* Re: [PATCH] kthread: Teach lockdep about kthread_flush_work() dependencies
[not found] <6dee36e290c2a3b85dcd7cdba2cab72fe57b25c4.camel@infradead.org>
@ 2026-10-21 9:55 ` kernel test robot
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From: kernel test robot @ 2026-10-21 9:55 UTC (permalink / raw)
To: David Woodhouse, Benson Leung, Tzung-Bi Shih, Guenter Roeck,
Frederic Weisbecker, Waiman Long, Christian Brauner,
David Woodhouse, Jann Horn, Kees Cook, Breno Leitao,
chrome-platform, linux-kernel
Cc: llvm, oe-kbuild-all, Ingo Molnar, Will Deacon, Boqun Feng
Hi David,
kernel test robot noticed the following build warnings:
[auto build test WARNING on chrome-platform/for-next]
[also build test WARNING on chrome-platform/for-firmware-next linus/master v7.3 next-20261019]
[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/David-Woodhouse/kthread-Teach-lockdep-about-kthread_flush_work-dependencies/20261020-160400
base: https://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux.git for-next
patch link: https://lore.kernel.org/r/6dee36e290c2a3b85dcd7cdba2cab72fe57b25c4.camel%40infradead.org
patch subject: [PATCH] kthread: Teach lockdep about kthread_flush_work() dependencies
config: s390-defconfig (https://download.01.org/0day-ci/archive/20261021/202610211757.UM0pu0Gh-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261021/202610211757.UM0pu0Gh-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/202610211757.UM0pu0Gh-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/vdpa/vdpa_sim/vdpa_sim.c:71:2: warning: unused variable '__work_key' [-Wunused-variable]
71 | kthread_init_work(work, vdpasim_mm_work_fn);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/kthread.h:219:32: note: expanded from macro 'kthread_init_work'
219 | static struct lock_class_key __work_key; \
| ^~~~~~~~~~
drivers/vdpa/vdpa_sim/vdpa_sim.c:234:2: warning: unused variable '__work_key' [-Wunused-variable]
234 | kthread_init_work(&vdpasim->work, vdpasim_work_fn);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/kthread.h:219:32: note: expanded from macro 'kthread_init_work'
219 | static struct lock_class_key __work_key; \
| ^~~~~~~~~~
2 warnings generated.
vim +/__work_key +71 drivers/vdpa/vdpa_sim/vdpa_sim.c
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 65
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 66 static void vdpasim_worker_change_mm_sync(struct vdpasim *vdpasim,
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 67 struct vdpasim_mm_work *mm_work)
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 68 {
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 69 struct kthread_work *work = &mm_work->work;
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 70
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 @71 kthread_init_work(work, vdpasim_mm_work_fn);
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 72 kthread_queue_work(vdpasim->worker, work);
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 73
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 74 kthread_flush_work(work);
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 75 }
4bb94d2de2fa90a Stefano Garzarella 2023-04-04 76
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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