drivers/infiniband/core/device.c:2857:2: error: call to __compiletime_assert_526 declared with 'error' attribute: Please avoid flushing system_unbound_wq.

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

tree:   https://github.com/intel-lab-lkp/linux/commits/UPDATE-20220516-130223/Tetsuo-Handa/checkpatch-warn-about-flushing-system-wide-workqueues/20220425-073327
head:   db9b183910399bd93ea36329bfef7228a09c96ec
commit: db9b183910399bd93ea36329bfef7228a09c96ec workqueue: Wrap flush_workqueue() using a macro
date:   14 hours ago
config: mips-randconfig-r026-20220516 (https://download.01.org/0day-ci/archive/20220517/202205170247.XQQJv8KQ-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 853fa8ee225edf2d0de94b0dcbd31bea916e825e)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/db9b183910399bd93ea36329bfef7228a09c96ec
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review UPDATE-20220516-130223/Tetsuo-Handa/checkpatch-warn-about-flushing-system-wide-workqueues/20220425-073327
        git checkout db9b183910399bd93ea36329bfef7228a09c96ec
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/infiniband/core/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/infiniband/core/device.c:2857:2: error: call to __compiletime_assert_526 declared with 'error' attribute: Please avoid flushing system_unbound_wq.
           flush_workqueue(system_unbound_wq);
           ^
   include/linux/workqueue.h:682:2: note: expanded from macro 'flush_workqueue'
           BUILD_BUG_ON_MSG(__builtin_constant_p(&(wq) == &system_unbound_wq) && \
           ^
   include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
   #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                       ^
   include/linux/compiler_types.h:352:2: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
           ^
   include/linux/compiler_types.h:340:2: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
           ^
   include/linux/compiler_types.h:333:4: note: expanded from macro '__compiletime_assert'
                           prefix ## suffix();                             \
                           ^
   <scratch space>:150:1: note: expanded from here
   __compiletime_assert_526
   ^
   1 error generated.


vim +/error +2857 drivers/infiniband/core/device.c

^1da177e4c3f41 Linus Torvalds    2005-04-16  2840  
^1da177e4c3f41 Linus Torvalds    2005-04-16  2841  static void __exit ib_core_cleanup(void)
^1da177e4c3f41 Linus Torvalds    2005-04-16  2842  {
5ef8c0c180a631 Jason Gunthorpe   2018-05-28  2843  	roce_gid_mgmt_cleanup();
6c80b41abe22ae Leon Romanovsky   2017-06-20  2844  	nldev_exit();
c9901724a2f141 Leon Romanovsky   2017-06-05  2845  	rdma_nl_unregister(RDMA_NL_LS);
4e0f7b9070726a Parav Pandit      2019-02-26  2846  	unregister_pernet_device(&rdma_dev_net_ops);
42df744c4166af Janne Karhunen    2019-06-14  2847  	unregister_blocking_lsm_notifier(&ibdev_lsm_nb);
c2e49c92326f9b Mark Bloch        2016-05-19  2848  	ib_sa_cleanup();
4c2cb4220431cb Mark Bloch        2016-05-19  2849  	ib_mad_cleanup();
e3f20f02864f6d Leon Romanovsky   2016-05-19  2850  	addr_cleanup();
c9901724a2f141 Leon Romanovsky   2017-06-05  2851  	rdma_nl_exit();
55aeed06544f67 Jason Gunthorpe   2015-08-04  2852  	class_unregister(&ib_class);
f794809a7259df Jack Morgenstein  2018-08-27  2853  	destroy_workqueue(ib_comp_unbound_wq);
14d3a3b2498eda Christoph Hellwig 2015-12-11  2854  	destroy_workqueue(ib_comp_wq);
f7c6a7b5d59980 Roland Dreier     2007-03-04  2855  	/* Make sure that any pending umem accounting work is done. */
f06267104dd911 Tejun Heo         2010-10-19  2856  	destroy_workqueue(ib_wq);
d0899892edd089 Jason Gunthorpe   2019-02-12 @2857  	flush_workqueue(system_unbound_wq);
e59178d895afa2 Jason Gunthorpe   2019-02-06  2858  	WARN_ON(!xa_empty(&clients));
0df91bb67334ee Jason Gunthorpe   2019-02-06  2859  	WARN_ON(!xa_empty(&devices));
^1da177e4c3f41 Linus Torvalds    2005-04-16  2860  }
^1da177e4c3f41 Linus Torvalds    2005-04-16  2861  

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