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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 4805BC43331 for ; Wed, 1 Apr 2020 16:52:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 17BC4206E9 for ; Wed, 1 Apr 2020 16:52:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585759979; bh=zI1L8fWuxnVasn0HN2osMoOEJhb/uWGdUVBR50usJHc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cJXutULgRS6kmR0HMzLugmsFhwYlsAel0QktbD6xDHdARjEjP4MTDkkshCVx0riMt ATh6ZiCBdtKnaicIY9nmmqrMNb5taOR7ylTlXGwFsDuze0hrVNx+0YW8KCUUmQwLmq bbsLNWLfKrpAWq1GjSntEJoLTUKLTz4C4EW1bkHE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732274AbgDAQwz (ORCPT ); Wed, 1 Apr 2020 12:52:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:60362 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388283AbgDAQdq (ORCPT ); Wed, 1 Apr 2020 12:33:46 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 22EF120658; Wed, 1 Apr 2020 16:33:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585758825; bh=zI1L8fWuxnVasn0HN2osMoOEJhb/uWGdUVBR50usJHc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dUT3xlbxXxI21O+OXBBVZukXKHsz9beg/darQMDeA5iNrfXVtT7ZTG6ZDw3x6Y8+Y VhjA7+bakiKJJ4RCXDugsA8u1Ru1n0opFkpSVo/IRdpQCPcmbVCNxHJI77ejYC+e2C dGmXT+CJm6b5suAakucdSTmlqqcglRGzJ9QRvb4I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Peter Zijlstra (Intel)" , Andrew Morton , Linus Torvalds , "Paul E. McKenney" , Thomas Gleixner , Ingo Molnar Subject: [PATCH 4.4 87/91] locking/atomic, kref: Add kref_read() Date: Wed, 1 Apr 2020 18:18:23 +0200 Message-Id: <20200401161539.844562724@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200401161512.917494101@linuxfoundation.org> References: <20200401161512.917494101@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Peter Zijlstra commit 2c935bc57221cc2edc787c72ea0e2d30cdcd3d5e upstream. Since we need to change the implementation, stop exposing internals. Provide kref_read() to read the current reference count; typically used for debug messages. Kills two anti-patterns: atomic_read(&kref->refcount) kref->refcount.counter Signed-off-by: Peter Zijlstra (Intel) Cc: Andrew Morton Cc: Greg Kroah-Hartman Cc: Linus Torvalds Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar [only add kref_read() to kref.h for stable backports - gregkh] Signed-off-by: Greg Kroah-Hartman --- include/linux/kref.h | 5 +++++ 1 file changed, 5 insertions(+) --- a/include/linux/kref.h +++ b/include/linux/kref.h @@ -33,6 +33,11 @@ static inline void kref_init(struct kref atomic_set(&kref->refcount, 1); } +static inline int kref_read(const struct kref *kref) +{ + return atomic_read(&kref->refcount); +} + /** * kref_get - increment refcount for object. * @kref: object.