linux-kernel - [PATCH] mshv: hide x86-specific functions on arm64

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251216213619.115259-1-arnd@kernel.org>
Date: Tue, 16 Dec 2025 22:36:12 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: "K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>,
	Dexuan Cui <decui@...rosoft.com>,
	Long Li <longli@...rosoft.com>,
	Stansialv Kinsburskii <skinsburskii@...ux.miscrosoft.com>,
	Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
	Praveen K Paladugu <prapal@...ux.microsoft.com>,
	Easwar Hariharan <easwar.hariharan@...ux.microsoft.com>,
	Anatol Belski <anbelski@...ux.microsoft.com>,
	Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Sean Christopherson <seanjc@...gle.com>,
	Naman Jain <namjain@...ux.microsoft.com>,
	linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mshv: hide x86-specific functions on arm64

From: Arnd Bergmann <arnd@...db.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@...db.de>
---
 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