linux-kernel - drivers/misc/vmw_balloon.c:200: warning: Function parameter or member '5' not described in 'vmballoon_batch

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Date:   Mon, 6 Nov 2023 14:18:11 +0800
From:   kernel test robot <yujie.liu@...el.com>
To:     Nadav Amit <namit@...are.com>
CC:     <oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        "Xavier Deguillard" <xdeguillard@...are.com>
Subject: drivers/misc/vmw_balloon.c:200: warning: Function parameter or
 member '5' not described in 'vmballoon_batch_entry'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   77fa2fbe87fc605c4bfa87dff87be9bfded0e9a3
commit: 6c94875799eaf99bfdbb0efce21d75e1c56e96d5 vmw_balloon: simplifying batch access
date:   5 years ago
config: x86_64-randconfig-103-20230827 (https://download.01.org/0day-ci/archive/20231106/202311061016.YX1N3JbG-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231106/202311061016.YX1N3JbG-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 <yujie.liu@...el.com>
| Closes: https://lore.kernel.org/r/202311061016.YX1N3JbG-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/misc/vmw_balloon.c:28:
   include/linux/vmw_vmci_defs.h:159:33: warning: 'VMCI_ANON_SRC_HANDLE' defined but not used [-Wunused-const-variable=]
     159 | static const struct vmci_handle VMCI_ANON_SRC_HANDLE = {
         |                                 ^~~~~~~~~~~~~~~~~~~~
>> drivers/misc/vmw_balloon.c:200: warning: Function parameter or member '5' not described in 'vmballoon_batch_entry'
   drivers/misc/vmw_balloon.o: warning: objtool: vmballoon_deflate()+0x1ca: sibling call from callable instruction with modified stack frame
   drivers/misc/vmw_balloon.o: warning: objtool: vmballoon_debug_show()+0x73: sibling call from callable instruction with modified stack frame
   drivers/misc/vmw_balloon.o: warning: objtool: vmballoon_inflate()+0xa1: sibling call from callable instruction with modified stack frame
   drivers/misc/vmw_balloon.o: warning: objtool: vmballoon_work()+0x84: sibling call from callable instruction with modified stack frame


vim +200 drivers/misc/vmw_balloon.c

365bd7ef7ec8eb Philip P. Moltmann 2015-08-06  188  
6c94875799eaf9 Nadav Amit         2018-09-20  189  /**
6c94875799eaf9 Nadav Amit         2018-09-20  190   * struct vmballoon_batch_entry - a batch entry for lock or unlock.
6c94875799eaf9 Nadav Amit         2018-09-20  191   *
6c94875799eaf9 Nadav Amit         2018-09-20  192   * @status: the status of the operation, which is written by the hypervisor.
6c94875799eaf9 Nadav Amit         2018-09-20  193   * @reserved: reserved for future use. Must be set to zero.
6c94875799eaf9 Nadav Amit         2018-09-20  194   * @pfn: the physical frame number of the page to be locked or unlocked.
6c94875799eaf9 Nadav Amit         2018-09-20  195   */
6c94875799eaf9 Nadav Amit         2018-09-20  196  struct vmballoon_batch_entry {
6c94875799eaf9 Nadav Amit         2018-09-20  197  	u64 status : 5;
6c94875799eaf9 Nadav Amit         2018-09-20  198  	u64 reserved : PAGE_SHIFT - 5;
6c94875799eaf9 Nadav Amit         2018-09-20  199  	u64 pfn : 52;
6c94875799eaf9 Nadav Amit         2018-09-20 @200  } __packed;
6c94875799eaf9 Nadav Amit         2018-09-20  201  

-- 
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https://github.com/intel/lkp-tests/wiki