linux-kernel - [phy:next 136/164] drivers/phy/mediatek/phy-mtk-io.h:42:33: 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 shor...

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Date:   Sat, 24 Sep 2022 21:22:35 +0800
From:   kernel test robot <lkp@...el.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Vinod Koul <vkoul@...nel.org>, Kishon <kishon@...com>,
        linux-kernel@...r.kernel.org
Subject: [phy:next 136/164] drivers/phy/mediatek/phy-mtk-io.h:42:33: 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 shor...

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy.git next
head:   add7000bdd438c4195095dca7bff6877d54d06f4
commit: 29c07477556eb68a64f0ff53235feb0bd1cf1f63 [136/164] phy: mediatek: add a new helper to update bitfield
config: arm-buildonly-randconfig-r004-20220923
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy.git/commit/?id=29c07477556eb68a64f0ff53235feb0bd1cf1f63
        git remote add phy https://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy.git
        git fetch --no-tags phy next
        git checkout 29c07477556eb68a64f0ff53235feb0bd1cf1f63
        # 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=arm SHELL=/bin/bash drivers/phy/

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

All warnings (new ones prefixed by >>):

   In file included from drivers/phy/mediatek/phy-mtk-pcie.c:15:
>> drivers/phy/mediatek/phy-mtk-io.h:42:33: 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]
           mtk_phy_update_bits(reg, mask, FIELD_PREP(mask, val));
                                          ^~~~~~~~~~~~~~~~~~~~~
   include/linux/bitfield.h:114:3: note: expanded from macro 'FIELD_PREP'
                   __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: ");    \
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/bitfield.h:71:53: note: expanded from macro '__BF_FIELD_CHECK'
                   BUILD_BUG_ON_MSG(__bf_cast_unsigned(_mask, _mask) >     \
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
   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:354:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
           ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:342:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:334:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
   1 warning generated.


vim +42 drivers/phy/mediatek/phy-mtk-io.h

    38	
    39	/* field @mask should be constant and continuous */
    40	static inline void mtk_phy_update_field(void __iomem *reg, u32 mask, u32 val)
    41	{
  > 42		mtk_phy_update_bits(reg, mask, FIELD_PREP(mask, val));
    43	}
    44	

-- 
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