From patchwork Thu Jul 11 23:43:56 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 11040921 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7AA32138B for ; Thu, 11 Jul 2019 23:44:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6AE3C28B8A for ; Thu, 11 Jul 2019 23:44:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5EBA228B97; Thu, 11 Jul 2019 23:44:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DBA1128B8B for ; Thu, 11 Jul 2019 23:44:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729220AbfGKXoU (ORCPT ); Thu, 11 Jul 2019 19:44:20 -0400 Received: from mail-pl1-f193.google.com ([209.85.214.193]:45081 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729553AbfGKXoT (ORCPT ); Thu, 11 Jul 2019 19:44:19 -0400 Received: by mail-pl1-f193.google.com with SMTP id y8so3815933plr.12 for ; Thu, 11 Jul 2019 16:44:19 -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=FITTKsy0ccvIyixSPRiCdGiovalZSrd3OHcUD21QK98=; b=IGKpfpLdCh9L199i85cDoWBN2sVOwSD+UtAb3c4qrcAw43wxgeMdcgA9g+jve3LID5 6vOOpxemLXJj1CZ79tB3Pje6chjO0HvYbVetcbgPQoCchXFtYur1Efy9Q7vdAWUF4ngJ VBDST6I2Pm3/IeSKN7V5T8vNCOjcm1ESkYOGo= 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=FITTKsy0ccvIyixSPRiCdGiovalZSrd3OHcUD21QK98=; b=Y+PQ19JQLx4Qs1wPSCJeuNGY/VvH/LKQKWThRy4s3Ar+d9rprfWC8MByC8gvdY4lIB Z+lgOMKUzKlkclm5mrnMFIoREpF6wQ9IVvh/KO+zpwvlwgCS5cc4RSqJRjAyUysVosBZ oVTSOCEx0LDCmscD3d54V2iI/uekrFX3wr81hVqgkv7LBX8nZh/ib3ITKanIXx6qY2Na FEN6FXzH6SSvp2RVQX7MXfNEpB2gSnkr2zMIneaNiNVif2WwzAsMZZwKO9Lmajvw0bR1 LKtTk0FX1EhzD6kAGy7mlxkhQdvFNVv3H/plAE+g1eHQXQIAgoF7bg9m43h8Cf2WLaz3 YvXw== X-Gm-Message-State: APjAAAUlvNsMzuOxYHNXEN5TYB4AaXfHNpK1suP+t4H9MqQ3g3Sbgzti GWxc9AfRlu2uPvQ+BuOP9U0= X-Google-Smtp-Source: APXvYqwozgq75nMKR73qox3f/PRoDIY5soJTLm7wRfHEcQK+usIOeqo0yORbOwCrmC8k4mWWATDhPg== X-Received: by 2002:a17:902:e281:: with SMTP id cf1mr7321567plb.271.1562888658619; Thu, 11 Jul 2019 16:44:18 -0700 (PDT) Received: from joelaf.cam.corp.google.com ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id t10sm6163450pjr.13.2019.07.11.16.44.15 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 11 Jul 2019 16:44:17 -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 , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, oleg@redhat.com, "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 v1 1/6] rcu: Add support for consolidated-RCU reader checking Date: Thu, 11 Jul 2019 19:43:56 -0400 Message-Id: <20190711234401.220336-2-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog In-Reply-To: <20190711234401.220336-1-joel@joelfernandes.org> References: <20190711234401.220336-1-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 X-Virus-Scanned: ClamAV using ClamSMTP This patch adds support for checking RCU reader sections in list traversal macros. Optionally, if the list macro is called under SRCU or other lock/mutex protection, then appropriate lockdep expressions can be passed to make the checks pass. Existing list_for_each_entry_rcu() invocations don't need to pass the optional fourth argument (cond) unless they are under some non-RCU protection and needs to make lockdep check pass. Signed-off-by: Joel Fernandes (Google) --- include/linux/rculist.h | 29 ++++++++++++++++++++++++----- include/linux/rcupdate.h | 7 +++++++ kernel/rcu/Kconfig.debug | 11 +++++++++++ kernel/rcu/update.c | 26 ++++++++++++++++++++++++++ 4 files changed, 68 insertions(+), 5 deletions(-) diff --git a/include/linux/rculist.h b/include/linux/rculist.h index e91ec9ddcd30..78c15ec6b2c9 100644 --- a/include/linux/rculist.h +++ b/include/linux/rculist.h @@ -40,6 +40,23 @@ static inline void INIT_LIST_HEAD_RCU(struct list_head *list) */ #define list_next_rcu(list) (*((struct list_head __rcu **)(&(list)->next))) +/* + * Check during list traversal that we are within an RCU reader + */ + +#define SIXTH_ARG(a1, a2, a3, a4, a5, a6, ...) a6 +#define COUNT_VARGS(...) SIXTH_ARG(dummy, ## __VA_ARGS__, 4, 3, 2, 1, 0) + +#ifdef CONFIG_PROVE_RCU_LIST +#define __list_check_rcu(dummy, cond, ...) \ + ({ \ + RCU_LOCKDEP_WARN(!cond && !rcu_read_lock_any_held(), \ + "RCU-list traversed in non-reader section!"); \ + }) +#else +#define __list_check_rcu(dummy, cond, ...) ({}) +#endif + /* * Insert a new entry between two known consecutive entries. * @@ -348,9 +365,10 @@ static inline void list_splice_tail_init_rcu(struct list_head *list, * the _rcu list-mutation primitives such as list_add_rcu() * as long as the traversal is guarded by rcu_read_lock(). */ -#define list_for_each_entry_rcu(pos, head, member) \ - for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ - &pos->member != (head); \ +#define list_for_each_entry_rcu(pos, head, member, cond...) \ + for (__list_check_rcu(dummy, ## cond, 0), \ + pos = list_entry_rcu((head)->next, typeof(*pos), member); \ + &pos->member != (head); \ pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) /** @@ -621,8 +639,9 @@ static inline void hlist_add_behind_rcu(struct hlist_node *n, * the _rcu list-mutation primitives such as hlist_add_head_rcu() * as long as the traversal is guarded by rcu_read_lock(). */ -#define hlist_for_each_entry_rcu(pos, head, member) \ - for (pos = hlist_entry_safe (rcu_dereference_raw(hlist_first_rcu(head)),\ +#define hlist_for_each_entry_rcu(pos, head, member, cond...) \ + for (__list_check_rcu(dummy, ## cond, 0), \ + pos = hlist_entry_safe (rcu_dereference_raw(hlist_first_rcu(head)),\ typeof(*(pos)), member); \ pos; \ pos = hlist_entry_safe(rcu_dereference_raw(hlist_next_rcu(\ diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 922bb6848813..712b464ab960 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -223,6 +223,7 @@ int debug_lockdep_rcu_enabled(void); int rcu_read_lock_held(void); int rcu_read_lock_bh_held(void); int rcu_read_lock_sched_held(void); +int rcu_read_lock_any_held(void); #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ @@ -243,6 +244,12 @@ static inline int rcu_read_lock_sched_held(void) { return !preemptible(); } + +static inline int rcu_read_lock_any_held(void) +{ + return !preemptible(); +} + #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ #ifdef CONFIG_PROVE_RCU diff --git a/kernel/rcu/Kconfig.debug b/kernel/rcu/Kconfig.debug index 0ec7d1d33a14..b20d0e2903d1 100644 --- a/kernel/rcu/Kconfig.debug +++ b/kernel/rcu/Kconfig.debug @@ -7,6 +7,17 @@ menu "RCU Debugging" config PROVE_RCU def_bool PROVE_LOCKING +config PROVE_RCU_LIST + bool "RCU list lockdep debugging" + depends on PROVE_RCU + default n + help + Enable RCU lockdep checking for list usages. By default it is + turned off since there are several list RCU users that still + need to be converted to pass a lockdep expression. To prevent + false-positive splats, we keep it default disabled but once all + users are converted, we can remove this config option. + config TORTURE_TEST tristate default n diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index c3bf44ba42e5..9cb30006a5e1 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -298,6 +298,32 @@ int rcu_read_lock_bh_held(void) } EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held); +int rcu_read_lock_any_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; + + /* Preemptible RCU flavor */ + if (lock_is_held(&rcu_lock_map)) + return 1; + + /* BH flavor */ + if (in_softirq() || irqs_disabled()) + return 1; + + /* Sched flavor */ + if (debug_locks) + lockdep_opinion = lock_is_held(&rcu_sched_lock_map); + return lockdep_opinion || !preemptible(); +} +EXPORT_SYMBOL_GPL(rcu_read_lock_any_held); + #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ /** From patchwork Thu Jul 11 23:43:57 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 11040923 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B00841805 for ; Thu, 11 Jul 2019 23:44:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A028428B8A for ; Thu, 11 Jul 2019 23:44:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 93D1A28B8B; Thu, 11 Jul 2019 23:44:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0726D28B90 for ; Thu, 11 Jul 2019 23:44:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730463AbfGKXoX (ORCPT ); Thu, 11 Jul 2019 19:44:23 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:34557 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730452AbfGKXoX (ORCPT ); Thu, 11 Jul 2019 19:44:23 -0400 Received: by mail-pg1-f193.google.com with SMTP id p10so3671324pgn.1 for ; Thu, 11 Jul 2019 16:44:22 -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=/GuW47+ITVwlHRyFWoit77iH8wSxBVV56wbG/AJ8g+A=; b=POP2I6vcsX7mrpLNszrDZ3jHjn5JeGjYvt0TIBarOc+TTSSHTMCxN8ZJl3umrbGe13 LL/K6XJbcw8liWBMr5VJm7tJsyYXkpeSHOo93Z5cFDVSa8Vym2EQZ+vSjFXjz8J4Wkoy ABgjJP8Cfel0JsMbqaLz7L8BjEej7RSdpehss= 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=/GuW47+ITVwlHRyFWoit77iH8wSxBVV56wbG/AJ8g+A=; b=ozFArlWp4frBlcXu/awFiowHl+zAYzboyFYEGQL8ss6zlC+tbraZOjOCnVfQsrsTvP FKbVzKHtXo2BgPMAl1IgfUU7Xbn8NZIGCbev+HBV5exYzjQkTgu4h88aERs2O88ZtaEk gRcDD8WJG6fRxUml2uoRLwvlK1Iq2sZBPDaU1efbj7Ujm8hdDS7LeL0M1Nn06AqK99Ho azm4nPPp0h3CiIo/2APtl+Tz4inz/QfJXS2UTi1Qbsoy74vY52YJwRPaXnkbHoWDp6tt 5wk+lP5S+Cc3rYvhQPnAsAwQjU1TjXovZAsAXX4kogfg2AZKHCicNu9zU2HRXAFTug3E oG3Q== X-Gm-Message-State: APjAAAWO+8LL4QU3enUMdNFRr0oyPtvYB0UehpmdEWsj2MWhIUT1fBel KSiCSCsRTLI3CvEz2BeOAkM= X-Google-Smtp-Source: APXvYqwL3radJMAbdECmS/G+TOrWXAIf4q3T6x0oa7czoYNYGbVr9jTCwdHXMM+5nal4G43CSaqnjQ== X-Received: by 2002:a63:3f48:: with SMTP id m69mr7029829pga.17.1562888662320; Thu, 11 Jul 2019 16:44:22 -0700 (PDT) Received: from joelaf.cam.corp.google.com ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id t10sm6163450pjr.13.2019.07.11.16.44.18 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 11 Jul 2019 16:44:21 -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 , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, oleg@redhat.com, "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 v1 2/6] ipv4: add lockdep condition to fix for_each_entry Date: Thu, 11 Jul 2019 19:43:57 -0400 Message-Id: <20190711234401.220336-3-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog In-Reply-To: <20190711234401.220336-1-joel@joelfernandes.org> References: <20190711234401.220336-1-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 X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Joel Fernandes (Google) --- net/ipv4/fib_frontend.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index b298255f6fdb..ef7c9f8e8682 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -127,7 +127,8 @@ struct fib_table *fib_get_table(struct net *net, u32 id) h = id & (FIB_TABLE_HASHSZ - 1); head = &net->ipv4.fib_table_hash[h]; - hlist_for_each_entry_rcu(tb, head, tb_hlist) { + hlist_for_each_entry_rcu(tb, head, tb_hlist, + lockdep_rtnl_is_held()) { if (tb->tb_id == id) return tb; } From patchwork Thu Jul 11 23:43:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 11040959 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 85E57912 for ; Thu, 11 Jul 2019 23:45:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 77A8428B8A for ; Thu, 11 Jul 2019 23:45:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6B5AA28B92; Thu, 11 Jul 2019 23:45:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0475628B8A for ; Thu, 11 Jul 2019 23:45:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729612AbfGKXo5 (ORCPT ); Thu, 11 Jul 2019 19:44:57 -0400 Received: from mail-pf1-f193.google.com ([209.85.210.193]:39644 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730476AbfGKXo1 (ORCPT ); Thu, 11 Jul 2019 19:44:27 -0400 Received: by mail-pf1-f193.google.com with SMTP id j2so3461773pfe.6 for ; Thu, 11 Jul 2019 16:44:26 -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=DxaBT1tnbAEQu4unrE+ZIdJanB1uVhDn4/7rfKQHrQ8=; b=ZR89dJ0gCvmFd48H56kuCm2XzQpnVhPx64wtgiHyZvxa33ANSu0oXUTttSIxFI0x9Z fHKlA+45Bqn3L3g08DQds8w60ml29tD/QN8R/vX0Ix2Z2Akl/LzUSDrgZDI4Q/+otrRY I+DBueCyfUEugUlr0uSGpkRYwIAjZJZdHOtgc= 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=DxaBT1tnbAEQu4unrE+ZIdJanB1uVhDn4/7rfKQHrQ8=; b=N8R02lgYALYxmJKgi3u6kgiGZ1kYJhUyz44w5djEwf7/6PA2kCrAEM6iZ0tXuNf15l R1WGLstRaahrl1y/0X+/r0qd64IwfD2ryULSwakI9AJOrm7tph/gIE8WixKjwHZHy3vs 78giOluw9FIPGplnMCrs97xbjAAS7B6gpxuh8TtzT4OqOPNJmGnEsvtgV2dXkVqNuQnw Olmi0/yMXd2jlE9VgJD5K2gACwIBerRUDcoWkJNvk3P3ue4e77QQrJEd2Jtt9qIH9xXO yyytPahBGcS8Vmf7ERdnQ99jT2COsO0sv8laCtByAbJwKIa+SGFUpDNgqL03gKNQLLkX VbPA== X-Gm-Message-State: APjAAAXbByiG3BP367HFgv+zPD/xl9RguD/ht+CReRpRUnJSD2o7s9Mt aKVej3nM4QEjcAd05xSJzME= X-Google-Smtp-Source: APXvYqzUKLrrGWpDYD2bC1yFQhR2A3bxbRxsjgXB3UX8GkC2wLperL0TYvgWXgyR72s0kBdwkN7Ihw== X-Received: by 2002:a63:5212:: with SMTP id g18mr2790151pgb.387.1562888666095; Thu, 11 Jul 2019 16:44:26 -0700 (PDT) Received: from joelaf.cam.corp.google.com ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id t10sm6163450pjr.13.2019.07.11.16.44.22 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 11 Jul 2019 16:44:25 -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 , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, oleg@redhat.com, "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 v1 3/6] driver/core: Convert to use built-in RCU list checking Date: Thu, 11 Jul 2019 19:43:58 -0400 Message-Id: <20190711234401.220336-4-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog In-Reply-To: <20190711234401.220336-1-joel@joelfernandes.org> References: <20190711234401.220336-1-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 X-Virus-Scanned: ClamAV using ClamSMTP list_for_each_entry_rcu has built-in RCU and lock checking. Make use of it in driver core. Signed-off-by: Joel Fernandes (Google) Acked-by: Greg Kroah-Hartman --- drivers/base/base.h | 1 + drivers/base/core.c | 10 ++++++++++ drivers/base/power/runtime.c | 15 ++++++++++----- 3 files changed, 21 insertions(+), 5 deletions(-) diff --git a/drivers/base/base.h b/drivers/base/base.h index b405436ee28e..0d32544b6f91 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -165,6 +165,7 @@ static inline int devtmpfs_init(void) { return 0; } /* Device links support */ extern int device_links_read_lock(void); extern void device_links_read_unlock(int idx); +extern int device_links_read_lock_held(void); extern int device_links_check_suppliers(struct device *dev); extern void device_links_driver_bound(struct device *dev); extern void device_links_driver_cleanup(struct device *dev); diff --git a/drivers/base/core.c b/drivers/base/core.c index fd7511e04e62..6c5ca9685647 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -68,6 +68,11 @@ void device_links_read_unlock(int idx) { srcu_read_unlock(&device_links_srcu, idx); } + +int device_links_read_lock_held(void) +{ + return srcu_read_lock_held(&device_links_srcu); +} #else /* !CONFIG_SRCU */ static DECLARE_RWSEM(device_links_lock); @@ -91,6 +96,11 @@ void device_links_read_unlock(int not_used) { up_read(&device_links_lock); } + +int device_links_read_lock_held(void) +{ + return lock_is_held(&device_links_lock); +} #endif /* !CONFIG_SRCU */ /** diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 952a1e7057c7..7a10e8379a70 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -287,7 +287,8 @@ static int rpm_get_suppliers(struct device *dev) { struct device_link *link; - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { + list_for_each_entry_rcu(link, &dev->links.suppliers, c_node, + device_links_read_lock_held()) { int retval; if (!(link->flags & DL_FLAG_PM_RUNTIME) || @@ -309,7 +310,8 @@ static void rpm_put_suppliers(struct device *dev) { struct device_link *link; - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { + list_for_each_entry_rcu(link, &dev->links.suppliers, c_node, + device_links_read_lock_held()) { if (READ_ONCE(link->status) == DL_STATE_SUPPLIER_UNBIND) continue; @@ -1640,7 +1642,8 @@ void pm_runtime_clean_up_links(struct device *dev) idx = device_links_read_lock(); - list_for_each_entry_rcu(link, &dev->links.consumers, s_node) { + list_for_each_entry_rcu(link, &dev->links.consumers, s_node, + device_links_read_lock_held()) { if (link->flags & DL_FLAG_STATELESS) continue; @@ -1662,7 +1665,8 @@ void pm_runtime_get_suppliers(struct device *dev) idx = device_links_read_lock(); - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) + list_for_each_entry_rcu(link, &dev->links.suppliers, c_node, + device_links_read_lock_held()) if (link->flags & DL_FLAG_PM_RUNTIME) { link->supplier_preactivated = true; refcount_inc(&link->rpm_active); @@ -1683,7 +1687,8 @@ void pm_runtime_put_suppliers(struct device *dev) idx = device_links_read_lock(); - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) + list_for_each_entry_rcu(link, &dev->links.suppliers, c_node, + device_links_read_lock_held()) if (link->supplier_preactivated) { link->supplier_preactivated = false; if (refcount_dec_not_one(&link->rpm_active)) From patchwork Thu Jul 11 23:43:59 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 11040953 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4084D912 for ; Thu, 11 Jul 2019 23:44:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3197A28B8A for ; Thu, 11 Jul 2019 23:44:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 24CD028B90; Thu, 11 Jul 2019 23:44:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D49CB28B8A for ; 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Miller" , edumazet@google.com, Greg Kroah-Hartman , Hideaki YOSHIFUJI , "H. Peter Anvin" , Ingo Molnar , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, oleg@redhat.com, "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 v1 4/6] workqueue: Convert for_each_wq to use built-in list check Date: Thu, 11 Jul 2019 19:43:59 -0400 Message-Id: <20190711234401.220336-5-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog In-Reply-To: <20190711234401.220336-1-joel@joelfernandes.org> References: <20190711234401.220336-1-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 X-Virus-Scanned: ClamAV using ClamSMTP list_for_each_entry_rcu now has support to check for RCU reader sections as well as lock. Just use the support in it, instead of explictly checking in the caller. Signed-off-by: Joel Fernandes (Google) --- kernel/workqueue.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 9657315405de..91ed7aca16e5 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -424,9 +424,8 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq); * ignored. */ #define for_each_pwq(pwq, wq) \ - list_for_each_entry_rcu((pwq), &(wq)->pwqs, pwqs_node) \ - if (({ assert_rcu_or_wq_mutex(wq); false; })) { } \ - else + list_for_each_entry_rcu((pwq), &(wq)->pwqs, pwqs_node, \ + lock_is_held(&(wq->mutex).dep_map)) #ifdef CONFIG_DEBUG_OBJECTS_WORK From patchwork Thu Jul 11 23:44:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 11040947 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 374B8138B for ; Thu, 11 Jul 2019 23:44:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2813B28B8A for ; Thu, 11 Jul 2019 23:44:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1BE1028B8B; Thu, 11 Jul 2019 23:44:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C572228B92 for ; Thu, 11 Jul 2019 23:44:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730501AbfGKXou (ORCPT ); Thu, 11 Jul 2019 19:44:50 -0400 Received: from mail-pf1-f193.google.com ([209.85.210.193]:45503 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730502AbfGKXoe (ORCPT ); Thu, 11 Jul 2019 19:44:34 -0400 Received: by mail-pf1-f193.google.com with SMTP id r1so3445332pfq.12 for ; Thu, 11 Jul 2019 16:44:34 -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=2ZIVHYCgJL3yRIi6SYczqkcDc7iwVPEmctKSmd2Crvc=; b=weyT2Xtq2vSltoDfjRS7QyAHHP5rgF8+biSlRsYiS8lJ0ThTHGlPYRoWyR8jXC62XM l5SwCMDem7+8P/pejjNL1kUvgWDcvhvqPo2nGj5eahzpfUT6jCwtf4+D4JJiDwbxZ585 8qs6F1/k7sh09QSdaz8CSnrGSPZzQbFmNT4a4= 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=2ZIVHYCgJL3yRIi6SYczqkcDc7iwVPEmctKSmd2Crvc=; b=deg0Bg2LZTwrhvxUdbpfxWIy2JQUvLAODxDyf4M9jgO6vddZ0a15juXlPzDKV75GU1 ZH5rPO51xUELB6zktUFe636sbUHTrKIliDR/5+BoqlZgaPPYE+ku5Fn9VapWj4GnYPHO iYjPpbmfoix1OKEW50+fRRJliN44/KXoErcnOX+1uUcTQEQlRi3dvBS/mU1KNcF6P2Bn RHYdZ7VHIwbtdYsYPHfBX7gwxgeyv/cSgHAymTwBFi1aa+dXzApPynWcZrjgzxw3jBeP 0paJ8yDFgtTNxPkx45bRMl0gAlr32XWezFmzOxXBXwsgmcC4cc0V1MzB15MY1kmk5W+t KPxg== X-Gm-Message-State: APjAAAUEjNv2+tA7v2o3O55Nzb4qrZewL12cr+BKjdwTZbG/DLxPcrTG Nfiis14kvUWIM+jsw8Hu5LE= X-Google-Smtp-Source: APXvYqxf45Rt48qewS/1TxXy9teNni48bxwe3+YaybaZjyCTXYiBUvRLNPvO6nnYPvEQInHLi90qmA== X-Received: by 2002:a17:90a:3aed:: with SMTP id b100mr7900731pjc.63.1562888673741; Thu, 11 Jul 2019 16:44:33 -0700 (PDT) Received: from joelaf.cam.corp.google.com ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id t10sm6163450pjr.13.2019.07.11.16.44.30 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 11 Jul 2019 16:44:32 -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 , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, oleg@redhat.com, "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 v1 5/6] x86/pci: Pass lockdep condition to pcm_mmcfg_list iterator Date: Thu, 11 Jul 2019 19:44:00 -0400 Message-Id: <20190711234401.220336-6-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog In-Reply-To: <20190711234401.220336-1-joel@joelfernandes.org> References: <20190711234401.220336-1-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 X-Virus-Scanned: ClamAV using ClamSMTP 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; From patchwork Thu Jul 11 23:44:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 11040941 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CF4201805 for ; Thu, 11 Jul 2019 23:44:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BD76D28B8A for ; Thu, 11 Jul 2019 23:44:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AFD7E28B90; Thu, 11 Jul 2019 23:44:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 639C228B8A for ; Thu, 11 Jul 2019 23:44:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730533AbfGKXoj (ORCPT ); Thu, 11 Jul 2019 19:44:39 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:36865 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730524AbfGKXoi (ORCPT ); Thu, 11 Jul 2019 19:44:38 -0400 Received: by mail-pf1-f196.google.com with SMTP id 19so3466635pfa.4 for ; Thu, 11 Jul 2019 16:44:37 -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=9hScIZHsJmciYgxW3aaEACdipTjQ9ZhOMfEnTUSyg1Q=; b=kUZQBreXwSQ3LNMpnqWvxcf4z6FWwsyIribYH6vlDIlwsM/srzaOqB8hIC628Mxbpi sTEAQ/xS3ImmQx1BNXkDBgZwF5VYl6hRzaTcO42erW/MK6aBa4x3s17KPW5cbQUHnjAY AwCUMvXSnmIzqwu3/UeH7anXY4KB+DD3eYa0o= 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=9hScIZHsJmciYgxW3aaEACdipTjQ9ZhOMfEnTUSyg1Q=; b=k+Mg9zuM8XrZ9Z8CbB1qQWaGs6AzkR0hN0JIIf0PBn5OOcSatYvOB5/RfOmt/vuAZ4 GI8IPmCI/I35FI4xEHXZYu5dXIfsNNdr4wo7r+1ToL9VAFInjl669ARqp97p4SKhTYH/ 2PPoYl4CkbI5VnUB0ltf/6oby9ILkaBNOo4LKWSBEAhiip5aYlu+fVAlbnAxGe2bPZZh j9U/pVMmX6QGZ/qLC59T6mTBCGMwm00kfIN0R+kizh4l5rRGbECMWvlNv1S7afA0+ZKx 9YGUHqeqR7TUadgPWt0SLDcqXL8f4uap1bkn8pmPPD3J09I3n9GGLVexqr/mI8WabOkX 4KMw== X-Gm-Message-State: APjAAAXusJXtZr2Q4FWxwaO5r5gle5jbpE1AESbmKy42bgee8gHWrZSD LEYQTSGOJI5egg4UmRpTiko= X-Google-Smtp-Source: APXvYqxSDqyaeYYrrky8TWDPKqAGIx032RS1Jxow1lqnbITQYU3SZG4CMrefnUWSiviXF9o7KBA/IQ== X-Received: by 2002:a17:90a:8a15:: with SMTP id w21mr7864165pjn.134.1562888677430; Thu, 11 Jul 2019 16:44:37 -0700 (PDT) Received: from joelaf.cam.corp.google.com ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id t10sm6163450pjr.13.2019.07.11.16.44.33 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 11 Jul 2019 16:44:36 -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 , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, oleg@redhat.com, "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 v1 6/6] acpi: Use built-in RCU list checking for acpi_ioremaps list Date: Thu, 11 Jul 2019 19:44:01 -0400 Message-Id: <20190711234401.220336-7-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog In-Reply-To: <20190711234401.220336-1-joel@joelfernandes.org> References: <20190711234401.220336-1-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 X-Virus-Scanned: ClamAV using ClamSMTP list_for_each_entry_rcu has built-in RCU and lock checking. Make use of it for acpi_ioremaps list traversal. Signed-off-by: Joel Fernandes (Google) --- drivers/acpi/osl.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index f29e427d0d1d..c8b5d712c7ae 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include #include @@ -94,6 +95,7 @@ struct acpi_ioremap { static LIST_HEAD(acpi_ioremaps); static DEFINE_MUTEX(acpi_ioremap_lock); +#define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map) static void __init acpi_request_region (struct acpi_generic_address *gas, unsigned int length, char *desc) @@ -220,7 +222,7 @@ acpi_map_lookup(acpi_physical_address phys, acpi_size size) { struct acpi_ioremap *map; - list_for_each_entry_rcu(map, &acpi_ioremaps, list) + list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held()) if (map->phys <= phys && phys + size <= map->phys + map->size) return map; @@ -263,7 +265,7 @@ acpi_map_lookup_virt(void __iomem *virt, acpi_size size) { struct acpi_ioremap *map; - list_for_each_entry_rcu(map, &acpi_ioremaps, list) + list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held()) if (map->virt <= virt && virt + size <= map->virt + map->size) return map;