From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) by sourceware.org (Postfix) with ESMTP id 43F383857009 for ; Mon, 7 Dec 2020 10:00:40 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 43F383857009 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-234-RD8HXbZWPCKt0NI2g1yZng-1; Mon, 07 Dec 2020 05:00:37 -0500 X-MC-Unique: RD8HXbZWPCKt0NI2g1yZng-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C4D79858181; Mon, 7 Dec 2020 10:00:36 +0000 (UTC) Received: from oldenburg2.str.redhat.com (ovpn-112-194.ams2.redhat.com [10.36.112.194]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E39522BCC4; Mon, 7 Dec 2020 10:00:35 +0000 (UTC) From: Florian Weimer To: "H.J. Lu via Libc-alpha" Subject: Re: V5 [PATCH 2/2] ldconfig/x86: Add ISA level check to glibc-hwcaps References: <20201206144952.2109594-1-hjl.tools@gmail.com> <20201206144952.2109594-3-hjl.tools@gmail.com> Date: Mon, 07 Dec 2020 11:00:34 +0100 In-Reply-To: <20201206144952.2109594-3-hjl.tools@gmail.com> (H. J. Lu via Libc-alpha's message of "Sun, 6 Dec 2020 06:49:52 -0800") Message-ID: <87sg8ikkal.fsf@oldenburg2.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-6.1 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Dec 2020 10:00:42 -0000 * H. J. Lu via Libc-alpha: > Add ISA level check to detect misplaced shared objects with incompatible > ISA level requirement in glibc-hwcaps subdirectories: > > /sbin/ldconfig: /usr/lib64/glibc-hwcaps/x86-64-v2/libx86-64-isa-level.so: skipped, ISA level mismatch (x86-64-v4 > x86-64-v2) I think this is conceptually the wrong approach. ldconfig should copy the notes into the cache (and aux cache), and ld.so should skip cache contents that doesn't match the run-time requirements during load. Then directory place does not matter that much anymore. Thanks, Florian -- Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn, Commercial register: Amtsgericht Muenchen, HRB 153243, Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill