linux-kernel - Re: [PATCH v5 3/3] hyperv: Cleanly shutdown root partition with MSHV

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Message-ID: <202511182353.5FvVmUhR-lkp@intel.com>
Date: Tue, 18 Nov 2025 23:53:55 +0800
From: kernel test robot <lkp@...el.com>
To: Praveen K Paladugu <prapal@...ux.microsoft.com>, 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
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	anbelski@...ux.microsoft.com, prapal@...ux.microsoft.com,
	easwar.hariharan@...ux.microsoft.com,
	nunodasneves@...ux.microsoft.com, skinsburskii@...ux.microsoft.com
Subject: Re: [PATCH v5 3/3] hyperv: Cleanly shutdown root partition with MSHV

Hi Praveen,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20251117]
[cannot apply to tip/x86/core linus/master v6.18-rc6 v6.18-rc5 v6.18-rc4 v6.18-rc6]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Praveen-K-Paladugu/hyperv-Add-definitions-for-MSHV-sleep-state-configuration/20251118-051204
base:   next-20251117
patch link:    https://lore.kernel.org/r/20251117210855.108126-4-prapal%40linux.microsoft.com
patch subject: [PATCH v5 3/3] hyperv: Cleanly shutdown root partition with MSHV
config: arm64-randconfig-003-20251118 (https://download.01.org/0day-ci/archive/20251118/202511182353.5FvVmUhR-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251118/202511182353.5FvVmUhR-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511182353.5FvVmUhR-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/hv/mshv_common.c:210:6: warning: no previous prototype for function 'hv_sleep_notifiers_register' [-Wmissing-prototypes]
     210 | void hv_sleep_notifiers_register(void)
         |      ^
   drivers/hv/mshv_common.c:210:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     210 | void hv_sleep_notifiers_register(void)
         | ^
         | static 
>> drivers/hv/mshv_common.c:224:6: warning: no previous prototype for function 'hv_machine_power_off' [-Wmissing-prototypes]
     224 | void hv_machine_power_off(void)
         |      ^
   drivers/hv/mshv_common.c:224:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     224 | void hv_machine_power_off(void)
         | ^
         | static 
   2 warnings generated.


vim +/hv_machine_power_off +224 drivers/hv/mshv_common.c

   219	
   220	/*
   221	 * Power off the machine by entering S5 sleep state via Hyper-V hypercall.
   222	 * This call does not return if successful.
   223	 */
 > 224	void hv_machine_power_off(void)
   225	{
   226		unsigned long flags;
   227		struct hv_input_enter_sleep_state *in;
   228	
   229		local_irq_save(flags);
   230		in = *this_cpu_ptr(hyperv_pcpu_input_arg);
   231		in->sleep_state = HV_SLEEP_STATE_S5;
   232	
   233		(void)hv_do_hypercall(HVCALL_ENTER_SLEEP_STATE, in, NULL);
   234		local_irq_restore(flags);
   235	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki