[tomoyo-test1:master 2/2] include/linux/compiler_types.h:352:45: error: call to '__compiletime_assert_302' declared with attribute error: Please avoid flushing system_long_wq.

[tomoyo-test1:master 2/2] include/linux/compiler_types.h:352:45: error: call to '__compiletime_assert_302' declared with attribute error: Please avoid flushing system_long_wq.

[kernel test robot]

tree:   https://scm.osdn.net/gitroot/tomoyo/tomoyo-test1.git master
head:   c806998d6e2cfdbcf8f4b241b709552b7d85fa3e
commit: c806998d6e2cfdbcf8f4b241b709552b7d85fa3e [2/2] workqueue: Wrap flush_workqueue() using a macro
config: x86_64-randconfig-a015 (https://download.01.org/0day-ci/archive/20220502/202205021411.imkBoPfj-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce (this is a W=1 build):
        git remote add tomoyo-test1 https://scm.osdn.net/gitroot/tomoyo/tomoyo-test1.git
        git fetch --no-tags tomoyo-test1 master
        git checkout c806998d6e2cfdbcf8f4b241b709552b7d85fa3e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

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 >>):

   In file included from <command-line>:
   In function 'rnbd_destroy_sessions',
       inlined from 'rnbd_client_exit' at drivers/block/rnbd/rnbd-clt.c:1801:2:
>> include/linux/compiler_types.h:352:45: error: call to '__compiletime_assert_302' declared with attribute error: Please avoid flushing system_long_wq.
     352 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:333:25: note: in definition of macro '__compiletime_assert'
     333 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:352:9: note: in expansion of macro '_compiletime_assert'
     352 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/workqueue.h:666:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     666 |         BUILD_BUG_ON_MSG(__builtin_constant_p(&(wq) == &system_long_wq) && \
         |         ^~~~~~~~~~~~~~~~
   drivers/block/rnbd/rnbd-clt.c:1769:9: note: in expansion of macro 'flush_workqueue'
    1769 |         flush_workqueue(system_long_wq);
         |         ^~~~~~~~~~~~~~~
--
   In file included from <command-line>:
   drivers/infiniband/core/device.c: In function 'ib_core_cleanup':
>> include/linux/compiler_types.h:352:45: error: call to '__compiletime_assert_514' declared with attribute error: Please avoid flushing system_unbound_wq.
     352 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:333:25: note: in definition of macro '__compiletime_assert'
     333 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:352:9: note: in expansion of macro '_compiletime_assert'
     352 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/workqueue.h:669:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     669 |         BUILD_BUG_ON_MSG(__builtin_constant_p(&(wq) == &system_unbound_wq) && \
         |         ^~~~~~~~~~~~~~~~
   drivers/infiniband/core/device.c:2857:9: note: in expansion of macro 'flush_workqueue'
    2857 |         flush_workqueue(system_unbound_wq);
         |         ^~~~~~~~~~~~~~~


vim +/__compiletime_assert_302 +352 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  338  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  339  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  340  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  341  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  342  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  343   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  344   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  345   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  346   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  347   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  348   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  349   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  350   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  351  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @352  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  353  

:::::: The code at line 352 was first introduced by commit
:::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h

:::::: TO: Will Deacon <will@kernel.org>
:::::: CC: Will Deacon <will@kernel.org>

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