From patchwork Fri Jul 12 17:00:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 1131460 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.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=linux-pci-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="fH07jTqw"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45lfMQ6LpNz9sBt for ; Sat, 13 Jul 2019 03:01:06 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727582AbfGLRBE (ORCPT ); Fri, 12 Jul 2019 13:01:04 -0400 Received: from mail-pl1-f194.google.com ([209.85.214.194]:36610 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727573AbfGLRBE (ORCPT ); Fri, 12 Jul 2019 13:01:04 -0400 Received: by mail-pl1-f194.google.com with SMTP id k8so5064132plt.3 for ; Fri, 12 Jul 2019 10:01:03 -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=eTBxLnGTenFE9+XP/mevxUw30LYF4J7nnGDQ6rB2fzk=; b=fH07jTqwL/hokqkrMKxzQmVSmNEeTNgVHxfUizZdRWuBLIdHp5EDtLX/oQGfOUzzsf cDeYRZzLJ7URL9QGlidpTqtiuUDkDdsc8U0Ap/nNRn7DDBs7v08P0les+ltErgSJDWbI nJW++gazD0MQx1M+9W1UojWsmaovMnp4hpbhU= 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=eTBxLnGTenFE9+XP/mevxUw30LYF4J7nnGDQ6rB2fzk=; b=bhpMs19vLHAzuI1eA1ISAafzkKaLu9LtdrstRSMbBpraYto4onBAOaUOERW3/eNT0p y+0orAPi5VyhGIc0C95Df7fQWw5kGkBv5SC+5p5QRGpc7uS7hvyRDj6mvDI8aUfWHNXN gLOVNjGe5lA0Pa6ukR6hhJemiHDq+UMPc9EV6pxO5pJJKUC94ph0OxEduR2Ave+nZXjL XYFxLt0ybg8r4zCk3tRIWlbrD6E3U3HTsnN/fGd6z53WjLtc4J+UNR12wHGTKSKJnXf/ Jk5P+CCkEXnYAJlE7Vdr24wmQUla1Ur/gio8IitYb5si9rVmcSkpegW5iF9FnXpOCe2E c8cw== X-Gm-Message-State: APjAAAUFsW3AD5SgBPvRe2cWyJ4VBCrV3osmc4OQt8F+F5wTMUvsOHxv UIkIftDtrH3bltBERvtaTvc= X-Google-Smtp-Source: APXvYqw5wjurKNbjLpkDIEgUNPsvw0lxvJGcBLec2mqxF+Z/PtTQcYyk2askr8FOnsLa9DqxCfYLnA== X-Received: by 2002:a17:902:24c:: with SMTP id 70mr12539402plc.2.1562950863174; Fri, 12 Jul 2019 10:01:03 -0700 (PDT) Received: from joelaf.cam.corp.google.com ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id a15sm7127385pgw.3.2019.07.12.10.00.59 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 12 Jul 2019 10:01:02 -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 v2 7/9] x86/pci: Pass lockdep condition to pcm_mmcfg_list iterator Date: Fri, 12 Jul 2019 13:00:22 -0400 Message-Id: <20190712170024.111093-8-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.510.g264f2c817a-goog In-Reply-To: <20190712170024.111093-1-joel@joelfernandes.org> References: <20190712170024.111093-1-joel@joelfernandes.org> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The pcm_mmcfg_list is traversed with list_for_each_entry_rcu without a reader-lock held, because the pci_mmcfg_lock is already held. Make this known to the list macro so that it fixes new lockdep warnings that trigger due to lockdep checks added to list_for_each_entry_rcu(). Signed-off-by: Joel Fernandes (Google) --- arch/x86/pci/mmconfig-shared.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c index 7389db538c30..6fa42e9c4e6f 100644 --- a/arch/x86/pci/mmconfig-shared.c +++ b/arch/x86/pci/mmconfig-shared.c @@ -29,6 +29,7 @@ static bool pci_mmcfg_running_state; static bool pci_mmcfg_arch_init_failed; static DEFINE_MUTEX(pci_mmcfg_lock); +#define pci_mmcfg_lock_held() lock_is_held(&(pci_mmcfg_lock).dep_map) LIST_HEAD(pci_mmcfg_list); @@ -54,7 +55,7 @@ static void list_add_sorted(struct pci_mmcfg_region *new) struct pci_mmcfg_region *cfg; /* keep list sorted by segment and starting bus number */ - list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) { + list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list, pci_mmcfg_lock_held()) { if (cfg->segment > new->segment || (cfg->segment == new->segment && cfg->start_bus >= new->start_bus)) { @@ -118,7 +119,7 @@ struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus) { struct pci_mmcfg_region *cfg; - list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) + list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list, pci_mmcfg_lock_held()) if (cfg->segment == segment && cfg->start_bus <= bus && bus <= cfg->end_bus) return cfg;