Re: [PATCH v1 6/7] vhost: Add kthread support in function vhost_worker_create

[kernel test robot]

Hi Cindy,

kernel test robot noticed the following build warnings:

[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING 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/20240909013531.1243525-7-lulu%40redhat.com
patch subject: [PATCH v1 6/7] vhost: Add kthread support in function vhost_worker_create
config: arc-randconfig-001-20240911 (https://download.01.org/0day-ci/archive/20240911/202409112050.3zbvpbyT-lkp@xxxxxxxxx/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240911/202409112050.3zbvpbyT-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/202409112050.3zbvpbyT-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   drivers/vhost/vhost.c: In function 'vhost_worker_queue':
   drivers/vhost/vhost.c:273:13: error: 'use_kthread' undeclared (first use in this function)
     273 |         if (use_kthread) {
         |             ^~~~~~~~~~~
   drivers/vhost/vhost.c:273:13: note: each undeclared identifier is reported only once for each function it appears in
   drivers/vhost/vhost.c: In function 'vhost_workers_free':
   drivers/vhost/vhost.c:805:13: error: 'use_kthread' undeclared (first use in this function)
     805 |         if (use_kthread)
         |             ^~~~~~~~~~~
   drivers/vhost/vhost.c: In function 'vhost_worker_create':
   drivers/vhost/vhost.c:986:13: error: 'use_kthread' undeclared (first use in this function)
     986 |         if (use_kthread)
         |             ^~~~~~~~~~~
   drivers/vhost/vhost.c: In function 'vhost_free_worker':
   drivers/vhost/vhost.c:1030:13: error: 'use_kthread' undeclared (first use in this function)
    1030 |         if (use_kthread)
         |             ^~~~~~~~~~~
   drivers/vhost/vhost.c: In function 'vhost_worker_create':
>> drivers/vhost/vhost.c:990:1: warning: control reaches end of non-void function [-Wreturn-type]
     990 | }
         | ^


vim +990 drivers/vhost/vhost.c

   983	
   984	static struct vhost_worker *vhost_worker_create(struct vhost_dev *dev)
   985	{
   986		if (use_kthread)
   987			return vhost_worker_create_kthread(dev);
   988		else
   989			return vhost_worker_create_task(dev);
 > 990	}
   991	

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