From patchwork Mon Jul 15 14:36:57 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 1132045 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=joelfernandes.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=joelfernandes.org header.i=@joelfernandes.org header.b="QjihkdzO"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45nR2C4XJFz9sVC for ; Tue, 16 Jul 2019 00:37:23 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404452AbfGOOhV (ORCPT ); Mon, 15 Jul 2019 10:37:21 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:39986 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404383AbfGOOhT (ORCPT ); Mon, 15 Jul 2019 10:37:19 -0400 Received: by mail-pg1-f193.google.com with SMTP id w10so7809564pgj.7 for ; Mon, 15 Jul 2019 07:37:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelfernandes.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=peLCyvMnb6GAqXrVywa8AT70STEJ77uX6TkkVXJzQ/M=; b=QjihkdzO56EyWdL1UBrowr4J0diPIpjeawlNo5eUXRlutEI+PMdDLg/2ovhGCm9dB1 am3dJfpAJ98Tx9IokTbTDJI/QLnhNHnLoi+VI/95oP5fp/RwwQCZGPG9aCEKUlUpO/1N atHPVJ+wXVzYcfg26NNOs6IX7iznL6Gp2AAwA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=peLCyvMnb6GAqXrVywa8AT70STEJ77uX6TkkVXJzQ/M=; b=HnQ0ihqEVz/wBsg3xNF7xSx/1w/UXjC5zgi9EFZ0zSgzpHFLD4LuMIDsbJB7ESUE2N VlsQjFlUiIkgPG5apYAanyXxPYSZjA1J/nrdegbTXJUIaNtrUJQSJ3GZVcGG0EqlSJ85 7hVrkXj198m3Mvg/eLpc+Kd7oGBa5WUXU/2AuwupwpvFfptFaszmzcea9oMbf+/G3y4F kBrRiX9HpJ67OaC2FjmDP7KQ4Y9b4Xm/XDmIF6F+Yy1R4MGEzF/gM0V86qUiXzuNtPMd p+ZOLXHhu8vHjtY92IuMMYnZIAQ1oC5nMnPZK8N7AGc+Thfcx+elZwaI5x0uvPNMKjte 2WBQ== X-Gm-Message-State: APjAAAWy0xRYv4BwjfTT/yXZ7KzVkdW07JtCE6+0CLqyew5gvqI0tnGI ceeFGL0QR32MLwjhNpk2/TI= X-Google-Smtp-Source: APXvYqzmK9tD8rYXtIru39NtpVyI6dVamC0JOl/Vm3L4KkimM24dL0CBqeO9C1zAEuPYG8wK9FgMFA== X-Received: by 2002:a65:6281:: with SMTP id f1mr25763664pgv.400.1563201437978; Mon, 15 Jul 2019 07:37:17 -0700 (PDT) Received: from joelaf.cam.corp.google.com ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id s66sm18381852pfs.8.2019.07.15.07.37.14 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 15 Jul 2019 07:37:17 -0700 (PDT) From: "Joel Fernandes (Google)" To: linux-kernel@vger.kernel.org Cc: "Joel Fernandes (Google)" , Alexey Kuznetsov , Bjorn Helgaas , Borislav Petkov , c0d1n61at3@gmail.com, "David S. Miller" , edumazet@google.com, Greg Kroah-Hartman , Hideaki YOSHIFUJI , "H. Peter Anvin" , Ingo Molnar , Jonathan Corbet , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, kernel-team@android.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, Oleg Nesterov , "Paul E. McKenney" , Pavel Machek , peterz@infradead.org, "Rafael J. Wysocki" , Rasmus Villemoes , rcu@vger.kernel.org, Steven Rostedt , Tejun Heo , Thomas Gleixner , will@kernel.org, x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)) Subject: [PATCH 1/9] rcu/update: Remove useless check for debug_locks (v1) Date: Mon, 15 Jul 2019 10:36:57 -0400 Message-Id: <20190715143705.117908-2-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.510.g264f2c817a-goog In-Reply-To: <20190715143705.117908-1-joel@joelfernandes.org> References: <20190715143705.117908-1-joel@joelfernandes.org> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In rcu_read_lock_sched_held(), debug_locks can never be true at the point we check it because we already check debug_locks in debug_lockdep_rcu_enabled() in the beginning. Remove the check. Signed-off-by: Joel Fernandes (Google) --- kernel/rcu/update.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 61df2bf08563..9dd5aeef6e70 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -93,17 +93,13 @@ module_param(rcu_normal_after_boot, int, 0); */ int rcu_read_lock_sched_held(void) { - int lockdep_opinion = 0; - if (!debug_lockdep_rcu_enabled()) return 1; if (!rcu_is_watching()) return 0; if (!rcu_lockdep_current_cpu_online()) return 0; - if (debug_locks) - lockdep_opinion = lock_is_held(&rcu_sched_lock_map); - return lockdep_opinion || !preemptible(); + return lock_is_held(&rcu_sched_lock_map) || !preemptible(); } EXPORT_SYMBOL(rcu_read_lock_sched_held); #endif