linux-kernel - include/linux/io-64-nonatomic-lo-hi.h:21:16: sparse: sparse: cast truncates bits from constant value (8000000000000000 becomes 0)

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Message-ID: <202311022232.mbDUzcRN-lkp@intel.com>
Date:   Thu, 2 Nov 2023 22:04:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Rander Wang <rander.wang@...el.com>,
        Péter Ujfalusi 
        <peter.ujfalusi@...ux.intel.com>
Subject: include/linux/io-64-nonatomic-lo-hi.h:21:16: sparse: sparse: cast
 truncates bits from constant value (8000000000000000 becomes 0)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   21e80f3841c01aeaf32d7aee7bbc87b3db1aa0c6
commit: 01278cb6fa82083000a9e0b56c8b004caf5b6a73 ASoC: SOF: ops: fallback to mmio in helpers
date:   1 year ago
config: nios2-randconfig-r132-20231102 (https://download.01.org/0day-ci/archive/20231102/202311022232.mbDUzcRN-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231102/202311022232.mbDUzcRN-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311022232.mbDUzcRN-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   sound/soc/sof/intel/atom.c: note: in included file (through include/sound/hdaudio.h, sound/soc/sof/intel/../sof-priv.h, sound/soc/sof/intel/../ops.h):
>> include/linux/io-64-nonatomic-lo-hi.h:21:16: sparse: sparse: cast truncates bits from constant value (8000000000000000 becomes 0)

vim +21 include/linux/io-64-nonatomic-lo-hi.h

797a796a13df6b include/asm-generic/io-64-nonatomic-lo-hi.h Hitoshi Mitake 2012-02-07  18  
3a044178cccfeb include/asm-generic/io-64-nonatomic-lo-hi.h Jason Baron    2014-07-04  19  static inline void lo_hi_writeq(__u64 val, volatile void __iomem *addr)
797a796a13df6b include/asm-generic/io-64-nonatomic-lo-hi.h Hitoshi Mitake 2012-02-07  20  {
797a796a13df6b include/asm-generic/io-64-nonatomic-lo-hi.h Hitoshi Mitake 2012-02-07 @21  	writel(val, addr);
797a796a13df6b include/asm-generic/io-64-nonatomic-lo-hi.h Hitoshi Mitake 2012-02-07  22  	writel(val >> 32, addr + 4);
797a796a13df6b include/asm-generic/io-64-nonatomic-lo-hi.h Hitoshi Mitake 2012-02-07  23  }
3a044178cccfeb include/asm-generic/io-64-nonatomic-lo-hi.h Jason Baron    2014-07-04  24  

:::::: The code at line 21 was first introduced by commit
:::::: 797a796a13df6b84a4791e57306737059b5b2384 asm-generic: architecture independent readq/writeq for 32bit environment

:::::: TO: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

-- 
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https://github.com/intel/lkp-tests/wiki