From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 27EB5602F for ; Wed, 20 Jul 2022 16:56:47 +0000 (UTC) Received: from fraeml706-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Lp1yp2Bl4z67FSP; Thu, 21 Jul 2022 00:54:58 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml706-chm.china.huawei.com (10.206.15.55) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2375.24; Wed, 20 Jul 2022 18:56:43 +0200 Received: from localhost (10.81.205.121) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Wed, 20 Jul 2022 17:56:42 +0100 Date: Wed, 20 Jul 2022 17:56:41 +0100 From: Jonathan Cameron To: Dan Williams CC: , , , Subject: Re: [PATCH v2 13/28] cxl/port: Move dport tracking to an xarray Message-ID: <20220720175641.00002665@Huawei.com> In-Reply-To: <165784331647.1758207.6345820282285119339.stgit@dwillia2-xfh.jf.intel.com> References: <165784324066.1758207.15025479284039479071.stgit@dwillia2-xfh.jf.intel.com> <165784331647.1758207.6345820282285119339.stgit@dwillia2-xfh.jf.intel.com> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.29; i686-w64-mingw32) Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.81.205.121] X-ClientProxiedBy: lhreml754-chm.china.huawei.com (10.201.108.204) To lhreml710-chm.china.huawei.com (10.201.108.61) X-CFilter-Loop: Reflected On Thu, 14 Jul 2022 17:01:56 -0700 Dan Williams wrote: > Reduce the complexity and the overhead of walking the topology to > determine endpoint connectivity to root decoder interleave > configurations. > > Note that cxl_detach_ep(), after it determines that the last @ep has > departed and decides to delete the port, now needs to walk the dport > array with the device_lock() held to remove entries. Previously > list_splice_init() could be used atomically delete all dport entries at > once and then perform entry tear down outside the lock. There is no > list_splice_init() equivalent for the xarray. > > Signed-off-by: Dan Williams Reviewed-by: Jonathan Cameron