Re: [PATCH v4 drm-dp 1/5] drm/hisilicon/hibmc: add dp aux in hibmc

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

Hi Yongbang,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on drm-misc/drm-misc-next v6.12-rc7 next-20241112]
[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/Yongbang-Shi/drm-hisilicon-hibmc-add-dp-aux-in-hibmc/20241113-013224
base:   linus/master
patch link:    https://lore.kernel.org/r/20241112132348.2631150-2-shiyongbang%40huawei.com
patch subject: [PATCH v4 drm-dp 1/5] drm/hisilicon/hibmc: add dp aux in hibmc
config: x86_64-buildonly-randconfig-003-20241113 (https://download.01.org/0day-ci/archive/20241113/202411131438.RZWYrWTE-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241113/202411131438.RZWYrWTE-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/202411131438.RZWYrWTE-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c:9:
   In file included from drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h:14:
   In file included from include/drm/display/drm_dp_helper.h:27:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:21:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c:9:
>> drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h:31:11: warning: result of comparison of constant 18446744073709551615 with expression of type 'typeof (_Generic((mask), char: (unsigned char)0, unsigned char: (unsigned char)0, signed char: (unsigned char)0, unsigned short: (unsigned short)0, short: (unsigned short)0, unsigned int: (unsigned int)0, int: (unsigned int)0, unsigned long: (unsigned long)0, long: (unsigned long)0, unsigned long long: (unsigned long long)0, long long: (unsigned long long)0, default: (mask)))' (aka 'unsigned int') is always false [-Wtautological-constant-out-of-range-compare]
      31 |         value |= FIELD_PREP(mask, val);
         |                  ^~~~~~~~~~~~~~~~~~~~~
   include/linux/bitfield.h:115:3: note: expanded from macro 'FIELD_PREP'
     115 |                 __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: ");    \
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/bitfield.h:72:53: note: expanded from macro '__BF_FIELD_CHECK'
      72 |                 BUILD_BUG_ON_MSG(__bf_cast_unsigned(_mask, _mask) >     \
         |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
      73 |                                  __bf_cast_unsigned(_reg, ~0ull),       \
         |                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      74 |                                  _pfx "type of reg too small for mask"); \
         |                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
   include/linux/compiler_types.h:517:22: note: expanded from macro 'compiletime_assert'
     517 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:505:23: note: expanded from macro '_compiletime_assert'
     505 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:497:9: note: expanded from macro '__compiletime_assert'
     497 |                 if (!(condition))                                       \
         |                       ^~~~~~~~~
   2 warnings generated.


vim +31 drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h

    22	
    23	static inline void hibmc_dp_reg_write_field(struct hibmc_dp_dev *dp, u32 offset, u32 mask, u32 val)
    24	{
    25		u32 value;
    26	
    27		mutex_lock(&dp->lock);
    28	
    29		value = readl(dp->base + offset);
    30		value &= ~mask;
  > 31		value |= FIELD_PREP(mask, val);
    32		writel(value, dp->base + offset);
    33	
    34		mutex_unlock(&dp->lock);
    35	}
    36	

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