linux-kernel - Re: [PATCH v4 3/3] hyperv: Cleanly shutdown root partition with MSHV

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Message-ID: <202511082249.JoKyyEEZ-lkp@intel.com>
Date: Sat, 8 Nov 2025 22:26:49 +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: 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,
	mhklinux@...look.com
Subject: Re: [PATCH v4 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-20251107]
[cannot apply to tip/x86/core linus/master v6.18-rc4 v6.18-rc3 v6.18-rc2 v6.18-rc4]
[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/20251108-061825
base:   next-20251107
patch link:    https://lore.kernel.org/r/20251107221700.45957-4-prapal%40linux.microsoft.com
patch subject: [PATCH v4 3/3] hyperv: Cleanly shutdown root partition with MSHV
config: x86_64-randconfig-122-20251108 (https://download.01.org/0day-ci/archive/20251108/202511082249.JoKyyEEZ-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251108/202511082249.JoKyyEEZ-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/202511082249.JoKyyEEZ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/hv/mshv_common.c:227:6: warning: variable 'status' set but not used [-Wunused-but-set-variable]
     227 |         u64 status;
         |             ^
   1 warning generated.


vim +/status +227 drivers/hv/mshv_common.c

   220	
   221	/*
   222	 * Power off the machine by entering S5 sleep state via Hyper-V hypercall.
   223	 * This call does not return if successful.
   224	 */
   225	void hv_machine_power_off(void)
   226	{
 > 227		u64 status;
   228		unsigned long flags;
   229		struct hv_input_enter_sleep_state *in;
   230	
   231		local_irq_save(flags);
   232		in = *this_cpu_ptr(hyperv_pcpu_input_arg);
   233		in->sleep_state = HV_SLEEP_STATE_S5;
   234	
   235		status = hv_do_hypercall(HVCALL_ENTER_SLEEP_STATE, in, NULL);
   236		local_irq_restore(flags);
   237	

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