44 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Saurabh Sengar <ssengar@...ux.microsoft.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Saurabh Singh Sengar <ssengar@...rosoft.com>
Subject: RE: [PATCH v2 2/6] Drivers: hv: allow non ACPI compilation for
 hv_is_hibernation_supported

From: Saurabh Sengar <ssengar@...ux.microsoft.com> Sent: Tuesday, January 31, 2023 10:10 AM
> 
> acpi_sleep_state_supported API is only define for CONFIG_ACPI flag and
> thus it can't be used for non-ACPI builds. Initaly there won't be

s/Initaly/Initially/

> hibernate support for non ACPI builds.

s/hibernate/hibernation/

> 
> This change will help adding device tree support in subsequent commits.
> 
> Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.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);
> +#else
> +	return false;
> +#endif

Is this patch needed?  If CONFIG_ACPI is not set, then per
arch/x86/Kconfig, CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT
is not selected.  In that case, the #ifdef in include/acpi/acpi_bus.h
provides a stub for acpi_sleep_state_supported() that returns "false".
So it seems like the existing code should compile and correctly return
"false" when CONFIG_ACPI is not set.

Michael

>  }
>  EXPORT_SYMBOL_GPL(hv_is_hibernation_supported);
> 
> --
> 2.25.1