From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2C7CE1DE4E1; Thu, 4 Dec 2025 08:19:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764836374; cv=none; b=qTCPpekMV733Kh5aHbPbGkAdhVUzpB8wtT239sOKNG6nOS9E71Y9dVnQcITaA6b58BzoSRJPcP9QVOybMjjdr28twglOfwN+O8KHfzVoLPpSVD3qovMX26i3IS5IYkVPg90BS6PCGWM5EllndRyuZErcSpCl8+fznSa1gLX3jRI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764836374; c=relaxed/simple; bh=F4MOGEBbJx/awVa2QOmQ8xIPGzE0XjtbB1nvvmmyLd8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=LLSTy7AbTO49SKeRDu3MX7/5E1yEc7JHkrC96cU1djnnS4qe90m1gFctSCx+pzM4C7O01Yw3qw5UnmxlWtva5hNLEMpbd8q3uJTMMvzyl98VQ+tjS54l/4Q3Le8eYBUCnCSSKsfbGBcurjmXton1x/7gQZaRH3/hUfV/7YX5IlA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=B9oNiX6p; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="B9oNiX6p" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=TrffoYNSG+1mpO4I719udc0KZUrd2KhSrNvEZFdxZ4M=; b=B9oNiX6paT3xv8r39g1qQNvoV5 c4Pdvx9NcvYdAiGlRv2MOMu61zrMLFbCtXrq2dTeewuvs6+mZwfUuXnX3hvcoe2yBHx1Mo0jRJz2f ysWA8siVxI3BOMHLmEpbIr3EDoTdLPeRoq8TQItKnWymlRtp83v1gucseF3GNlxmiDJTM9imy7p1z GTqe9s/QXXV4vw3mE6jeW4dsZksCu0pbG/gf4+uWrCHME837ouoXqbEPEQqi/0n6gnVjSsEng53Xi UGdPPXW62cdPF58oFGVazmBf40c6uV/+qNtQ+9QYy1k03hoOCiVxnq9JdbBEjdXrYgyjrZH38c9/D zayHCbSg==; Received: from 2001-1c00-8d85-5700-266e-96ff-fe07-7dcc.cable.dynamic.v6.ziggo.nl ([2001:1c00:8d85:5700:266e:96ff:fe07:7dcc] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vR4Yf-00000003ut4-3jM1; Thu, 04 Dec 2025 08:19:26 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 63D0430027B; Thu, 04 Dec 2025 09:19:14 +0100 (CET) Date: Thu, 4 Dec 2025 09:19:14 +0100 From: Peter Zijlstra To: kernel test robot Cc: Oleg Nesterov , oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: include/linux/seqlock.h:1257:undefined reference to `__scoped_seqlock_bug' Message-ID: <20251204081914.GA2528459@noisy.programming.kicks-ass.net> References: <202512032230.5pqkcg8x-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202512032230.5pqkcg8x-lkp@intel.com> On Wed, Dec 03, 2025 at 10:22:28PM +0800, kernel test robot wrote: > Hi Oleg, > > FYI, the error/warning still remains. I don't have this report in my inbox. I had some for other builds, which I fixed, but not this one. Anyway, let me go stare at it. This is the optimizer failing in some way. > 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