Re: [PATCH v1 2/7] vhost: Add kthread support in function vhost_worker_queue()

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

Hi Cindy,

kernel test robot noticed the following build errors:

[auto build test ERROR on mst-vhost/linux-next]
[also build test ERROR on linus/master v6.11-rc7 next-20240910]
[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/Cindy-Lu/vhost-Add-a-new-module_param-for-enable-kthread/20240909-093852
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link:    https://lore.kernel.org/r/20240909013531.1243525-3-lulu%40redhat.com
patch subject: [PATCH v1 2/7] vhost: Add kthread support in function vhost_worker_queue()
config: arc-randconfig-001-20240911 (https://download.01.org/0day-ci/archive/20240911/202409111842.o3eEppU6-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240911/202409111842.o3eEppU6-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/202409111842.o3eEppU6-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/vhost/vhost.c: In function 'vhost_worker_queue':
>> drivers/vhost/vhost.c:272:13: error: 'use_kthread' undeclared (first use in this function)
     272 |         if (use_kthread) {
         |             ^~~~~~~~~~~
   drivers/vhost/vhost.c:272:13: note: each undeclared identifier is reported only once for each function it appears in


vim +/use_kthread +272 drivers/vhost/vhost.c

   268	
   269	static void vhost_worker_queue(struct vhost_worker *worker,
   270				       struct vhost_work *work)
   271	{
 > 272		if (use_kthread) {
   273			vhost_work_queue_kthread(worker, work);
   274		} else {
   275			vhost_worker_queue_task(worker, work);
   276		}
   277	}
   278	bool vhost_vq_work_queue(struct vhost_virtqueue *vq, struct vhost_work *work)
   279	{
   280		struct vhost_worker *worker;
   281		bool queued = false;
   282	
   283		rcu_read_lock();
   284		worker = rcu_dereference(vq->worker);
   285		if (worker) {
   286			queued = true;
   287			vhost_worker_queue(worker, work);
   288		}
   289		rcu_read_unlock();
   290	
   291		return queued;
   292	}
   293	EXPORT_SYMBOL_GPL(vhost_vq_work_queue);
   294	

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