[davidhildenbrand:balloon 2/23] drivers/misc/vmw_balloon.c:1857:9: error: 'b' undeclared; did you mean 'mb'?

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/davidhildenbrand/linux balloon
head:   7eef08e97c0bed3ecf03a02e2283be82b9bce389
commit: 754bcc13125987809bf134f12b7d8db0bf74934c [2/23] vmw_balloon: remove vmballoon_compaction_init()
config: x86_64-rhel-9.4 (https://download.01.org/0day-ci/archive/20251019/202510190152.ddbXDK88-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251019/202510190152.ddbXDK88-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510190152.ddbXDK88-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/misc/vmw_balloon.c: In function 'vmballoon_init':
>> drivers/misc/vmw_balloon.c:1857:9: error: 'b' undeclared (first use in this function); did you mean 'mb'?
    1857 |         b->b_dev_info.migratepage = vmballoon_migratepage;
         |         ^
         |         mb
   drivers/misc/vmw_balloon.c:1857:9: note: each undeclared identifier is reported only once for each function it appears in


vim +1857 drivers/misc/vmw_balloon.c

  1837	
  1838	static int __init vmballoon_init(void)
  1839	{
  1840		int error;
  1841	
  1842		/*
  1843		 * Check if we are running on VMware's hypervisor and bail out
  1844		 * if we are not.
  1845		 */
  1846		if (x86_hyper_type != X86_HYPER_VMWARE)
  1847			return -ENODEV;
  1848	
  1849		INIT_DELAYED_WORK(&balloon.dwork, vmballoon_work);
  1850	
  1851		error = vmballoon_register_shrinker(&balloon);
  1852		if (error)
  1853			return error;
  1854	
  1855		balloon_devinfo_init(&balloon.b_dev_info);
  1856	#ifdef CONFIG_BALLOON_COMPACTION
> 1857		b->b_dev_info.migratepage = vmballoon_migratepage;
  1858	#endif /* CONFIG_BALLOON_COMPACTION */
  1859	
  1860		INIT_LIST_HEAD(&balloon.huge_pages);
  1861		spin_lock_init(&balloon.comm_lock);
  1862		init_rwsem(&balloon.conf_sem);
  1863		balloon.vmci_doorbell = VMCI_INVALID_HANDLE;
  1864		balloon.batch_page = NULL;
  1865		balloon.page = NULL;
  1866		balloon.reset_required = true;
  1867	
  1868		queue_delayed_work(system_freezable_wq, &balloon.dwork, 0);
  1869	
  1870		vmballoon_debugfs_init(&balloon);
  1871	
  1872		return 0;
  1873	}
  1874	

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