Re: [PATCH v2] x86/xen: fix balloon target initialization for PVH dom0

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

Hi Roger,

kernel test robot noticed the following build errors:

[auto build test ERROR on xen-tip/linux-next]
[also build test ERROR on tip/x86/core linus/master v6.14 next-20250404]
[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/Roger-Pau-Monne/x86-xen-fix-balloon-target-initialization-for-PVH-dom0/20250404-214218
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
patch link:    https://lore.kernel.org/r/20250404133459.16125-1-roger.pau%40citrix.com
patch subject: [PATCH v2] x86/xen: fix balloon target initialization for PVH dom0
config: x86_64-buildonly-randconfig-001-20250405 (https://download.01.org/0day-ci/archive/20250405/202504052022.avvx45LI-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/20250405/202504052022.avvx45LI-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/202504052022.avvx45LI-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/xen/balloon.o: in function `balloon_init':
>> drivers/xen/balloon.c:727: undefined reference to `xen_released_pages'


vim +727 drivers/xen/balloon.c

   716	
   717	static int __init balloon_init(void)
   718	{
   719		struct task_struct *task;
   720		int rc;
   721	
   722		if (!xen_domain())
   723			return -ENODEV;
   724	
   725		pr_info("Initialising balloon driver\n");
   726	
 > 727		if (xen_released_pages >= get_num_physpages()) {
   728			WARN(1, "Released pages underflow current target");
   729			return -ERANGE;
   730		}
   731	
   732		balloon_stats.current_pages = get_num_physpages() - xen_released_pages;
   733		balloon_stats.target_pages  = balloon_stats.current_pages;
   734		balloon_stats.balloon_low   = 0;
   735		balloon_stats.balloon_high  = 0;
   736		balloon_stats.total_pages   = balloon_stats.current_pages;
   737	
   738		balloon_stats.schedule_delay = 1;
   739		balloon_stats.max_schedule_delay = 32;
   740		balloon_stats.retry_count = 1;
   741		balloon_stats.max_retry_count = 4;
   742	

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