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[23.128.96.18]) by mx.google.com with ESMTP id k3si2255966edi.75.2021.05.27.07.08.41; Thu, 27 May 2021 07:09:11 -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 S235210AbhE0OHw (ORCPT + 99 others); Thu, 27 May 2021 10:07:52 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:20069 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235830AbhE0OHs (ORCPT ); Thu, 27 May 2021 10:07:48 -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-213-_LxrmOtvOk6JvNjGgzt_rQ-1; Thu, 27 May 2021 15:06:11 +0100 X-MC-Unique: _LxrmOtvOk6JvNjGgzt_rQ-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 15.0.1497.2; Thu, 27 May 2021 15:06:10 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.015; Thu, 27 May 2021 15:06:10 +0100 From: David Laight To: 'Russell King' , =?utf-8?B?S3J6eXN6dG9mIEhhxYJhc2E=?= CC: linux-arm-kernel , lkml Subject: RE: Data corruption on i.MX6 IPU in arm_copy_from_user() Thread-Topic: Data corruption on i.MX6 IPU in arm_copy_from_user() Thread-Index: AQHXUjGwIzSVMSwtw06DpfGoZiumlar3XR+w Date: Thu, 27 May 2021 14:06:10 +0000 Message-ID: References: <20210526100843.GD30436@shell.armlinux.org.uk> <20210526131853.GE30436@shell.armlinux.org.uk> In-Reply-To: <20210526131853.GE30436@shell.armlinux.org.uk> 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 RnJvbTogUnVzc2VsbCBLaW5nIDxsaW51eEBhcm1saW51eC5vcmcudWs+DQo+IFNlbnQ6IDI2IE1h eSAyMDIxIDE0OjE5DQo+IA0KPiBPbiBXZWQsIE1heSAyNiwgMjAyMSBhdCAwMjoyOTowN1BNICsw MjAwLCBLcnp5c3p0b2YgSGHFgmFzYSB3cm90ZToNCj4gPiAiUnVzc2VsbCBLaW5nIChPcmFjbGUp IiA8bGludXhAYXJtbGludXgub3JnLnVrPiB3cml0ZXM6DQo+ID4NCj4gPiA+IFN1cmVseSBzb21l b25lIGlzIG5vdCB1c2luZyBjb3B5XypfdXNlcigpIHRvIGNvcHkgZGF0YSBmcm9tIHVzZXJzcGFj ZQ0KPiA+ID4gZGlyZWN0IHRvIE1NSU8gc3BhY2UuLi4gdGhhdCB3b3VsZCBiZSBjcmF6eS4NCj4g Pg0KPiA+IE5vLCBpdCdzIHRoZSBvdGhlciB3YXkgYXJvdW5kOiByZWFkaW5nIE1NSU8gbWFwcGVk IHRvIHVzZXJzcGFjZSAobW1hcA0KPiA+IG9uIC9kZXYvbWVtKSBhbmQgY29weWluZyBpdCB0byBz aW1wbGUga2VybmVsIGJ1ZmZlciAoZS5nLiBwaXBlIGJ1ZmZlcikuDQo+ID4gSS5lLiwgdGhlIE1N SU8gaXMgdGhlIHVzZXJzcGFjZSBoZXJlICh0aHVzIGNvcHlfZnJvbV91c2VyKCkpLg0KPiANCj4g QWguIEkgdGhpbmsgd2UgYXNzdW1lIGNvcHlfZnJvbV91c2VyKCkgd2lsbCBiZSB1c2VkIG9uIG1l bW9yeSBvbmx5IGFuZA0KPiBub3QgZGV2aWNlIG1hcHBpbmdzLg0KPiANCj4gSW4gYW55IGNhc2Us IGxvb2tpbmcgYXQgdGhlIGFyY2hpdGVjdHVyZSByZWZlcmVuY2UgbWFudWFsLCBMRE0gaXMNCj4g cGVybWl0dGVkIG9uIGRldmljZSBhbmQgc3Ryb25nbHkgb3JkZXJlZCBtYXBwaW5ncywgYW5kIHRo ZSBtZW1vcnkNCj4gc3Vic3lzdGVtIGlzIHJlcXVpcmVkIHRvIGRlY29tcG9zZSBpdCBpbnRvIGEg c2VyaWVzIG9mIDMyLWJpdCBhY2Nlc3Nlcy4NCj4gU28sIGl0IHNvdW5kcyB0byBtZSBsaWtlIHRo ZXJlIGNvdWxkIGJlIGEgaGFyZHdhcmUgYnVnIGluIHRoZSBidXNlcy9JUFUNCj4gY2F1c2luZyB0 aGlzLg0KPiANCj4gQ2FuIHlvdSB0cnkgdXNpbmcgTERNIGRpcmVjdGx5IGluc2lkZSB0aGUga2Vy bmVsIGFuZCBzZWVpbmcgd2hhdCBlZmZlY3QNCj4gaXQgaGFzIHdoZW4gcmVhZGluZyB0aGUgSVBV PyBBIHNpbXBsZSB0ZXN0IG1vZHVsZSBzaG91bGQgYmUgc3VmZmljaWVudC4NCj4gSSBzdXNwZWN0 IGl0J2xsIHNob3cgdGhlIHNhbWUgdGhpbmcgLSBiYXNpY2FsbHksIHRoYXQgdXNpbmcgTERNIHRv IHRoZQ0KPiBJUFUgaXMgYnJva2VuLg0KDQpJIHdhcyB3b25kZXJpbmcgaWYgdGhlcmUgaXMgc29t ZSBraW5kIG9mIHBhZ2UgZmF1bHQgb24gdGhlIGZpcnN0IGFjY2Vzcz8NCg0KV2hhdCBoYXBwZW5z IGlmIHlvdSByZXBlYXQgdGhlIHdyaXRlKCkgPw0KDQpGV0lXIHlvdSBkb24ndCB3YW50IHRvIHRy eSB0aGlzIG9uIHg4Ni4NClRoZSBNTUlPIGFkZHJlc3NlcyBhcmUgbGlrZWx5IHRvIGJlIHVuY2Fj aGVkIGJ1dCB0aGUgY29weQ0KZnVuY3Rpb24gaXMgbGlrZWx5IHRvIGRlY2lkZSB0byB1c2UgdGhl IEVSTVMgJ3JlcCBtb3ZzYicgc28NCnN1ZGRlbmx5IHlvdSBnZXQgc2luZ2xlIGJ5dGUgUENJZSBy ZWFkcyENCldoYXQgeW91IHJlYWxseSB3YW50IGlzIHRoZSBsYXJnZXN0IEFWWCByZWdpc3RlciBh dmFpbGFibGUuDQoNCglEYXZpZA0KDQotDQpSZWdpc3RlcmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJy YW1sZXkgUm9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtleW5lcywgTUsxIDFQVCwgVUsNClJlZ2lz dHJhdGlvbiBObzogMTM5NzM4NiAoV2FsZXMpDQo=