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=-11.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 648B8C433DF for ; Fri, 22 May 2020 16:09:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4599120723 for ; Fri, 22 May 2020 16:09:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730767AbgEVQJT (ORCPT ); Fri, 22 May 2020 12:09:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41096 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730511AbgEVQIw (ORCPT ); Fri, 22 May 2020 12:08:52 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C2B8C061A0E; Fri, 22 May 2020 09:08:52 -0700 (PDT) Received: from [5.158.153.53] (helo=tip-bot2.lab.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jcAE3-00009v-QX; Fri, 22 May 2020 18:08:47 +0200 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id 2316D1C0095; Fri, 22 May 2020 18:08:47 +0200 (CEST) Date: Fri, 22 May 2020 16:08:47 -0000 From: "tip-bot2 for Marco Elver" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: locking/kcsan] kcsan: Update Documentation to change supported compilers Cc: Marco Elver , Borislav Petkov , "Peter Zijlstra (Intel)" , Will Deacon , x86 , LKML In-Reply-To: <20200521142047.169334-8-elver@google.com> References: <20200521142047.169334-8-elver@google.com> MIME-Version: 1.0 Message-ID: <159016372701.17951.14792231377616807344.tip-bot2@tip-bot2> X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the locking/kcsan branch of tip: Commit-ID: 345043266de282a4059bc8336e2bcdd3680cc8f0 Gitweb: https://git.kernel.org/tip/345043266de282a4059bc8336e2bcdd3680cc8f0 Author: Marco Elver AuthorDate: Thu, 21 May 2020 16:20:43 +02:00 Committer: Borislav Petkov CommitterDate: Fri, 22 May 2020 15:13:45 +02:00 kcsan: Update Documentation to change supported compilers Document change in required compiler version for KCSAN, and remove the now redundant note about __no_kcsan and inlining problems with older compilers. Signed-off-by: Marco Elver Signed-off-by: Borislav Petkov Acked-by: Peter Zijlstra (Intel) Acked-by: Will Deacon Link: https://lkml.kernel.org/r/20200521142047.169334-8-elver@google.com --- Documentation/dev-tools/kcsan.rst | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/Documentation/dev-tools/kcsan.rst b/Documentation/dev-tools/kcsan.rst index f4b5766..ce4bbd9 100644 --- a/Documentation/dev-tools/kcsan.rst +++ b/Documentation/dev-tools/kcsan.rst @@ -8,8 +8,7 @@ approach to detect races. KCSAN's primary purpose is to detect `data races`_. Usage ----- -KCSAN is supported in both GCC and Clang. With GCC it requires version 7.3.0 or -later. With Clang it requires version 7.0.0 or later. +KCSAN requires Clang version 11 or later. To enable KCSAN configure the kernel with:: @@ -121,12 +120,6 @@ the below options are available: static __no_kcsan_or_inline void foo(void) { ... - Note: Older compiler versions (GCC < 9) also do not always honor the - ``__no_kcsan`` attribute on regular ``inline`` functions. If false positives - with these compilers cannot be tolerated, for small functions where - ``__always_inline`` would be appropriate, ``__no_kcsan_or_inline`` should be - preferred instead. - * To disable data race detection for a particular compilation unit, add to the ``Makefile``::