linux-kernel - Re: [PATCH v7 0/4] Add support for clean shutdown with MSHV

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Message-ID: <20251210081433.GA1238677@ax162>
Date: Wed, 10 Dec 2025 17:14:33 +0900
From: Nathan Chancellor <nathan@...nel.org>
To: Praveen K Paladugu <prapal@...ux.microsoft.com>
Cc: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
	decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
	hpa@...or.com, arnd@...db.de, anbelski@...ux.microsoft.com,
	easwar.hariharan@...ux.microsoft.com,
	nunodasneves@...ux.microsoft.com, skinsburskii@...ux.microsoft.com
Subject: Re: [PATCH v7 0/4] Add support for clean shutdown with MSHV

Hi Praveen,

On Fri, Dec 05, 2025 at 02:17:04PM -0600, Praveen K Paladugu wrote:
...
>   hyperv: Use reboot notifier to configure sleep state
>   hyperv: Cleanly shutdown root partition with MSHV

These two patches result in warnings (that get upgraded to errors with
CONFIG_WERROR=y / W=e) on arm64:

  $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux- clean defconfig

  $ scripts/config -e HYPERV -e MSHV_ROOT

  $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux- olddefconfig drivers/hv/mshv_common.o
  drivers/hv/mshv_common.c:210:6: warning: no previous prototype for 'hv_sleep_notifiers_register' [-Wmissing-prototypes]
    210 | void hv_sleep_notifiers_register(void)
        |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
  drivers/hv/mshv_common.c:224:6: warning: no previous prototype for 'hv_machine_power_off' [-Wmissing-prototypes]
    224 | void hv_machine_power_off(void)
        |      ^~~~~~~~~~~~~~~~~~~~

The prototypes for these functions are only available for x86.

Cheers,
Nathan