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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 3EC9BC433DF for ; Tue, 23 Jun 2020 00:43:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 15EF320706 for ; Tue, 23 Jun 2020 00:43:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592873025; bh=jrOmpIYRGGdv4biWjWMFc7j2MPWzccEJa2EzeRZdGBY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=X4sdblaIi754mDPXkHJssaKcU5WeLqCheoQ+1b8d04xv4BCSn62lsxQyfFXbiuUo1 L7FDMn45aA5TalRMWzKVxBpA/3JUvjrIP8o+8YW6BSAw292y41lAG3AVpTAs7/jwLk xzrHB8Y475IDPgZilwdI9I2/xqoANGOpr2J87aL4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732272AbgFWAnn (ORCPT ); Mon, 22 Jun 2020 20:43:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:40802 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732199AbgFWAnh (ORCPT ); Mon, 22 Jun 2020 20:43:37 -0400 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C12222083B; Tue, 23 Jun 2020 00:43:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592873016; bh=jrOmpIYRGGdv4biWjWMFc7j2MPWzccEJa2EzeRZdGBY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wO8lF03VlOUUyCvAaLkVzGmxZfqunthvzgKAmMDOyuvruPmpMIUtetuGal7VfTKLv GvA+2WR6dMS4Nx7NBRgmyDnNdRSTBIlCszr01H7bxycIExQd6I+7xoOl1uQFKnxdzI dkkXik+lLnsDNEGkGaEWNwcS0F28Stz+F2/DBnJY= From: paulmck@kernel.org To: linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, kernel-team@fb.com, mingo@kernel.org Cc: elver@google.com, andreyknvl@google.com, glider@google.com, dvyukov@google.com, cai@lca.pw, boqun.feng@gmail.com, "Paul E . McKenney" Subject: [PATCH tip/core/rcu 09/10] kcsan: Remove existing special atomic rules Date: Mon, 22 Jun 2020 17:43:32 -0700 Message-Id: <20200623004333.27227-9-paulmck@kernel.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20200623003731.GA26717@paulmck-ThinkPad-P72> References: <20200623003731.GA26717@paulmck-ThinkPad-P72> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marco Elver Remove existing special atomic rules from kcsan_is_atomic_special() because they are no longer needed. Since we rely on the compiler emitting instrumentation distinguishing volatile accesses, the rules have become redundant. Let's keep kcsan_is_atomic_special() around, so that we have an obvious place to add special rules should the need arise in future. Signed-off-by: Marco Elver Signed-off-by: Paul E. McKenney --- kernel/kcsan/atomic.h | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/kcsan/atomic.h b/kernel/kcsan/atomic.h index be9e625..75fe701 100644 --- a/kernel/kcsan/atomic.h +++ b/kernel/kcsan/atomic.h @@ -3,8 +3,7 @@ #ifndef _KERNEL_KCSAN_ATOMIC_H #define _KERNEL_KCSAN_ATOMIC_H -#include -#include +#include /* * Special rules for certain memory where concurrent conflicting accesses are @@ -13,8 +12,7 @@ */ static bool kcsan_is_atomic_special(const volatile void *ptr) { - /* volatile globals that have been observed in data races. */ - return ptr == &jiffies || ptr == ¤t->state; + return false; } #endif /* _KERNEL_KCSAN_ATOMIC_H */ -- 2.9.5