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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 D047FC49ED6 for ; Wed, 11 Sep 2019 19:08:11 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AB3AF2075C for ; Wed, 11 Sep 2019 19:08:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB3AF2075C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:55644 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i87yL-0005WV-Um for qemu-devel@archiver.kernel.org; Wed, 11 Sep 2019 15:08:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54070) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i87wj-0003xX-50 for qemu-devel@nongnu.org; Wed, 11 Sep 2019 15:06:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i87wi-0006aO-23 for qemu-devel@nongnu.org; Wed, 11 Sep 2019 15:06:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42322) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i87wh-0006Zq-Sy for qemu-devel@nongnu.org; Wed, 11 Sep 2019 15:06:28 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3DCD57EB88 for ; Wed, 11 Sep 2019 19:06:27 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-117-243.ams2.redhat.com [10.36.117.243]) by smtp.corp.redhat.com (Postfix) with ESMTP id 11B7160167; Wed, 11 Sep 2019 19:06:25 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, pbonzini@redhat.com, ehabkost@redhat.com, berrange@redhat.com, quintela@redhat.com Date: Wed, 11 Sep 2019 20:06:18 +0100 Message-Id: <20190911190622.7629-2-dgilbert@redhat.com> In-Reply-To: <20190911190622.7629-1-dgilbert@redhat.com> References: <20190911190622.7629-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.71]); Wed, 11 Sep 2019 19:06:27 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 1/5] rcu: Add automatically released rcu_read_lock variant X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: "Dr. David Alan Gilbert" RCU_READ_LOCK_AUTO takes the rcu_read_lock and then uses glib's g_auto infrastructure (and thus whatever the compiler's hooks are) to release it on all exits of the block. Signed-off-by: Dr. David Alan Gilbert --- include/qemu/rcu.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/qemu/rcu.h b/include/qemu/rcu.h index 22876d1428..8768a7b60a 100644 --- a/include/qemu/rcu.h +++ b/include/qemu/rcu.h @@ -154,6 +154,24 @@ extern void call_rcu1(struct rcu_head *head, RCUCBFu= nc *func); }), = \ (RCUCBFunc *)g_free); =20 +typedef void RCUReadAuto; +static inline RCUReadAuto *rcu_read_auto_lock(void) +{ + rcu_read_lock(); + /* Anything non-NULL causes the cleanup function to be called */ + return (void *)0x1; +} + +static inline void rcu_read_auto_unlock(RCUReadAuto *r) +{ + rcu_read_unlock(); +} + +G_DEFINE_AUTOPTR_CLEANUP_FUNC(RCUReadAuto, rcu_read_auto_unlock) + +#define RCU_READ_LOCK_AUTO \ + g_autoptr(RCUReadAuto) _rcu_read_auto =3D rcu_read_auto_lock() + #ifdef __cplusplus } #endif --=20 2.21.0