Re: [PATCH] Bluetooth: Fix type of len in rfcomm_sock_{bind,getsockopt_old}()

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

Hi Andrej,

kernel test robot noticed the following build errors:

[auto build test ERROR on bluetooth-next/master]
[also build test ERROR on bluetooth/master linus/master v6.12-rc1 next-20241004]
[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/Andrej-Shadura/Bluetooth-Fix-type-of-len-in-rfcomm_sock_-bind-getsockopt_old/20241002-221656
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master
patch link:    https://lore.kernel.org/r/20241002141217.663070-1-andrew.shadura%40collabora.co.uk
patch subject: [PATCH] Bluetooth: Fix type of len in rfcomm_sock_{bind,getsockopt_old}()
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20241004/202410041637.iOIxEAQQ-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241004/202410041637.iOIxEAQQ-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/202410041637.iOIxEAQQ-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   net/bluetooth/rfcomm/sock.c: In function 'rfcomm_sock_bind':
>> include/linux/compiler_types.h:510:45: error: call to '__compiletime_assert_602' declared with attribute error: min(sizeof(sa), addr_len) signedness error
     510 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:491:25: note: in definition of macro '__compiletime_assert'
     491 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:510:9: note: in expansion of macro '_compiletime_assert'
     510 |         _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/minmax.h:100:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     100 |         BUILD_BUG_ON_MSG(!__types_ok(x,y,ux,uy),        \
         |         ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:105:9: note: in expansion of macro '__careful_cmp_once'
     105 |         __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
         |         ^~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:129:25: note: in expansion of macro '__careful_cmp'
     129 | #define min(x, y)       __careful_cmp(min, x, y)
         |                         ^~~~~~~~~~~~~
   net/bluetooth/rfcomm/sock.c:339:15: note: in expansion of macro 'min'
     339 |         len = min(sizeof(sa), addr_len);
         |               ^~~


vim +/__compiletime_assert_602 +510 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  496  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  497  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  498  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  499  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  500  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  501   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  502   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  503   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  504   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  505   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  506   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  507   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  508   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  509  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @510  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  511  

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