[tip:x86/core 1/1] arch/x86/um/../lib/csum-partial_64.c:98:12: error: implicit declaration of function 'load_unaligned_zeropad'

From: kernel test robot
Date: Wed Nov 17 2021 - 13:46:31 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/core
head: d31c3c683ee668ba5d87c0730610442fd672525f
commit: d31c3c683ee668ba5d87c0730610442fd672525f [1/1] x86/csum: Rewrite/optimize csum_partial()
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=d31c3c683ee668ba5d87c0730610442fd672525f
git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
git fetch --no-tags tip x86/core
git checkout d31c3c683ee668ba5d87c0730610442fd672525f
# save the attached .config to linux build tree
make W=1 ARCH=um SUBARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

arch/x86/um/../lib/csum-partial_64.c: In function 'csum_partial':
>> arch/x86/um/../lib/csum-partial_64.c:98:12: error: implicit declaration of function 'load_unaligned_zeropad' [-Werror=implicit-function-declaration]
98 | trail = (load_unaligned_zeropad(buff) << shift) >> shift;
| ^~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors


vim +/load_unaligned_zeropad +98 arch/x86/um/../lib/csum-partial_64.c

23
24 /*
25 * Do a checksum on an arbitrary memory area.
26 * Returns a 32bit checksum.
27 *
28 * This isn't as time critical as it used to be because many NICs
29 * do hardware checksumming these days.
30 *
31 * Still, with CHECKSUM_COMPLETE this is called to compute
32 * checksums on IPv6 headers (40 bytes) and other small parts.
33 * it's best to have buff aligned on a 64-bit boundary
34 */
35 __wsum csum_partial(const void *buff, int len, __wsum sum)
36 {
37 u64 temp64 = (__force u64)sum;
38 unsigned odd, result;
39
40 odd = 1 & (unsigned long) buff;
41 if (unlikely(odd)) {
42 if (unlikely(len == 0))
43 return sum;
44 temp64 += (*(unsigned char *)buff << 8);
45 len--;
46 buff++;
47 }
48
49 while (unlikely(len >= 64)) {
50 asm("addq 0*8(%[src]),%[res]\n\t"
51 "adcq 1*8(%[src]),%[res]\n\t"
52 "adcq 2*8(%[src]),%[res]\n\t"
53 "adcq 3*8(%[src]),%[res]\n\t"
54 "adcq 4*8(%[src]),%[res]\n\t"
55 "adcq 5*8(%[src]),%[res]\n\t"
56 "adcq 6*8(%[src]),%[res]\n\t"
57 "adcq 7*8(%[src]),%[res]\n\t"
58 "adcq $0,%[res]"
59 : [res] "+r" (temp64)
60 : [src] "r" (buff)
61 : "memory");
62 buff += 64;
63 len -= 64;
64 }
65
66 if (len & 32) {
67 asm("addq 0*8(%[src]),%[res]\n\t"
68 "adcq 1*8(%[src]),%[res]\n\t"
69 "adcq 2*8(%[src]),%[res]\n\t"
70 "adcq 3*8(%[src]),%[res]\n\t"
71 "adcq $0,%[res]"
72 : [res] "+r" (temp64)
73 : [src] "r" (buff)
74 : "memory");
75 buff += 32;
76 }
77 if (len & 16) {
78 asm("addq 0*8(%[src]),%[res]\n\t"
79 "adcq 1*8(%[src]),%[res]\n\t"
80 "adcq $0,%[res]"
81 : [res] "+r" (temp64)
82 : [src] "r" (buff)
83 : "memory");
84 buff += 16;
85 }
86 if (len & 8) {
87 asm("addq 0*8(%[src]),%[res]\n\t"
88 "adcq $0,%[res]"
89 : [res] "+r" (temp64)
90 : [src] "r" (buff)
91 : "memory");
92 buff += 8;
93 }
94 if (len & 7) {
95 unsigned int shift = (8 - (len & 7)) * 8;
96 unsigned long trail;
97
> 98 trail = (load_unaligned_zeropad(buff) << shift) >> shift;
99
100 asm("addq %[trail],%[res]\n\t"
101 "adcq $0,%[res]"
102 : [res] "+r" (temp64)
103 : [trail] "r" (trail));
104 }
105 result = add32_with_carry(temp64 >> 32, temp64 & 0xffffffff);
106 if (unlikely(odd)) {
107 result = from32to16(result);
108 result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
109 }
110 return (__force __wsum)result;
111 }
112 EXPORT_SYMBOL(csum_partial);
113

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Attachment: .config.gz
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