From patchwork Mon Feb 24 08:43:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roger Pau Monne X-Patchwork-Id: 11399495 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1759C14BC for ; Mon, 24 Feb 2020 08:46:06 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 E869F2072D for ; Mon, 24 Feb 2020 08:46:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=citrix.com header.i=@citrix.com header.b="FSqjb6iE" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E869F2072D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=citrix.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1j69Lv-0001jL-ET; Mon, 24 Feb 2020 08:44:35 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1j69Lu-0001jG-3l for xen-devel@lists.xenproject.org; Mon, 24 Feb 2020 08:44:34 +0000 X-Inumbo-ID: e050d085-56e1-11ea-8ad0-12813bfff9fa Received: from esa1.hc3370-68.iphmx.com (unknown [216.71.145.142]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id e050d085-56e1-11ea-8ad0-12813bfff9fa; Mon, 24 Feb 2020 08:44:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1582533874; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=JuCCVVgnrWXVejqbrIVufrfhXTXZmdgSEZneJfJ98sA=; b=FSqjb6iEHCsY/FlTwkRYby+eJLBqLbte/i5Iaw1/PQalYPWRIpeI6bcj lqkGuoww57FMPCVorpxj42MxHNefe/m2L5fMaiARPuJd42dpTUR5fJCix Q+i2apJOkmpMNfwMOCNBy4TVFQvQaDzerkxbC8XRgV5pLN/4ZVVF+JZ/e o=; Authentication-Results: esa1.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none; spf=None smtp.pra=roger.pau@citrix.com; spf=Pass smtp.mailfrom=roger.pau@citrix.com; spf=None smtp.helo=postmaster@mail.citrix.com Received-SPF: None (esa1.hc3370-68.iphmx.com: no sender authenticity information available from domain of roger.pau@citrix.com) identity=pra; client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="roger.pau@citrix.com"; x-conformance=sidf_compatible Received-SPF: Pass (esa1.hc3370-68.iphmx.com: domain of roger.pau@citrix.com designates 162.221.158.21 as permitted sender) identity=mailfrom; client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="roger.pau@citrix.com"; x-conformance=sidf_compatible; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133 ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4 ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88 ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83 ip4:168.245.78.127 ~all" Received-SPF: None (esa1.hc3370-68.iphmx.com: no sender authenticity information available from domain of postmaster@mail.citrix.com) identity=helo; client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: bLYs9s+YeAsJCws5fzTCtkwhs+qBn8mRlTacvxg+YUapMI/Zf4ZWXAUpStQT1vlculel9ll/xy GmynDeH1T0zvyyJaplu973oZssfvUrnJZzc9ycRUbopEFHlayAJG5He8kH9JfwXsbEq0cWJ+yU nje6VFGa5WcOMHnEXwFayEOoqZnT/kZqjZf+0FQEjA8rLSu/zhJzvnO9yOyVepONnqshe5jxqt N4xomrT3m0a6unp2A/hE84+jNK2bJ8kAD18SJQHetxZ3AlubTKSrYGbS3ilLUL83nENpj1FiIy GAk= X-SBRS: 2.7 X-MesageID: 13072148 X-Ironport-Server: esa1.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.70,479,1574139600"; d="scan'208";a="13072148" From: Roger Pau Monne To: Date: Mon, 24 Feb 2020 09:43:58 +0100 Message-ID: <20200224084400.94482-1-roger.pau@citrix.com> X-Mailer: git-send-email 2.25.0 MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v3 0/2] rwlock: allow recursive read locking when already locked in write mode X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Julien Grall , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Jan Beulich , Volodymyr Babchuk , Roger Pau Monne Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Hello, The following series implement support for read-locking a lock already taken in write mode by the same CPU. Patch #1 add an atomic_and operation to be used by patch #2 which implements the mentioned behavior. The series has been build tested on Arm by gitlab: https://gitlab.com/xen-project/people/royger/xen/pipelines/120144901 Thanks, Roger. Roger Pau Monne (2): atomic: add atomic_and operations rwlock: allow recursive read locking when already locked in write mode xen/common/rwlock.c | 4 +-- xen/include/asm-arm/arm32/atomic.h | 17 ++++++++++ xen/include/asm-arm/arm64/atomic.h | 14 ++++++++ xen/include/asm-x86/atomic.h | 8 +++++ xen/include/xen/rwlock.h | 52 ++++++++++++++++++------------ 5 files changed, 73 insertions(+), 22 deletions(-)