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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 3067EC4646D for ; Sat, 11 Aug 2018 13:52:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C92AB217AE for ; Sat, 11 Aug 2018 13:52:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C92AB217AE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728238AbeHKQ0d (ORCPT ); Sat, 11 Aug 2018 12:26:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:39986 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727361AbeHKQYa (ORCPT ); Sat, 11 Aug 2018 12:24:30 -0400 Received: from gandalf.local.home (cpe-66-24-56-78.stny.res.rr.com [66.24.56.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4F05121B34; Sat, 11 Aug 2018 13:50:14 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.91) (envelope-from ) id 1foUHV-000677-AK; Sat, 11 Aug 2018 09:50:13 -0400 Message-Id: <20180811135013.219285446@goodmis.org> User-Agent: quilt/0.65 Date: Sat, 11 Aug 2018 09:49:42 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Peter Zijlstra , "Joel Fernandes (Google)" Subject: [for-next][PATCH 14/34] lockdep: Use this_cpu_ptr instead of get_cpu_var stats References: <20180811134928.034373761@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Joel Fernandes (Google)" get_cpu_var disables preemption which has the potential to call into the preemption disable trace points causing some complications. There's also no need to disable preemption in uses of get_lock_stats anyway since preempt is already disabled. So lets simplify the code. Link: http://lkml.kernel.org/r/20180730222423.196630-2-joel@joelfernandes.org Suggested-by: Peter Zijlstra Acked-by: Peter Zijlstra Signed-off-by: Joel Fernandes (Google) Signed-off-by: Steven Rostedt (VMware) --- kernel/locking/lockdep.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 5fa4d3138bf1..fbbb79d5cfa0 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -248,12 +248,7 @@ void clear_lock_stats(struct lock_class *class) static struct lock_class_stats *get_lock_stats(struct lock_class *class) { - return &get_cpu_var(cpu_lock_stats)[class - lock_classes]; -} - -static void put_lock_stats(struct lock_class_stats *stats) -{ - put_cpu_var(cpu_lock_stats); + return &this_cpu_ptr(cpu_lock_stats)[class - lock_classes]; } static void lock_release_holdtime(struct held_lock *hlock) @@ -271,7 +266,6 @@ static void lock_release_holdtime(struct held_lock *hlock) lock_time_inc(&stats->read_holdtime, holdtime); else lock_time_inc(&stats->write_holdtime, holdtime); - put_lock_stats(stats); } #else static inline void lock_release_holdtime(struct held_lock *hlock) @@ -4090,7 +4084,6 @@ __lock_contended(struct lockdep_map *lock, unsigned long ip) stats->contending_point[contending_point]++; if (lock->cpu != smp_processor_id()) stats->bounces[bounce_contended + !!hlock->read]++; - put_lock_stats(stats); } static void @@ -4138,7 +4131,6 @@ __lock_acquired(struct lockdep_map *lock, unsigned long ip) } if (lock->cpu != cpu) stats->bounces[bounce_acquired + !!hlock->read]++; - put_lock_stats(stats); lock->cpu = cpu; lock->ip = ip; -- 2.18.0