2023-11-17 08:58:13

by Yujie Liu

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Subject: include/asm-generic/unaligned.h:119:16: sparse: sparse: cast truncates bits from constant value (aa01a0 becomes a0)

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c42d9eeef8e5ba9292eda36fd8e3c11f35ee065c
commit: 66603243f5283f7f28c795f09e7c2167233df0bd Input: add driver for Hynitron cstxxx touchscreens
config: x86_64-randconfig-x001-20230717 (https://download.01.org/0day-ci/archive/20231116/[email protected]/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231116/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

sparse warnings: (new ones prefixed by >>)
drivers/input/touchscreen/hynitron_cstxxx.c: note: in included file (through arch/x86/include/generated/asm/unaligned.h):
>> include/asm-generic/unaligned.h:119:16: sparse: sparse: cast truncates bits from constant value (aa01a0 becomes a0)
include/asm-generic/unaligned.h:120:20: sparse: sparse: cast truncates bits from constant value (aa01 becomes 1)
>> include/asm-generic/unaligned.h:119:16: sparse: sparse: cast truncates bits from constant value (ab00d0 becomes d0)
include/asm-generic/unaligned.h:120:20: sparse: sparse: cast truncates bits from constant value (ab00 becomes 0)

vim +119 include/asm-generic/unaligned.h

803f4e1eab7a89 Arnd Bergmann 2021-05-08 116
803f4e1eab7a89 Arnd Bergmann 2021-05-08 117 static inline void __put_unaligned_le24(const u32 val, u8 *p)
803f4e1eab7a89 Arnd Bergmann 2021-05-08 118 {
803f4e1eab7a89 Arnd Bergmann 2021-05-08 @119 *p++ = val;
803f4e1eab7a89 Arnd Bergmann 2021-05-08 120 *p++ = val >> 8;
803f4e1eab7a89 Arnd Bergmann 2021-05-08 121 *p++ = val >> 16;
803f4e1eab7a89 Arnd Bergmann 2021-05-08 122 }
803f4e1eab7a89 Arnd Bergmann 2021-05-08 123

:::::: The code at line 119 was first introduced by commit
:::::: 803f4e1eab7a8938ba3a3c30dd4eb5e9eeef5e63 asm-generic: simplify asm/unaligned.h

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