From nobody Sun Feb 8 16:30:45 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1568228915; cv=none; d=zoho.com; s=zohoarc; b=Z06T9rlhs8jbaqlpwZZPbilmNPeBbX9pWsGieYbKcupf56MITm57A/EvKiG4HyxhtuR9GaFDxC0vnGYj9asfWRmXClRojDJXg+nTEUyWRrwhtruettwAL57JRmjZdkvQLjLos05SjP6ueJZF6z4XT67ARWvkRHxD11E+VOgz6hM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1568228915; h=Content-Transfer-Encoding:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=jAef25erNpaQ6HqXvcEhHI2aqtbz+LHS5tFhXupRyB0=; b=jDNds0f3eJf/tx8pfOUuh2OUTij5UfFKmk5xb1n4S+rjz81bRP5kvohRBSmKczgZ+SEXLGCQYDqUJf5rx+RkimluiRqcoZm6yThnJ1YQc/Gm5qvqWIQd4vdfm+KGHePB2VutulUPwR4vbsothkydmCjRQci5xZUkawMnVl5iJSg= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1568228915344258.75245866982357; Wed, 11 Sep 2019 12:08:35 -0700 (PDT) Received: from localhost ([::1]:55644 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i87yg-0005WV-Ov for importer@patchew.org; Wed, 11 Sep 2019 15:08:30 -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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Daniel P. Berrang=C3=A9 --- 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, RCUCBFunc= *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