* Re: [PATCH v2 net-next 7/7] net-sysfs: use rps_tag_ptr and remove metadata from rps_dev_flow_table
[not found] <20260301181457.3539105-8-edumazet@google.com>
@ 2026-03-01 23:38 ` kernel test robot
2026-03-02 6:02 ` Eric Dumazet
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2026-03-01 23:38 UTC (permalink / raw)
To: Eric Dumazet, David S . Miller, Jakub Kicinski, Paolo Abeni
Cc: llvm, oe-kbuild-all, Simon Horman, Kuniyuki Iwashima, netdev,
eric.dumazet, Eric Dumazet
Hi Eric,
kernel test robot noticed the following build errors:
[auto build test ERROR on net-next/main]
url: https://github.com/intel-lab-lkp/linux/commits/Eric-Dumazet/net-add-rps_tag_ptr-type-and-helpers/20260302-021900
base: net-next/main
patch link: https://lore.kernel.org/r/20260301181457.3539105-8-edumazet%40google.com
patch subject: [PATCH v2 net-next 7/7] net-sysfs: use rps_tag_ptr and remove metadata from rps_dev_flow_table
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20260302/202603020743.NEL0agrx-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260302/202603020743.NEL0agrx-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603020743.NEL0agrx-lkp@intel.com/
All errors (new ones prefixed by >>):
>> net/core/net-sysfs.c:1104:27: error: call to undeclared function 'RPS_DEV_FLOW_TABLE_SIZE'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1104 | if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
| ^
1 error generated.
vim +/RPS_DEV_FLOW_TABLE_SIZE +1104 net/core/net-sysfs.c
fec5e652e58fa60 Tom Herbert 2010-04-16 1072
f5acb907dc24c38 Eric Dumazet 2010-04-19 1073 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
fec5e652e58fa60 Tom Herbert 2010-04-16 1074 const char *buf, size_t len)
fec5e652e58fa60 Tom Herbert 2010-04-16 1075 {
5b629854b594cdb Eric Dumazet 2026-03-01 1076 struct rps_dev_flow *table;
5b629854b594cdb Eric Dumazet 2026-03-01 1077 rps_tag_ptr otag, tag_ptr = 0UL;
60b778ce5196251 Eric Dumazet 2011-12-24 1078 unsigned long mask, count;
5b629854b594cdb Eric Dumazet 2026-03-01 1079 size_t sz;
60b778ce5196251 Eric Dumazet 2011-12-24 1080 int rc;
fec5e652e58fa60 Tom Herbert 2010-04-16 1081
fec5e652e58fa60 Tom Herbert 2010-04-16 1082 if (!capable(CAP_NET_ADMIN))
fec5e652e58fa60 Tom Herbert 2010-04-16 1083 return -EPERM;
fec5e652e58fa60 Tom Herbert 2010-04-16 1084
60b778ce5196251 Eric Dumazet 2011-12-24 1085 rc = kstrtoul(buf, 0, &count);
60b778ce5196251 Eric Dumazet 2011-12-24 1086 if (rc < 0)
60b778ce5196251 Eric Dumazet 2011-12-24 1087 return rc;
fec5e652e58fa60 Tom Herbert 2010-04-16 1088
fec5e652e58fa60 Tom Herbert 2010-04-16 1089 if (count) {
60b778ce5196251 Eric Dumazet 2011-12-24 1090 mask = count - 1;
60b778ce5196251 Eric Dumazet 2011-12-24 1091 /* mask = roundup_pow_of_two(count) - 1;
60b778ce5196251 Eric Dumazet 2011-12-24 1092 * without overflows...
60b778ce5196251 Eric Dumazet 2011-12-24 1093 */
60b778ce5196251 Eric Dumazet 2011-12-24 1094 while ((mask | (mask >> 1)) != mask)
60b778ce5196251 Eric Dumazet 2011-12-24 1095 mask |= (mask >> 1);
60b778ce5196251 Eric Dumazet 2011-12-24 1096 /* On 64 bit arches, must check mask fits in table->mask (u32),
8e3bff96afa6736 stephen hemminger 2013-12-08 1097 * and on 32bit arches, must check
8e3bff96afa6736 stephen hemminger 2013-12-08 1098 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
60b778ce5196251 Eric Dumazet 2011-12-24 1099 */
60b778ce5196251 Eric Dumazet 2011-12-24 1100 #if BITS_PER_LONG > 32
60b778ce5196251 Eric Dumazet 2011-12-24 1101 if (mask > (unsigned long)(u32)mask)
a0a129f8b6cff54 Xi Wang 2011-12-22 1102 return -EINVAL;
60b778ce5196251 Eric Dumazet 2011-12-24 1103 #else
60b778ce5196251 Eric Dumazet 2011-12-24 @1104 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
a0a129f8b6cff54 Xi Wang 2011-12-22 1105 / sizeof(struct rps_dev_flow)) {
fec5e652e58fa60 Tom Herbert 2010-04-16 1106 /* Enforce a limit to prevent overflow */
fec5e652e58fa60 Tom Herbert 2010-04-16 1107 return -EINVAL;
fec5e652e58fa60 Tom Herbert 2010-04-16 1108 }
60b778ce5196251 Eric Dumazet 2011-12-24 1109 #endif
5b629854b594cdb Eric Dumazet 2026-03-01 1110 sz = max_t(size_t, sizeof(*table) * (mask + 1),
5b629854b594cdb Eric Dumazet 2026-03-01 1111 PAGE_SIZE);
5b629854b594cdb Eric Dumazet 2026-03-01 1112 if (sz <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER) ||
5b629854b594cdb Eric Dumazet 2026-03-01 1113 is_power_of_2(sz))
5b629854b594cdb Eric Dumazet 2026-03-01 1114 table = kvmalloc(sz, GFP_KERNEL);
5b629854b594cdb Eric Dumazet 2026-03-01 1115 else
5b629854b594cdb Eric Dumazet 2026-03-01 1116 table = vmalloc(sz);
fec5e652e58fa60 Tom Herbert 2010-04-16 1117 if (!table)
fec5e652e58fa60 Tom Herbert 2010-04-16 1118 return -ENOMEM;
5b629854b594cdb Eric Dumazet 2026-03-01 1119 tag_ptr = (rps_tag_ptr)table;
5b629854b594cdb Eric Dumazet 2026-03-01 1120 if (rps_tag_to_log(tag_ptr)) {
5b629854b594cdb Eric Dumazet 2026-03-01 1121 pr_err_once("store_rps_dev_flow_table_cnt() got a non page aligned allocation.\n");
5b629854b594cdb Eric Dumazet 2026-03-01 1122 kvfree(table);
5b629854b594cdb Eric Dumazet 2026-03-01 1123 return -ENOMEM;
5b629854b594cdb Eric Dumazet 2026-03-01 1124 }
5b629854b594cdb Eric Dumazet 2026-03-01 1125 tag_ptr |= (ilog2(mask) + 1);
97bcc5b6f45425a Krishna Kumar 2025-08-25 1126 for (count = 0; count <= mask; count++) {
5b629854b594cdb Eric Dumazet 2026-03-01 1127 table[count].cpu = RPS_NO_CPU;
5b629854b594cdb Eric Dumazet 2026-03-01 1128 table[count].filter = RPS_NO_FILTER;
97bcc5b6f45425a Krishna Kumar 2025-08-25 1129 }
6648c65e7ea72c3 stephen hemminger 2017-08-18 1130 }
fec5e652e58fa60 Tom Herbert 2010-04-16 1131
5b629854b594cdb Eric Dumazet 2026-03-01 1132 otag = xchg(&queue->rps_flow_table, tag_ptr);
5b629854b594cdb Eric Dumazet 2026-03-01 1133 if (otag)
5b629854b594cdb Eric Dumazet 2026-03-01 1134 kvfree_rcu_mightsleep(rps_tag_to_table(otag));
fec5e652e58fa60 Tom Herbert 2010-04-16 1135
fec5e652e58fa60 Tom Herbert 2010-04-16 1136 return len;
fec5e652e58fa60 Tom Herbert 2010-04-16 1137 }
fec5e652e58fa60 Tom Herbert 2010-04-16 1138
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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