Re: [PATCH 3/3] vmw_balloon: open-code vmballoon_compaction_init()

[kernel test robot]

Hi Nadav,

I love your patch! Yet something to improve:

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on linus/master v6.0-rc5 next-20220915]
[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/Nadav-Amit/vmw_balloon-misc-fixes-and-enhancements/20220914-021333
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git ceecbbddbf549fe0b7ffa3804a6e255b3360030f
config: x86_64-randconfig-a014 (https://download.01.org/0day-ci/archive/20220916/202209161512.GNTVEnlu-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/aa1f38765dd703cbeb3450454d0b5b2c7f5a8f8d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Nadav-Amit/vmw_balloon-misc-fixes-and-enhancements/20220914-021333
        git checkout aa1f38765dd703cbeb3450454d0b5b2c7f5a8f8d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> drivers/misc/vmw_balloon.c:1892:3: error: use of undeclared identifier 'b'
                   b->b_dev_info.migratepage = vmballoon_migratepage;
                   ^
   drivers/misc/vmw_balloon.c:1732:2: error: unterminated conditional directive
   #ifdef CONFIG_BALLOON_COMPACTION
    ^
   2 errors generated.


vim +/b +1892 drivers/misc/vmw_balloon.c

  1850	
  1851	static int __init vmballoon_init(void)
  1852	{
  1853		int error;
  1854	
  1855		/*
  1856		 * Check if we are running on VMware's hypervisor and bail out
  1857		 * if we are not.
  1858		 */
  1859		if (x86_hyper_type != X86_HYPER_VMWARE)
  1860			return -ENODEV;
  1861	
  1862		INIT_LIST_HEAD(&balloon.huge_pages);
  1863		spin_lock_init(&balloon.comm_lock);
  1864		init_rwsem(&balloon.conf_sem);
  1865		balloon.vmci_doorbell = VMCI_INVALID_HANDLE;
  1866		balloon.batch_page = NULL;
  1867		balloon.page = NULL;
  1868		balloon.reset_required = true;
  1869	
  1870		/*
  1871		 * Reset the balloon to check that it is indeed supported.
  1872		 */
  1873		error = vmballoon_reset(&balloon);
  1874		if (error) {
  1875			pr_err("memory ballooning is disabled");
  1876			goto fail;
  1877		}
  1878	
  1879		INIT_DELAYED_WORK(&balloon.dwork, vmballoon_work);
  1880	
  1881		error = vmballoon_register_shrinker(&balloon);
  1882		if (error)
  1883			goto fail;
  1884	
  1885		/*
  1886		 * Initialization of compaction must be done after the call to
  1887		 * balloon_devinfo_init() .
  1888		 */
  1889		balloon_devinfo_init(&balloon.b_dev_info);
  1890	
  1891		if (IS_ENABLED(CONFIG_BALLOON_COMPACTION))
> 1892			b->b_dev_info.migratepage = vmballoon_migratepage;
  1893	
  1894		queue_delayed_work(system_freezable_wq, &balloon.dwork, 0);
  1895	
  1896		vmballoon_debugfs_init(&balloon);
  1897	
  1898		return 0;
  1899	fail:
  1900		vmballoon_unregister_shrinker(&balloon);
  1901		return error;
  1902	}
  1903	

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