[PATCH bpf-next 1/5] net: checksum: move from32to16() to generic header
kernel test robot
lkp at intel.com
Tue Oct 22 06:50:28 PDT 2024
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@intel.com/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@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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410222149.3FVJFYYy-lkp@intel.com/
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
--
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