Subject: Re: [PATCH net-next v2 4/7] net: openvswitch: fix load tearing with u64_stats

From: kernel test robot <[email-masked]>
Date: Sat, 24 Jan 2026 08:49:23 +0800

Hi David,

kernel test robot noticed the following build errors:

[auto build test ERROR on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Yang/u64_stats-Doc-incorrect-usage-with-plain-variables/20260124-012240
base:   net-next/main
patch link:    https://lore.kernel.org/r/20260123162159.2877941-5-mmyangfl%40gmail.com
patch subject: [PATCH net-next v2 4/7] net: openvswitch: fix load tearing with u64_stats
config: m68k-randconfig-r073-20260124 (https://download.01.org/0day-ci/archive/20260124/[email-masked]/config)
compiler: m68k-linux-gcc (GCC) 8.5.0
smatch version: v0.5.0-8994-gd50c5a4c
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260124/[email-masked]/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 <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   In function 'u64_stats_reads.constprop',
       inlined from 'get_dp_stats' at net/openvswitch/datapath.c:773:4:
>> include/linux/compiler_types.h:631:38: error: call to '__compiletime_assert_333' declared with attribute error: BUILD_BUG_ON failed: len % sizeof(u64_stats_t)
     _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                                         ^
   include/linux/compiler_types.h:612:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler_types.h:631:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
     ^~~~~~~~~~~~~~~~
   include/linux/u64_stats_sync.h:157:2: note: in expansion of macro 'BUILD_BUG_ON'
     BUILD_BUG_ON(len % sizeof(u64_stats_t));
     ^~~~~~~~~~~~

vim +/__compiletime_assert_333 +631 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  617  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  618  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  619  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  620  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  621  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  622   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  623   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  624   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  625   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  626   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  627   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  628   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  629   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  630  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @631  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  632  

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