arch/nios2/include/asm/checksum.h:30:24: sparse: sparse: restricted __wsum degrades to integer

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9716c086c8e8b141d35aa61f2e96a2e83de212a7
commit: 203247c5cb972af5d46bdb7d41ef40078048810b blk-integrity: support arbitrary buffer alignment
date:   3 months ago
config: nios2-randconfig-r134-20260611 (https://download.01.org/0day-ci/archive/20260611/202606111818.O5tEL43L-lkp@xxxxxxxxx/config)
compiler: nios2-linux-gcc (GCC) 8.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260611/202606111818.O5tEL43L-lkp@xxxxxxxxx/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
| Fixes: 203247c5cb97 ("blk-integrity: support arbitrary buffer alignment")
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606111818.O5tEL43L-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
   block/t10-pi.c: note: in included file (through include/net/checksum.h):
>> arch/nios2/include/asm/checksum.h:30:24: sparse: sparse: restricted __wsum degrades to integer

vim +30 arch/nios2/include/asm/checksum.h

eea9507a69d637d Ley Foon Tan 2014-11-06  17  
eea9507a69d637d Ley Foon Tan 2014-11-06  18  /*
eea9507a69d637d Ley Foon Tan 2014-11-06  19   * Fold a partial checksum
eea9507a69d637d Ley Foon Tan 2014-11-06  20   */
eea9507a69d637d Ley Foon Tan 2014-11-06  21  static inline __sum16 csum_fold(__wsum sum)
eea9507a69d637d Ley Foon Tan 2014-11-06  22  {
eea9507a69d637d Ley Foon Tan 2014-11-06  23  	__asm__ __volatile__(
eea9507a69d637d Ley Foon Tan 2014-11-06  24  		"add	%0, %1, %0\n"
eea9507a69d637d Ley Foon Tan 2014-11-06  25  		"cmpltu	r8, %0, %1\n"
eea9507a69d637d Ley Foon Tan 2014-11-06  26  		"srli	%0, %0, 16\n"
eea9507a69d637d Ley Foon Tan 2014-11-06  27  		"add	%0, %0, r8\n"
eea9507a69d637d Ley Foon Tan 2014-11-06  28  		"nor	%0, %0, %0\n"
eea9507a69d637d Ley Foon Tan 2014-11-06  29  		: "=r" (sum)
eea9507a69d637d Ley Foon Tan 2014-11-06 @30  		: "r" (sum << 16), "0" (sum)
eea9507a69d637d Ley Foon Tan 2014-11-06  31  		: "r8");
eea9507a69d637d Ley Foon Tan 2014-11-06  32  	return (__force __sum16) sum;
eea9507a69d637d Ley Foon Tan 2014-11-06  33  }
eea9507a69d637d Ley Foon Tan 2014-11-06  34  

:::::: The code at line 30 was first introduced by commit
:::::: eea9507a69d637d52705de8703b168bf6bfe5643 nios2: Library functions

:::::: TO: Ley Foon Tan <lftan@xxxxxxxxxx>
:::::: CC: Ley Foon Tan <lftan@xxxxxxxxxx>

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