From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B612AC49EA6 for ; Wed, 23 Jun 2021 22:30:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D75160FEB for ; Wed, 23 Jun 2021 22:30:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229907AbhFWWcf (ORCPT ); Wed, 23 Jun 2021 18:32:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:60316 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229688AbhFWWce (ORCPT ); Wed, 23 Jun 2021 18:32:34 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AFB1C611C1; Wed, 23 Jun 2021 22:30:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624487416; bh=DhcHWMyjMVjNVHNhiFtI532fMsfdsNNY2V6a4zXHM+M=; h=Date:From:To:Cc:Subject:Reply-To:From; b=nZnhPuzcl63ZvhrCRydY4ZN7qmXjTsEzw4AlE7ZNZioNN/n28hh9idGLsqv9nWYSL 1rFdrLPR4Sk7CMPVxuz3rYiv3mm7Qp6nSpvwWO80Qh7g+n9RHZQwf1Y/txr0iH79/j ZwiTYSyMowQS9jPzI6ED/GxNvT1ZeWBwReF6LFqxHIUI04+SM79eFTSMgUyfsUpWkT Ke2Mmi9wOepE3owm4QxKbIuoTSmsdgjgziXNhG9f77ht1SbDw/47XjWcZ5MYPf+YBL aUc+RKHRyOLrfIFJICj/ZsqnHAsyTvMkH18JoCr8n4c2L7F/v2SLl4xCDfOzInysAB PIWkR80jSndvA== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 6359E5C08D8; Wed, 23 Jun 2021 15:30:15 -0700 (PDT) Date: Wed, 23 Jun 2021 15:30:15 -0700 From: "Paul E. McKenney" To: aneesh.kumar@linux.ibm.com Cc: linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, sfr@canb.auug.org.au, elver@google.com, ndesaulniers@google.com Subject: Build failure in -next Message-ID: <20210623223015.GA315292@paulmck-ThinkPad-P17-Gen-1> Reply-To: paulmck@kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Aneesh! Yesterday evening's next-20210622 testing gave me the following kernel-build error: ld: mm/mremap.o: in function `move_huge_pud': /home/git/linux-next/mm/mremap.c:372: undefined reference to `__compiletime_assert_395' Bisection landed on this commit: 257121c5aabe ("mm/mremap: convert huge PUD move to separate helper") I have no idea how this commit relates to that error message, but reverting this commit on top of next-20210622 really does get rid of the problem. The following reproducer provokes this error: tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --torture lock --configs LOCK07 --build-only --kconfig "CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y" --kmake-arg "CC=clang-11" Run the above command in the top-level directory of your -next source tree, and using this compiler: $ clang-11 -v Ubuntu clang version 11.1.0-++20210428103817+1fdec59bffc1-1~exp1~20210428204431.166 Target: x86_64-pc-linux-gnu Thoughts? Thanx, Paul