Re: [Intel-gfx] [PATCH v2 6/7] drm/ttm: Reduce the number of used allocation orders for TTM pages

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

Hi Thomas,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on drm-intel/for-linux-next]
[cannot apply to drm-tip/drm-tip]
[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/Thomas-Hellstr-m/drm-ttm-Fix-a-NULL-pointer-dereference/20230307-224931
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20230307144621.10748-7-thomas.hellstrom%40linux.intel.com
patch subject: [Intel-gfx] [PATCH v2 6/7] drm/ttm: Reduce the number of used allocation orders for TTM pages
config: powerpc-randconfig-r006-20230306 (https://download.01.org/0day-ci/archive/20230308/202303080352.azyeWwwt-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/0eee47dba298051fc49965d56cb17dd113ff0236
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Thomas-Hellstr-m/drm-ttm-Fix-a-NULL-pointer-dereference/20230307-224931
        git checkout 0eee47dba298051fc49965d56cb17dd113ff0236
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/gpu/drm/ttm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303080352.azyeWwwt-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   In function 'ttm_pool_type_init',
       inlined from 'ttm_pool_init' at drivers/gpu/drm/ttm/ttm_pool.c:557:5:
>> drivers/gpu/drm/ttm/ttm_pool.c:264:18: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
     264 |         pt->pool = pool;
         |         ~~~~~~~~~^~~~~~
   drivers/gpu/drm/ttm/ttm_pool.c: In function 'ttm_pool_init':
   drivers/gpu/drm/ttm/ttm_pool.c:556:39: note: within this loop
     556 |                         for (j = 0; j < TTM_DIM_ORDER; ++j)
         |                                       ^
   In file included from <command-line>:
   drivers/gpu/drm/ttm/ttm_pool.c: In function 'ttm_pool_mgr_init':
>> include/linux/compiler_types.h:358:45: error: call to '__compiletime_assert_283' declared with attribute error: BUILD_BUG_ON failed: TTM_DIM_ORDER > MAX_ORDER
     358 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:339:25: note: in definition of macro '__compiletime_assert'
     339 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:358:9: note: in expansion of macro '_compiletime_assert'
     358 |         _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:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   drivers/gpu/drm/ttm/ttm_pool.c:744:9: note: in expansion of macro 'BUILD_BUG_ON'
     744 |         BUILD_BUG_ON(TTM_DIM_ORDER > MAX_ORDER);
         |         ^~~~~~~~~~~~


vim +/__compiletime_assert_283 +358 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  344  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  345  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  346  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  347  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  348  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  349   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  350   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  351   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  352   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  353   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  354   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  355   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  356   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  357  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @358  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  359  

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