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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF061C433FE for ; Mon, 15 Nov 2021 23:36:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC12461A40 for ; Mon, 15 Nov 2021 23:36:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244982AbhKOXj2 (ORCPT ); Mon, 15 Nov 2021 18:39:28 -0500 Received: from mail.kernel.org ([198.145.29.99]:44628 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343656AbhKOTVd (ORCPT ); Mon, 15 Nov 2021 14:21:33 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id A71B663316; Mon, 15 Nov 2021 18:44:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637001842; bh=eF3/QmgcPn7aRdWZs01+PigrocKT3mCZencTM3OuFsc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YuHvcPhBQ9VpLr/tN2PtwMRDLf55017yrPt1/1AdBSWNJlLuKU2JQ8fnr08L56hv5 RWEazwoqEJSnmCD4IkIlwHTRmPhEj+v3bFv9cdP7CMQ4KEQTlm8nprSHiecma78LkV xvf66u6FOOa7d7/0qAoCvW9nu76DHgKW4AewqUYE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sebastian Andrzej Siewior , "Peter Zijlstra (Intel)" , Boqun Feng , Waiman Long , Sasha Levin Subject: [PATCH 5.15 340/917] lockdep: Let lock_is_held_type() detect recursive read as read Date: Mon, 15 Nov 2021 17:57:15 +0100 Message-Id: <20211115165440.277101836@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165428.722074685@linuxfoundation.org> References: <20211115165428.722074685@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sebastian Andrzej Siewior [ Upstream commit 2507003a1d10917c9158077bf6030719d02c941e ] lock_is_held_type(, 1) detects acquired read locks. It only recognized locks acquired with lock_acquire_shared(). Read locks acquired with lock_acquire_shared_recursive() are not recognized because a `2' is stored as the read value. Rework the check to additionally recognise lock's read value one and two as a read held lock. Fixes: e918188611f07 ("locking: More accurate annotations for read_lock()") Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Peter Zijlstra (Intel) Acked-by: Boqun Feng Acked-by: Waiman Long Link: https://lkml.kernel.org/r/20210903084001.lblecrvz4esl4mrr@linutronix.de Signed-off-by: Sasha Levin --- kernel/locking/lockdep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 8a509672a4cc9..d624231eab2bb 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -5366,7 +5366,7 @@ int __lock_is_held(const struct lockdep_map *lock, int read) struct held_lock *hlock = curr->held_locks + i; if (match_held_lock(hlock, lock)) { - if (read == -1 || hlock->read == read) + if (read == -1 || !!hlock->read == read) return LOCK_STATE_HELD; return LOCK_STATE_NOT_HELD; -- 2.33.0