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[23.128.96.18]) by mx.google.com with ESMTP id v23si19224799edy.109.2021.07.13.03.44.52; Tue, 13 Jul 2021 03:45:15 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=aculab.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235765AbhGMKoW (ORCPT + 99 others); Tue, 13 Jul 2021 06:44:22 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:21000 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235748AbhGMKoV (ORCPT ); Tue, 13 Jul 2021 06:44:21 -0400 Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-195-YcZhAG2bMUqc6APF1V5etQ-1; Tue, 13 Jul 2021 11:41:28 +0100 X-MC-Unique: YcZhAG2bMUqc6APF1V5etQ-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) by AcuMS.aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) with Microsoft SMTP Server (TLS) id 15.0.1497.18; Tue, 13 Jul 2021 11:41:26 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.018; Tue, 13 Jul 2021 11:41:26 +0100 From: David Laight To: 'Jens Axboe' , yaozhenguo , "oleg@redhat.comm" CC: "linux-kernel@vger.kernel.org" , "yaozhenguo@jd.com" Subject: RE: [PATCH] task_work: return -EBUSY when adding same work Thread-Topic: [PATCH] task_work: return -EBUSY when adding same work Thread-Index: AQHXdM1OJOja+KCFTU2lU5NJFMx/zqtAvCEQ Date: Tue, 13 Jul 2021 10:41:26 +0000 Message-ID: <3079d213543c4d398d96031e6da26c82@AcuMS.aculab.com> References: <20210709122712.42844-1-yaozhenguo1@gmail.com> <872612b5-b9c6-43aa-a167-1c204d0f1c5a@kernel.dk> In-Reply-To: <872612b5-b9c6-43aa-a167-1c204d0f1c5a@kernel.dk> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogSmVucyBBeGJvZQ0KPiBTZW50OiAwOSBKdWx5IDIwMjEgMTU6MTgNCi4uLg0KPiA+ICAg Ki8NCj4gPiAgaW50IHRhc2tfd29ya19hZGQoc3RydWN0IHRhc2tfc3RydWN0ICp0YXNrLCBzdHJ1 Y3QgY2FsbGJhY2tfaGVhZCAqd29yaywNCj4gPiAgCQkgIGVudW0gdGFza193b3JrX25vdGlmeV9t b2RlIG5vdGlmeSkNCj4gPiBAQCAtNDEsNiArNDEsOCBAQCBpbnQgdGFza193b3JrX2FkZChzdHJ1 Y3QgdGFza19zdHJ1Y3QgKnRhc2ssIHN0cnVjdCBjYWxsYmFja19oZWFkICp3b3JrLA0KPiA+ICAJ CWhlYWQgPSBSRUFEX09OQ0UodGFzay0+dGFza193b3Jrcyk7DQo+ID4gIAkJaWYgKHVubGlrZWx5 KGhlYWQgPT0gJndvcmtfZXhpdGVkKSkNCj4gPiAgCQkJcmV0dXJuIC1FU1JDSDsNCj4gPiArCQlp ZiAodW5saWtlbHkoaGVhZCA9PSB3b3JrKSkNCj4gPiArCQkJcmV0dXJuIC1FQlVTWTsNCj4gPiAg CQl3b3JrLT5uZXh0ID0gaGVhZDsNCj4gPiAgCX0gd2hpbGUgKGNtcHhjaGcoJnRhc2stPnRhc2tf d29ya3MsIGhlYWQsIHdvcmspICE9IGhlYWQpOw0KPiANCj4gSSBkb24ndCB0aGluayB0aGVyZSdz IGFueXRoaW5nIGNvbmNlcHR1YWxseSB3cm9uZyB3aXRoIHRoaXMgcGF0Y2gsIGJ1dA0KPiBpdCBt YWtlcyBtZSB0aGluayB0aGF0IHlvdSBoaXQgdGhpcyBjb25kaXRpb24uIEl0J3MgcmVhbGx5IGEg YnVnIGluIHRoZQ0KPiBjYWxsZXIsIG9mIGNvdXJzZSwgaXMgYSBXQVJOX09OX09OQ0UoKSB3YXJy YW50ZWQgaGVyZT8gQW5kIHdobyB3YXMgdGhlDQo+IGNhbGxlcj8NCg0KSG93IGNhbiB0aGUgY2Fs bGVyIGtub3cgdGhhdCB0aGUgdGFzayBpcyBvbiB0aGUgcXVldWU/DQoNClRoZXJlIHdpbGwgYmUg YSByYWNlIGNvbmRpdGlvbiBqdXN0IGJlZm9yZSB0aGUgd29yayBmdW5jdGlvbg0KaXMgY2FsbGVk IGFuZC9vciBqdXN0IGFmdGVyIGl0IHJldHVybnMgdGhhdCB0aGUgY2FsbGVyDQpjYW4ndCBkZXRl Y3QuDQpUaGUgY2hlY2sgbmVlZHMgdG8gYmUgZG9uZSBhdG9taWNhbGx5IHdpdGggdGhlIGNvZGUg dGhhdA0KcmVtb3ZlcyB0aGUgd29yayBpdGVtIGZyb20gdGhlIGxpc3QuDQoNCglEYXZpZA0KDQot DQpSZWdpc3RlcmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1sZXkgUm9hZCwgTW91bnQgRmFybSwg TWlsdG9uIEtleW5lcywgTUsxIDFQVCwgVUsNClJlZ2lzdHJhdGlvbiBObzogMTM5NzM4NiAoV2Fs ZXMpDQo=