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X-CSE-ConnectionGUID: X0YKBIPATlGS6RfBAmiuLw== X-CSE-MsgGUID: ZPTBAJhhSJ6lLk/m1h17ZQ== X-IronPort-AV: E=McAfee;i="6800,10657,11685"; a="70851624" X-IronPort-AV: E=Sophos;i="6.21,260,1763452800"; d="scan'208";a="70851624" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jan 2026 17:32:56 -0800 X-CSE-ConnectionGUID: o3Mw/nb5TieBileOGFW3CQ== X-CSE-MsgGUID: IIlDaWuMRIenf4vNnFhRxA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,260,1763452800"; d="scan'208";a="231356543" Received: from lkp-server01.sh.intel.com (HELO 765f4a05e27f) ([10.239.97.150]) by fmviesa002.fm.intel.com with ESMTP; 28 Jan 2026 17:32:53 -0800 Received: from kbuild by 765f4a05e27f with local (Exim 4.98.2) (envelope-from ) id 1vlGtv-00000000axI-2ToZ; Thu, 29 Jan 2026 01:32:51 +0000 Date: Thu, 29 Jan 2026 09:32:00 +0800 From: kernel test robot To: Oleg Nesterov Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Peter Zijlstra Subject: include/linux/seqlock.h:1257:undefined reference to `__scoped_seqlock_bug' Message-ID: <202601290910.uwScjRjc-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 | 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 :::::: CC: Peter Zijlstra -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki