Re: [PATCH 2/3] virtio_balloon: introduce memory allocation stall counter

[kernel test robot]

Hi zhenwei,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.9-rc4 next-20240419]
[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/zhenwei-pi/virtio_balloon-introduce-oom-kill-invocations/20240418-142934
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240418062602.1291391-3-pizhenwei%40bytedance.com
patch subject: [PATCH 2/3] virtio_balloon: introduce memory allocation stall counter
config: i386-randconfig-141-20240421 (https://download.01.org/0day-ci/archive/20240421/202404211106.B9pwuFqk-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240421/202404211106.B9pwuFqk-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404211106.B9pwuFqk-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/virtio/virtio_balloon.c:324:18: warning: unused variable 'stall' [-Wunused-variable]
     324 |         long available, stall = 0;
         |                         ^~~~~
   1 warning generated.


vim +/stall +324 drivers/virtio/virtio_balloon.c

   318	
   319	static unsigned int update_balloon_stats(struct virtio_balloon *vb)
   320	{
   321		unsigned long events[NR_VM_EVENT_ITEMS];
   322		struct sysinfo i;
   323		unsigned int idx = 0;
 > 324		long available, stall = 0;
   325		unsigned long caches;
   326	
   327		all_vm_events(events);
   328		si_meminfo(&i);
   329	
   330		available = si_mem_available();
   331		caches = global_node_page_state(NR_FILE_PAGES);
   332	

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