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Message-ID: <202601290910.uwScjRjc-lkp@intel.com>
Date: Thu, 29 Jan 2026 09:32:00 +0800
From: kernel test robot <lkp@...el.com>
To: Oleg Nesterov <oleg@...hat.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>
Subject: include/linux/seqlock.h:1257:undefined reference to
`__scoped_seqlock_bug'
Hi Oleg,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8dfce8991b95d8625d0a1d2896e42f93b9d7f68d
commit: 488f48b32654dc6be04d9cc12f75ce030c9cb21b seqlock: Change thread_group_cputime() to use scoped_seqlock_read()
date: 3 months ago
config: s390-randconfig-002-20260129 (https://download.01.org/0day-ci/archive/20260129/202601290910.uwScjRjc-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260129/202601290910.uwScjRjc-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601290910.uwScjRjc-lkp@intel.com/
All errors (new ones prefixed by >>):
s390-linux-ld: kernel/sched/build_policy.o: in function `__scoped_seqlock_next':
>> include/linux/seqlock.h:1257:(.text+0x3ee04): undefined reference to `__scoped_seqlock_bug'
vim +1257 include/linux/seqlock.h
cc39f3872c0865 Peter Zijlstra 2025-10-09 1251
cc39f3872c0865 Peter Zijlstra 2025-10-09 1252 static inline void
cc39f3872c0865 Peter Zijlstra 2025-10-09 1253 __scoped_seqlock_next(struct ss_tmp *sst, seqlock_t *lock, enum ss_state target)
cc39f3872c0865 Peter Zijlstra 2025-10-09 1254 {
cc39f3872c0865 Peter Zijlstra 2025-10-09 1255 switch (sst->state) {
cc39f3872c0865 Peter Zijlstra 2025-10-09 1256 case ss_done:
cc39f3872c0865 Peter Zijlstra 2025-10-09 @1257 __scoped_seqlock_bug();
cc39f3872c0865 Peter Zijlstra 2025-10-09 1258 return;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1259
cc39f3872c0865 Peter Zijlstra 2025-10-09 1260 case ss_lock:
cc39f3872c0865 Peter Zijlstra 2025-10-09 1261 case ss_lock_irqsave:
cc39f3872c0865 Peter Zijlstra 2025-10-09 1262 sst->state = ss_done;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1263 return;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1264
cc39f3872c0865 Peter Zijlstra 2025-10-09 1265 case ss_lockless:
cc39f3872c0865 Peter Zijlstra 2025-10-09 1266 if (!read_seqretry(lock, sst->data)) {
cc39f3872c0865 Peter Zijlstra 2025-10-09 1267 sst->state = ss_done;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1268 return;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1269 }
cc39f3872c0865 Peter Zijlstra 2025-10-09 1270 break;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1271 }
cc39f3872c0865 Peter Zijlstra 2025-10-09 1272
cc39f3872c0865 Peter Zijlstra 2025-10-09 1273 switch (target) {
cc39f3872c0865 Peter Zijlstra 2025-10-09 1274 case ss_done:
cc39f3872c0865 Peter Zijlstra 2025-10-09 1275 __scoped_seqlock_invalid_target();
cc39f3872c0865 Peter Zijlstra 2025-10-09 1276 return;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1277
cc39f3872c0865 Peter Zijlstra 2025-10-09 1278 case ss_lock:
cc39f3872c0865 Peter Zijlstra 2025-10-09 1279 sst->lock = &lock->lock;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1280 spin_lock(sst->lock);
cc39f3872c0865 Peter Zijlstra 2025-10-09 1281 sst->state = ss_lock;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1282 return;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1283
cc39f3872c0865 Peter Zijlstra 2025-10-09 1284 case ss_lock_irqsave:
cc39f3872c0865 Peter Zijlstra 2025-10-09 1285 sst->lock_irqsave = &lock->lock;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1286 spin_lock_irqsave(sst->lock_irqsave, sst->data);
cc39f3872c0865 Peter Zijlstra 2025-10-09 1287 sst->state = ss_lock_irqsave;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1288 return;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1289
cc39f3872c0865 Peter Zijlstra 2025-10-09 1290 case ss_lockless:
cc39f3872c0865 Peter Zijlstra 2025-10-09 1291 sst->data = read_seqbegin(lock);
cc39f3872c0865 Peter Zijlstra 2025-10-09 1292 return;
cc39f3872c0865 Peter Zijlstra 2025-10-09 1293 }
cc39f3872c0865 Peter Zijlstra 2025-10-09 1294 }
cc39f3872c0865 Peter Zijlstra 2025-10-09 1295
:::::: The code at line 1257 was first introduced by commit
:::::: cc39f3872c0865bef992b713338df369554fa9e0 seqlock: Introduce scoped_seqlock_read()
:::::: TO: Peter Zijlstra <peterz@...radead.org>
:::::: CC: Peter Zijlstra <peterz@...radead.org>
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