[xilinx-xlnx:xlnx_rebase_v5.15_LTS 778/1181] drivers/media/platform/xilinx/xilinx-dprxss.c:521:12: warning: result of comparison of constant 18446744073709551615 with expression of type 'u32' (aka 'unsigned int') is always false

kernel test robot
2022-06-20T11:04:53Z

tree: https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.15_LTS
head: 59523b5c4aca0174f1f8cba2a07d3b3328b7c80e
commit: 1606e76a608339cc67dfd9b03542976482b90805 [778/1181] v4l: xilinx: Driver support for Xilinx DP Rx subsystem
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20220620/202206201904.c5yfGHoB-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project af6d2a0b6825e71965f3e2701a63c239fa0ad70f)
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/Xilinx/linux-xlnx/commit/1606e76a608339cc67dfd9b03542976482b90805
git remote add xilinx-xlnx https://github.com/Xilinx/linux-xlnx
git fetch --no-tags xilinx-xlnx xlnx_rebase_v5.15_LTS
git checkout 1606e76a608339cc67dfd9b03542976482b90805
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/media/i2c/ drivers/media/platform/xilinx/ drivers/phy/xilinx/ drivers/staging/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/media/platform/xilinx/xilinx-dprxss.c:521:12: warning: result of comparison of constant 18446744073709551615 with expression of type 'u32' (aka 'unsigned int') is always false [-Wtautological-constant-out-of-range-compare]
regval |= FIELD_PREP(clr_mask, set_data);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/bitfield.h:94:3: note: expanded from macro 'FIELD_PREP'
__BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: "); \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/bitfield.h:52:28: note: expanded from macro '__BF_FIELD_CHECK'
BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
include/linux/compiler_types.h:322:22: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:310:23: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:302:9: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^~~~~~~~~
>> drivers/media/platform/xilinx/xilinx-dprxss.c:1571:14: warning: overlapping comparisons always evaluate to false [-Wtautological-overlap-compare]
if (val < 1 && val > 4) {
~~~~~~~~^~~~~~~~~~
2 warnings generated.

vim +521 drivers/media/platform/xilinx/xilinx-dprxss.c

513
514 static void xdprxss_clrset(struct xdprxss_state *dp, u32 addr,
515 u32 clr_mask, u32 set_data)
516 {
517 u32 regval;
518
519 regval = xdprxss_read(dp, addr);
520 regval &= ~clr_mask;
> 521 regval |= FIELD_PREP(clr_mask, set_data);
522 xdprxss_write(dp, addr, regval);
523 }
524

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0-DAY CI Kernel Test Service