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charset=us-ascii Content-Disposition: inline Hi Oleg, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 3f9f0252130e7dd60d41be0802bf58f6471c691d commit: 488f48b32654dc6be04d9cc12f75ce030c9cb21b seqlock: Change thread_group_cputime() to use scoped_seqlock_read() date: 6 weeks ago config: arm-mvebu_v5_defconfig (https://download.01.org/0day-ci/archive/20251203/202512032230.5pqkcg8x-lkp@intel.com/config) compiler: arm-linux-gnueabi-gcc (GCC) 15.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251203/202512032230.5pqkcg8x-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 | Closes: https://lore.kernel.org/oe-kbuild-all/202512032230.5pqkcg8x-lkp@intel.com/ All errors (new ones prefixed by >>): arm-linux-gnueabi-ld: kernel/sched/build_policy.o: in function `__scoped_seqlock_next': >> include/linux/seqlock.h:1257:(.text+0x96a0): 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 :::::: CC: Peter Zijlstra -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki