From: Wei Liu <wei.liu@kernel.org>
To: Arnd Bergmann <arnd@kernel.org>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Long Li <longli@microsoft.com>,
Stansialv Kinsburskii <skinsburskii@linux.miscrosoft.com>,
Nuno Das Neves <nunodasneves@linux.microsoft.com>,
Praveen K Paladugu <prapal@linux.microsoft.com>,
Easwar Hariharan <easwar.hariharan@linux.microsoft.com>,
Anatol Belski <anbelski@linux.microsoft.com>,
Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>,
Arnd Bergmann <arnd@arndb.de>,
Sean Christopherson <seanjc@google.com>,
Naman Jain <namjain@linux.microsoft.com>,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mshv: hide x86-specific functions on arm64
Date: Tue, 16 Dec 2025 22:21:29 +0000 [thread overview]
Message-ID: <20251216222129.GA1300707@liuwe-devbox-debian-v2.local> (raw)
In-Reply-To: <20251216213619.115259-1-arnd@kernel.org>
On Tue, Dec 16, 2025 at 10:36:12PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> The hv_sleep_notifiers_register() and hv_machine_power_off() functions are
> only called and declared on x86, but cause a warning on arm64:
>
> drivers/hv/mshv_common.c:210:6: error: no previous prototype for 'hv_sleep_notifiers_register' [-Werror=missing-prototypes]
> 210 | void hv_sleep_notifiers_register(void)
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/hv/mshv_common.c:224:6: error: no previous prototype for 'hv_machine_power_off' [-Werror=missing-prototypes]
> 224 | void hv_machine_power_off(void)
> | ^~~~~~~~~~~~~~~~~~~~
>
> Hide both inside of an #ifdef block.
>
> Fixes: f0be2600ac55 ("mshv: Use reboot notifier to configure sleep state")
> Fixes: 615a6e7d83f9 ("mshv: Cleanly shutdown root partition with MSHV")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Thanks Arnd. I have a queued up a patch which make available the
declarations to arm64. Let me think about whether to use your patch
instead.
Anyway, this issue will be fixed one way or the other once I send a PR
to Linus.
Wei
> ---
> drivers/hv/mshv_common.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/hv/mshv_common.c b/drivers/hv/mshv_common.c
> index 58027b23c206..63f09bb5136e 100644
> --- a/drivers/hv/mshv_common.c
> +++ b/drivers/hv/mshv_common.c
> @@ -142,6 +142,7 @@ int hv_call_get_partition_property(u64 partition_id,
> }
> EXPORT_SYMBOL_GPL(hv_call_get_partition_property);
>
> +#ifdef CONFIG_X86
> /*
> * Corresponding sleep states have to be initialized in order for a subsequent
> * HVCALL_ENTER_SLEEP_STATE call to succeed. Currently only S5 state as per
> @@ -237,3 +238,4 @@ void hv_machine_power_off(void)
> BUG();
>
> }
> +#endif
> --
> 2.39.5
>
next prev parent reply other threads:[~2025-12-16 22:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-16 21:36 Arnd Bergmann
2025-12-16 22:21 ` Wei Liu [this message]
2025-12-17 0:45 ` Stanislav Kinsburskii
2025-12-18 19:15 ` Wei Liu
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