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[209.132.180.67]) by mx.google.com with ESMTP id m39si8189242plg.315.2019.01.08.01.12.31; Tue, 08 Jan 2019 01:12:48 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727944AbfAHJKE (ORCPT + 99 others); Tue, 8 Jan 2019 04:10:04 -0500 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:33666 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727367AbfAHJKD (ORCPT ); Tue, 8 Jan 2019 04:10:03 -0500 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-186-rRWwsNhmMgKmu7DXzJqGdA-1; Tue, 08 Jan 2019 09:09:55 +0000 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 8 Jan 2019 09:10:23 +0000 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Tue, 8 Jan 2019 09:10:23 +0000 From: David Laight To: 'Linus Torvalds' CC: Andrew Lutomirski , "dvlasenk@redhat.com" , Jens Axboe , Ingo Molnar , Thomas Gleixner , Ingo Molnar , "bp@alien8.de" , Peter Anvin , the arch/x86 maintainers , Andrew Morton , Peter Zijlstra , "brgerst@gmail.com" , Linux List Kernel Mailing , "pabeni@redhat.com" Subject: RE: [PATCH] x86: only use ERMS for user copies for larger sizes Thread-Topic: [PATCH] x86: only use ERMS for user copies for larger sizes Thread-Index: AQHUgaBY0KBBfG3q00apJLDxEV5GB6VcD8pwgAAXuEiAAPNRcIAAB5wwgABvjYCABE4VAIA+XC8AgAOb8vCAAIWbgIAAAOtA Date: Tue, 8 Jan 2019 09:10:22 +0000 Message-ID: <9e479981e09b4bebaaf6bc7f81c7bb59@AcuMS.aculab.com> References: <02bfc577-32a5-66be-64bf-d476b7d447d2@kernel.dk> <20181121063609.GA109082@gmail.com> <48e27a3a-2bb2-ff41-3512-8aeb3fd59e57@kernel.dk> <26eff539-7de7-784c-0c88-f1d30753299d@redhat.com> <7ea44458b90b4d41a08ba9012818d273@AcuMS.aculab.com> <64fd67993af04579b5262c270a7a4694@AcuMS.aculab.com> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: 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 X-MC-Unique: rRWwsNhmMgKmu7DXzJqGdA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMDcgSmFudWFyeSAyMDE5IDE3OjQ0DQo+IE9u IE1vbiwgSmFuIDcsIDIwMTkgYXQgMTo1NSBBTSBEYXZpZCBMYWlnaHQgPERhdmlkLkxhaWdodEBh Y3VsYWIuY29tPiB3cm90ZToNCj4gPg0KPiA+IEkgbmVlZGVkIHRvIG9wZW4tY29kZSBvbmUgcGFy dCBiZWNhdXNlIGl0IHdhbnRzIHRvIGRvIGNvcHlfdG9fdXNlcigpDQo+ID4gZnJvbSBhIFBDSWUg YWRkcmVzcyBidWZmZXIgKHdoaWNoIGhhcyB0byB3b3JrKS4NCj4gDQo+IEl0IHdpbGwgbmV2ZXIg d29yayBmb3IgbWVtY3B5X2Zyb21pbygpLiBBbnkgZHJpdmVyIHRoYXQgdGhpbmtzIGl0IHdpbGwN Cj4gY29weSBmcm9tIGlvIHNwYWNlIHRvIHVzZXIgc3BhY2UgYWJzb2x1dGVseSAqaGFzKiB0byBk byBpdCBieSBoYW5kLiBObw0KPiBxdWVzdGlvbnMsIGFuZCBubyBleGNlcHRpb25zLiBTb21lIGxv b3AgbGlrZQ0KPiANCj4gICAgZm9yICguLikNCj4gICAgICAgcHV0X3VzZXIocmVhZGwoaW9tZW0r KyksIHVhZGRyKyspOw0KPiANCj4gYmVjYXVzZSBuZWl0aGVyIGNvcHlfdG9fdXNlcigpIG5vciBt ZW1jcHlfZnJvbWlvKCkgd2lsbCAqZXZlciogaGFuZGxlDQo+IHRoYXQgY29ycmVjdGx5Lg0KPiAN Cj4gVGhleSBtaWdodCByYW5kb21seSBoYXBwZW4gdG8gd29yayBvbiB4ODYsIGJ1dCBhYnNvbHV0 ZWx5IG5vd2hlcmUgZWxzZS4NCg0KQWN0dWFsbHkgdGhleSB0ZW5kIHRvIGhhbmRsZSBpdCBvbiBh IGxvdCBvZiBzeXN0ZW1zLg0KKEJ1dCBJIGRvbid0IGRvIGl0LikNClByb2JhYmx5IG1vc3Qgb2Yg dGhvc2Ugd2hlcmUgdm1faW9tYXBfbWVtb3J5KCkgKHRvIG1hcCBJTyBtZW1vcnkNCnNwYWNlIGRp cmVjdGx5IGludG8gdXNlciBwYWdlcykgd29ya3MuDQoNCkl0IG1pZ2h0IGJlICdpbnRlcmVzdGlu ZycgdG8gYnVpbGQgYW4gYW1kNjQga2VybmVsIHdoZXJlIGFsbCB0aGUgSU8NCm1lbW9yeSBhZGRy ZXNzZXMgKGVnIHJldHVybmVkIGJ5IHBjaV9pb21hcCgpKSBhcmUgb2Zmc2V0IGJ5IGENCmxhcmdl IGNvbnN0YW50IHNvIGRpcmVjdCBhY2Nlc3NlcyBhbGwgZmF1bHQgYW5kIGFsbCB0aGUgcmVhZGwo KQ0KbWFjcm9zIChldGMpIGFkZCBpdCBiYWNrIGluLg0KDQoJRGF2aWQNCg0KLQ0KUmVnaXN0ZXJl ZCBBZGRyZXNzIExha2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0sIE1pbHRvbiBLZXlu ZXMsIE1LMSAxUFQsIFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdhbGVzKQ0K