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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C32AC072A2 for ; Wed, 15 Nov 2023 21:43:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235623AbjKOVnx (ORCPT ); Wed, 15 Nov 2023 16:43:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229655AbjKOVnw (ORCPT ); Wed, 15 Nov 2023 16:43:52 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A4EDE1 for ; Wed, 15 Nov 2023 13:43:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1700084628; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=y0sd3KVgqm2Hr+/w0M78+lQuRWNqCNiH7NNttu2olag=; b=dl7no4csnRS18uUCm4KtCWczEBL8gqyE9EUKJqbXmZkJBblrGx3YQXvBC9l3PxJIetEYse hMAtV+vXempwnHXPkVtepDxnWnqa6KTqN21gx/FIAsvYMdD8UkSIcBSuhBq+eCFFbvSOX5 eFQdIxYl5YYFyrdtq2cqVKgkc3nnu/0= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-176-roBR4RgdPHOO-T9YuhAVqw-1; Wed, 15 Nov 2023 16:43:43 -0500 X-MC-Unique: roBR4RgdPHOO-T9YuhAVqw-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E46BF38062A6; Wed, 15 Nov 2023 21:43:42 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.42.28.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id EE6E2492BE0; Wed, 15 Nov 2023 21:43:40 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. 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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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