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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <202311061616.cd495695-oliver.sang@intel.com> <3865842.1700061614@warthog.procyon.org.uk> To: Linus Torvalds Cc: dhowells@redhat.com, Borislav Petkov , kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Christian Brauner , Alexander Viro , Jens Axboe , Christoph Hellwig , Christian Brauner , Matthew Wilcox , David Laight , ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com Subject: Re: [linus:master] [iov_iter] c9eec08bac: vm-scalability.throughput -16.9% regression MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <4097022.1700084620.1@warthog.procyon.org.uk> Content-Transfer-Encoding: quoted-printable Date: Wed, 15 Nov 2023 21:43:40 +0000 Message-ID: <4097023.1700084620@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 X-Spam-Status: No, score=-1.0 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Wed, 15 Nov 2023 13:43:58 -0800 (PST) I get: LD arch/x86/purgatory/purgatory.chk ld: arch/x86/purgatory/purgatory.ro:(.altinstr_replacement+0x1): undefined= reference to `rep_movs_alternative' ld: arch/x86/purgatory/purgatory.ro:(.altinstr_replacement+0x6): undefined= reference to `rep_movs_alternative' The symbol is available in the arch lib directory: warthog>nm build3/arch/x86/lib/copy_user_64.o = 0000000000000000 r __export_symbol_rep_movs_alternative 0000000000000000 T rep_movs_alternative U __x86_return_thunk so I'm not sure what's going on there. David