From: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
To: Wei Liu <wei.liu@kernel.org>
Cc: Arnd Bergmann <arnd@kernel.org>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
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>,
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 16:45:12 -0800 [thread overview]
Message-ID: <aUH9GGzROHfbP6pj@skinsburskii.localdomain> (raw)
In-Reply-To: <20251216222129.GA1300707@liuwe-devbox-debian-v2.local>
On Tue, Dec 16, 2025 at 10:21:29PM +0000, Wei Liu wrote:
> 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.
>
The whole idea of mshv_common.c is to have common code for all archs.
It would be nice to keep this file as it is.
Thanks,
Stanislav
> 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:[~2025-12-17 0:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-16 21:36 [PATCH] mshv: hide x86-specific functions on arm64 Arnd Bergmann
2025-12-16 22:21 ` Wei Liu
2025-12-17 0:45 ` Stanislav Kinsburskii [this message]
2025-12-18 19:15 ` Wei Liu
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