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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 86B28C6379F for ; Tue, 17 Jan 2023 16:23:05 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pHojX-00006i-Oq; Tue, 17 Jan 2023 11:22:47 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pHojT-000060-GB for qemu-devel@nongnu.org; Tue, 17 Jan 2023 11:22:47 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pHojR-0005Lk-Ux for qemu-devel@nongnu.org; Tue, 17 Jan 2023 11:22:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673972561; 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: in-reply-to:in-reply-to:references:references; bh=6bdcl2smhkDZVGHgw3VosgEyspzYgLmrfgH5NlnsPUc=; b=ZM9kaKjQJO2Nq0EQlxK+JXSu6AaZtsaH1o2DHu/EyUoZBJSfYuqRurc6POKY8mPbc5oGR6 PysypzTEETWKEuxx9pMK74h5dfF7KYf+Y6sFeKswNDWTEUpjMpjbr7nGL69AOgG5QRTGKP ayN9xQ8Ed0q0lnz8ZHiSH7BQC/AwZFA= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-139-2N6Pjm4cOmyccjV1ZruRAg-1; Tue, 17 Jan 2023 11:22:37 -0500 X-MC-Unique: 2N6Pjm4cOmyccjV1ZruRAg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1028B3843971; Tue, 17 Jan 2023 16:22:37 +0000 (UTC) Received: from localhost (unknown [10.39.194.48]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7F8081121315; Tue, 17 Jan 2023 16:22:36 +0000 (UTC) Date: Tue, 17 Jan 2023 11:22:35 -0500 From: Stefan Hajnoczi To: Emanuele Giuseppe Esposito Cc: qemu-devel@nongnu.org, Warner Losh , Kyle Evans , Kevin Wolf , Paolo Bonzini , Alex =?iso-8859-1?Q?Benn=E9e?= , Thomas Huth , Richard Henderson Subject: Re: [PATCH 0/3] TSA: make sure QEMU compiles when using clang TSA Message-ID: References: <20230117135203.3049709-1-eesposit@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="/0RbbXU9uPmEKM09" Content-Disposition: inline In-Reply-To: <20230117135203.3049709-1-eesposit@redhat.com> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --/0RbbXU9uPmEKM09 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Jan 17, 2023 at 08:52:00AM -0500, Emanuele Giuseppe Esposito wrote: > This serie aims to enable clang Thread Safety Analysis (TSA) in QEMU. It's worth covering what TSA is and why it's useful: Thread Safety Analysis "warns about potential race conditions in code. The analysis is completely static (i.e. compile-time); there is no run-time overhead" "Thread safety analysis works very much like a type system for multi-threaded programs. In addition to declaring the type of data (e.g. int, float, etc.), the programmer can (optionally) declare how access to that data is controlled in a multi-threaded environment. For example, if foo is guarded by the mutex mu, then the analysis will issue a warning whenever a piece of code reads or writes to foo without first locking mu." https://clang.llvm.org/docs/ThreadSafetyAnalysis.html --/0RbbXU9uPmEKM09 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmPGy0oACgkQnKSrs4Gr c8iW/wf/bgAz0lm4D52lwurS6tTLMzCmkPFTN2DfbI2RNytWAqP2ZA94afo7P8VJ LYRl9q78URnMOYF4+241lKDtX+7PCjOWng/eaEAd8Zk+Uq923CPbyeWwPjYaYA1N +piCht7o4IHoDFKpO6AlufPo9kqAd6IpPEGMEOY89PZvXqxPAlochIo6FfBb8/Eq ge3yFheMCVzbkq2KLsqqt6jxGO7Yg409YSpDkFMaoJ2u1MM+TOjMGXr/zEHccQrm 59SaX5J0+fu4hJj4fwwS42vmwhIQo/3J49ZynVOvK6FPSyAdrzC63iabt8cmvfqc x8drx1th+MrChkXPdL0IJ4xvdZbqWQ== =kXHx -----END PGP SIGNATURE----- --/0RbbXU9uPmEKM09--