Re: [PATCH net 2/2] can: isotp: fix tx buffer concurrent access in isotp_sendmsg()

[kernel test robot]

Hi Ziyang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net/master]

url:    https://github.com/0day-ci/linux/commits/Ziyang-Xuan/fix-tx-buffer-concurrent-access-protection/20210929-161555
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git f936bb42aeb94a069bec7c9e04100d199c372956
config: riscv-allyesconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 11.2.0
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
        # https://github.com/0day-ci/linux/commit/95783210a32910b94c71ba6d13c3a027c02d49d9
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Ziyang-Xuan/fix-tx-buffer-concurrent-access-protection/20210929-161555
        git checkout 95783210a32910b94c71ba6d13c3a027c02d49d9
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   net/can/isotp.c: In function 'isotp_sendmsg':
>> include/linux/compiler_types.h:322:45: error: call to '__compiletime_assert_544' declared with attribute error: BUILD_BUG failed
     322 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:303:25: note: in definition of macro '__compiletime_assert'
     303 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:322:9: note: in expansion of macro '_compiletime_assert'
     322 |         _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/build_bug.h:59:21: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
         |                     ^~~~~~~~~~~~~~~~
   arch/riscv/include/asm/cmpxchg.h:335:17: note: in expansion of macro 'BUILD_BUG'
     335 |                 BUILD_BUG();                                            \
         |                 ^~~~~~~~~
   arch/riscv/include/asm/cmpxchg.h:344:30: note: in expansion of macro '__cmpxchg'
     344 |         (__typeof__(*(ptr))) __cmpxchg((ptr),                           \
         |                              ^~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1790:9: note: in expansion of macro 'arch_cmpxchg'
    1790 |         arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
         |         ^~~~~~~~~~~~
   net/can/isotp.c:864:13: note: in expansion of macro 'cmpxchg'
     864 |         if (cmpxchg(&so->tx.state, ISOTP_IDLE, ISOTP_SENDING) != ISOTP_IDLE ||
         |             ^~~~~~~


vim +/__compiletime_assert_544 +322 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  308  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  309  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  310  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  311  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  312  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  313   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  314   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  315   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  316   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  317   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  318   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  319   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  320   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  321  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @322  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  323  

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