From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751236AbdJCSks (ORCPT ); Tue, 3 Oct 2017 14:40:48 -0400 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:22949 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750820AbdJCSkq (ORCPT ); Tue, 3 Oct 2017 14:40:46 -0400 X-IronPort-AV: E=Sophos;i="5.42,474,1500912000"; d="scan'208";a="56522005" From: Bart Van Assche To: "linux-scsi@vger.kernel.org" , "hch@infradead.org" , "jejb@linux.vnet.ibm.com" , "linux-block@vger.kernel.org" , "axboe@fb.com" , "ming.lei@redhat.com" , "martin.petersen@oracle.com" CC: "linux-kernel@vger.kernel.org" , "jthumshirn@suse.de" , "martin@lichtvoll.de" , Bart Van Assche , "oleksandr@natalenko.name" , "hare@suse.com" , "tj@kernel.org" , "cavery@redhat.com" Subject: Re: [PATCH V8 5/8] percpu-refcount: introduce __percpu_ref_tryget_live Thread-Topic: [PATCH V8 5/8] percpu-refcount: introduce __percpu_ref_tryget_live Thread-Index: AQHTPFC3cgmjnLbf7U6ACYuXCBstEqLSdYOA Date: Tue, 3 Oct 2017 18:40:24 +0000 Message-ID: <1507056023.2567.1.camel@wdc.com> References: <20171003140406.26060-1-ming.lei@redhat.com> <20171003140406.26060-6-ming.lei@redhat.com> In-Reply-To: <20171003140406.26060-6-ming.lei@redhat.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Bart.VanAssche@wdc.com; x-originating-ip: [63.163.107.100] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;CY1PR0401MB1534;20:IuAneQ4LkBeTvN7r50nKVJevh6YEhFhFD78Z0I4ovY+MzeH60aWM3wI3J96T/wpvjtlAzDFzFxWTCavJUinusVAJhd5l0lc9g9tvL4QY2aCuEJlU1QWk1yudCKwQOGnXyIYY8fNplUmfv3AXtClvRhRYDVGg1kU6S0Cd7NW1pUg= x-ms-exchange-antispam-srfa-diagnostics: SSOS;SSOR; x-ms-office365-filtering-correlation-id: e11ca3c8-4e01-403f-745e-08d50a8e3614 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(22001)(2017030254152)(48565401081)(2017052603199)(201703131423075)(201703031133081)(201702281549075);SRVR:CY1PR0401MB1534; x-ms-traffictypediagnostic: CY1PR0401MB1534: wdcipoutbound: EOP-TRUE x-exchange-antispam-report-test: UriScan:; x-microsoft-antispam-prvs: x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(100000700101)(100105000095)(100000701101)(100105300095)(100000702101)(100105100095)(6040450)(2401047)(8121501046)(5005006)(3002001)(10201501046)(100000703101)(100105400095)(93006095)(93001095)(6055026)(6041248)(201703131423075)(201702281528075)(201703061421075)(201703061406153)(20161123562025)(20161123560025)(20161123555025)(20161123558100)(20161123564025)(6072148)(201708071742011)(100000704101)(100105200095)(100000705101)(100105500095);SRVR:CY1PR0401MB1534;BCL:0;PCL:0;RULEID:(100000800101)(100110000095)(100000801101)(100110300095)(100000802101)(100110100095)(100000803101)(100110400095)(100000804101)(100110200095)(100000805101)(100110500095);SRVR:CY1PR0401MB1534; x-forefront-prvs: 044968D9E1 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(6009001)(346002)(376002)(39860400002)(377424004)(189002)(24454002)(199003)(81156014)(4326008)(68736007)(189998001)(478600001)(305945005)(6506006)(7736002)(6512007)(2201001)(3660700001)(72206003)(53936002)(316002)(2906002)(7416002)(76176999)(50986999)(66066001)(54356999)(5660300001)(14454004)(103116003)(110136005)(3280700002)(101416001)(99286003)(54906003)(2501003)(558084003)(86362001)(3846002)(102836003)(6116002)(77096006)(2900100001)(106356001)(105586002)(2950100002)(8676002)(81166006)(36756003)(6436002)(6246003)(97736004)(8936002)(33646002)(25786009)(229853002)(6486002);DIR:OUT;SFP:1102;SCL:1;SRVR:CY1PR0401MB1534;H:CY1PR0401MB1536.namprd04.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;MX:1;A:1;LANG:en; spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" Content-ID: <38175416393C7E4EA25848CE4682D962@namprd04.prod.outlook.com> MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Oct 2017 18:40:24.9705 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR0401MB1534 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by nfs id v93IerXP011887 On Tue, 2017-10-03 at 22:04 +0800, Ming Lei wrote: > Block layer need to call this function after holding > rcu lock in a real hot path, so introduce this helper. Since it is allowed to nest rcu_read_lock_sched() calls I don't think that this patch is necessary. Bart.