linux-kernel - RE: [PATCH v4 2/6] Drivers: hv: allow non ACPI compilation for hv_is_hibernation

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Date:   Wed, 8 Feb 2023 01:35:05 +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>,
        "dphadke@...ux.microsoft.com" <dphadke@...ux.microsoft.com>
Subject: RE: [PATCH v4 2/6] Drivers: hv: allow non ACPI compilation for
 hv_is_hibernation_supported

From: Saurabh Sengar <ssengar@...ux.microsoft.com> Sent: Monday, February 6, 2023 11:50 PM
> 
> acpi_sleep_state_supported API is only define for CONFIG_ACPI flag and
> thus it can't be used for non-ACPI builds. Initially there won't be
> hibernation support for non ACPI builds.
> 
> This change will help adding device tree support in subsequent commits.

In keeping with the guideline to avoid references like "this patch" or "this
change" in commit messages, I'd suggest wording the commit message
something like the following:

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.

With that update,
Reviewed-by: Michael Kelley

I gave a Reviewed-by on Patch 1 of this series, but the same comment
applies about "this change" in that commit message.

Michael

> 
> 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 52a6f89..370ec20 100644
> --- a/drivers/hv/hv_common.c
> +++ b/drivers/hv/hv_common.c
> @@ -234,7 +234,11 @@ void hv_setup_dma_ops(struct device *dev, bool coherent)
> 
>  bool hv_is_hibernation_supported(void)
>  {
> +#ifdef CONFIG_ACPI
>  	return !hv_root_partition && acpi_sleep_state_supported(ACPI_STATE_S4);
> +#else
> +	return false;
> +#endif
>  }
>  EXPORT_SYMBOL_GPL(hv_is_hibernation_supported);
> 
> --
> 1.8.3.1