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,URIBL_BLOCKED,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 32C03C0650F for ; Thu, 8 Aug 2019 19:53:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 06B4A218BA for ; Thu, 8 Aug 2019 19:53:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565294000; bh=aHv2LDiaGN7dEQiNuFUXYzjr+42/lR/ICUScbvMgjZE=; h=From:To:Subject:Date:In-Reply-To:References:In-Reply-To: References:List-ID:From; b=pZCnhuA8NxAChZJeu7hOfd6T3pXQBlUdjWNyzIR1GVRqkrxbzjV8kyVgQe//W545+ PSytbAT/AOkU8f7p6KNUNkaTjZZhRp0PrXrFervr6qf9/orYm1tQ8B9VBGrt61di3F ZRIabHifni07ebWs6+s3tMWAgXUZBTgIu+CNNPNY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404467AbfHHTxS (ORCPT ); Thu, 8 Aug 2019 15:53:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:57980 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404353AbfHHTxQ (ORCPT ); Thu, 8 Aug 2019 15:53:16 -0400 Received: from localhost.localdomain (c-98-220-238-81.hsd1.il.comcast.net [98.220.238.81]) (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 5773A218B0; Thu, 8 Aug 2019 19:53:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565293996; bh=aHv2LDiaGN7dEQiNuFUXYzjr+42/lR/ICUScbvMgjZE=; h=From:To:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=qRwYvhYQnb7Je8j2HVjxJydJ5BQhQeewfuvHP64AfiIS4ALF3n3k+nAwR1TvP7UxO hLwxo+fTyElm9vAQ8dzH68nls1ocxGI2bIbNaU5HA2vm7KGQ/cIahA2Ih4g4OnsdiQ 5z4kw5bZfv30m7KTQxIGAYmN8wEXl2wC2HGQWjic= From: zanussi@kernel.org To: LKML , linux-rt-users , Steven Rostedt , Thomas Gleixner , Carsten Emde , John Kacur , Sebastian Andrzej Siewior , Daniel Wagner , Tom Zanussi , Julia Cartwright Subject: [PATCH RT 07/19] locking/lockdep: Don't complain about incorrect name for no validate class Date: Thu, 8 Aug 2019 14:52:35 -0500 Message-Id: <6a31ace7aff17a469ea5f390c8b2ae61695b7159.1565293934.git.zanussi@kernel.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org From: Sebastian Andrzej Siewior v4.14.137-rt65-rc1 stable review patch. If anyone has any objections, please let me know. ----------- [ Upstream commit 978315462d3ea3cf6cfacd34c563ec1eb02a3aa5 ] It is possible to ignore the validation for a certain lock by using: lockdep_set_novalidate_class() on it. Each invocation will assign a new name to the class it created for created __lockdep_no_validate__. That means that once lockdep_set_novalidate_class() has been used on two locks then class->name won't match lock->name for the first lock triggering the warning. So ignore changed non-matching ->name pointer for the special __lockdep_no_validate__ class. Signed-off-by: Sebastian Andrzej Siewior Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Will Deacon Link: http://lkml.kernel.org/r/20190517212234.32611-1-bigeasy@linutronix.de Signed-off-by: Ingo Molnar Signed-off-by: Tom Zanussi --- kernel/locking/lockdep.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index e576d234f3ea..f194de27123d 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -719,7 +719,8 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass) * Huh! same key, different name? Did someone trample * on some memory? We're most confused. */ - WARN_ON_ONCE(class->name != lock->name); + WARN_ON_ONCE(class->name != lock->name && + lock->key != &__lockdep_no_validate__); return class; } } -- 2.14.1