Hi Puranjay, kernel test robot noticed the following build warnings: [auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Puranjay-Mohan/net-checksum-move-from32to16-to-generic-header/20241021-202707 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20241021122112.101513-2-puranjay%40kernel.org patch subject: [PATCH bpf-next 1/5] net: checksum: move from32to16() to generic header config: x86_64-randconfig-122-20241022 (https://download.01.org/0day-ci/archive/20241022/202410222149.3FVJFYYy-lkp@xxxxxxxxx/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/20241022/202410222149.3FVJFYYy-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 | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202410222149.3FVJFYYy-lkp@xxxxxxxxx/ sparse warnings: (new ones prefixed by >>) >> lib/checksum.c:84:34: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected restricted __wsum [usertype] sum @@ got unsigned int [assigned] result @@ lib/checksum.c:84:34: sparse: expected restricted __wsum [usertype] sum lib/checksum.c:84:34: sparse: got unsigned int [assigned] result >> lib/checksum.c:84:16: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [assigned] result @@ got restricted __sum16 @@ lib/checksum.c:84:16: sparse: expected unsigned int [assigned] result lib/checksum.c:84:16: sparse: got restricted __sum16 vim +84 lib/checksum.c 35 36 #ifndef do_csum 37 static unsigned int do_csum(const unsigned char *buff, int len) 38 { 39 int odd; 40 unsigned int result = 0; 41 42 if (len <= 0) 43 goto out; 44 odd = 1 & (unsigned long) buff; 45 if (odd) { 46 #ifdef __LITTLE_ENDIAN 47 result += (*buff << 8); 48 #else 49 result = *buff; 50 #endif 51 len--; 52 buff++; 53 } 54 if (len >= 2) { 55 if (2 & (unsigned long) buff) { 56 result += *(unsigned short *) buff; 57 len -= 2; 58 buff += 2; 59 } 60 if (len >= 4) { 61 const unsigned char *end = buff + ((unsigned)len & ~3); 62 unsigned int carry = 0; 63 do { 64 unsigned int w = *(unsigned int *) buff; 65 buff += 4; 66 result += carry; 67 result += w; 68 carry = (w > result); 69 } while (buff < end); 70 result += carry; 71 result = (result & 0xffff) + (result >> 16); 72 } 73 if (len & 2) { 74 result += *(unsigned short *) buff; 75 buff += 2; 76 } 77 } 78 if (len & 1) 79 #ifdef __LITTLE_ENDIAN 80 result += *buff; 81 #else 82 result += (*buff << 8); 83 #endif > 84 result = csum_from32to16(result); 85 if (odd) 86 result = ((result >> 8) & 0xff) | ((result & 0xff) << 8); 87 out: 88 return result; 89 } 90 #endif 91 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
