Re: [PATCH] drm: komeda: Fix an issue related to normalized zpos

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

Hi hongchi.peng,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on linus/master v6.11-rc4 next-20240822]
[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/hongchi-peng/drm-komeda-Fix-an-issue-related-to-normalized-zpos/20240822-045334
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20240821085613.5408-1-hongchi.peng%40siengine.com
patch subject: [PATCH] drm: komeda: Fix an issue related to normalized zpos
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20240822/202408222005.Pr9Vj8sj-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/20240822/202408222005.Pr9Vj8sj-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/202408222005.Pr9Vj8sj-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   drivers/gpu/drm/arm/display/komeda/komeda_kms.c: In function 'komeda_crtc_normalize_zpos':
>> include/linux/compiler_types.h:510:45: error: call to '__compiletime_assert_301' declared with attribute error: max(slave_zpos, kcrtc_st->max_slave_zorder) 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:136:25: note: in expansion of macro '__careful_cmp'
     136 | #define max(x, y)       __careful_cmp(max, x, y)
         |                         ^~~~~~~~~~~~~
   drivers/gpu/drm/arm/display/komeda/komeda_kms.c:207:33: note: in expansion of macro 'max'
     207 |                                 max(slave_zpos, kcrtc_st->max_slave_zorder);
         |                                 ^~~


vim +/__compiletime_assert_301 +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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