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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:44444) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lmdaU-000063-FN; Fri, 28 May 2021 15:35:46 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1lmdaS-0004mG-TV; Fri, 28 May 2021 15:35:44 +0100 Date: Fri, 28 May 2021 15:35:44 +0100 From: "Russell King (Oracle)" To: Krzysztof =?utf-8?Q?Ha=C5=82asa?= Cc: linux-arm-kernel , lkml Subject: Re: Data corruption on i.MX6 IPU in arm_copy_from_user() Message-ID: <20210528143544.GQ30436@shell.armlinux.org.uk> References: <20210526100843.GD30436@shell.armlinux.org.uk> <20210526131853.GE30436@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210528_073549_500902_D28FE9EC X-CRM114-Status: GOOD ( 17.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gRnJpLCBNYXkgMjgsIDIwMjEgYXQgMTI6MDI6NTJQTSArMDIwMCwgS3J6eXN6dG9mIEhhxYJh c2Egd3JvdGU6Cj4gIlJ1c3NlbGwgS2luZyAoT3JhY2xlKSIgPGxpbnV4QGFybWxpbnV4Lm9yZy51 az4gd3JpdGVzOgo+IAo+ID4gSW4gYW55IGNhc2UsIGxvb2tpbmcgYXQgdGhlIGFyY2hpdGVjdHVy ZSByZWZlcmVuY2UgbWFudWFsLCBMRE0gaXMKPiA+IHBlcm1pdHRlZCBvbiBkZXZpY2UgYW5kIHN0 cm9uZ2x5IG9yZGVyZWQgbWFwcGluZ3MsIGFuZCB0aGUgbWVtb3J5Cj4gPiBzdWJzeXN0ZW0gaXMg cmVxdWlyZWQgdG8gZGVjb21wb3NlIGl0IGludG8gYSBzZXJpZXMgb2YgMzItYml0IGFjY2Vzc2Vz Lgo+ID4gU28sIGl0IHNvdW5kcyB0byBtZSBsaWtlIHRoZXJlIGNvdWxkIGJlIGEgaGFyZHdhcmUg YnVnIGluIHRoZSBidXNlcy9JUFUKPiA+IGNhdXNpbmcgdGhpcy4KPiAKPiBJdCBzZWVtcyBzby4K PiAKPiBJIG1vZGlmaWVkIHRoZSBrZXJuZWwgSVBVIG1vZHVsZSBhIGJpdCwgaW5pdGlhbGl6ZWQg YSBidW5jaCBvZiBJUFUKPiByZWdpc3RlcnMgdG8ga25vd24gdmFsdWVzICgxLi4weEQpLiBSZXN1 bHRzIChmcm9tIDEgdG8gMTMgSVBVCj4gcmVnaXN0ZXJzKSBvYnRhaW5lZCB3aXRoIGRpZmZlcmVu dCBpbnN0cnVjdGlvbnM6Cj4gCj4gcmVhZGwoMTMgY29uc2VjdXRpdmUgcmVnaXN0ZXJzKTogQ1NJ ID0gMSAyIDMgNCA1IDYgNyA4IDkgQSBCIEMgRAo+IDEgPSByZWdpc3RlciAjMCBhbmQgc28gb24g LSByZWFkbCgpIHJlc3VsdHMgYXJlIG9idmlvdXNseSBjb3JyZWN0Lgo+IAo+IExETTE6ICAxIChu b3QgY29ycnVwdGVkKQo+IExETTI6ICAxIDMKPiBMRE0zOiAgMSAzIDQKPiBMRE00OiAgMiAzIDQg NAo+IExETTU6ICAxIDMgNCA1IDYKPiBMRE02OiAgMSAzIDQgNSA2IDcKPiBMRE03OiAgMSAzIDQg NSA2IDcgOAo+IExETTg6ICAyIDMgNCA1IDYgNyA4IDgKPiBMRE05OiAgMSAzIDQgNSA2IDcgOCA5 IEEKPiBMRE0xMDogMSAzIDQgNSA2IDcgOCA5IEEgQgo+IExETTExOiAxIDMgNCA1IDYgNyA4IDkg QSBCIEMKPiBMRE0xMjogMSAzIDQgNSA2IDcgOCA5IEEgQiBDIEQKClRoYXQncyByYXRoZXIgc2Fk LCBhbmQgZG9lcyBsb29rIHZlcnkgbXVjaCBsaWtlIGEgaGFyZHdhcmUgYnVnLgoKVGhlIHF1ZXN0 aW9uIGlzIHdoYXQgdG8gZG8gYWJvdXQgaXQuLi4gdGhlcmUncyBMaW51cycgImRvIG5vdCBicmVh awp1c2Vyc3BhY2UiIGVkaWN0IGFuZCB0aGF0J3MgZXhhY3RseSB3aGF0IHRoaXMgY2hhbmdlIGhh cyBkb25lLiBTbyBJCnN1cHBvc2Ugd2UncmUgZ29pbmcgdG8gaGF2ZSB0byByZXZlcnQgdGhlIGNo YW5nZSBhbmQgcHV0IHVwIHdpdGgKZXZlcnl0aGluZyBiZWluZyBzbGlnaHRseSBzbG93ZXIgb24g YXJtMzIgdGhhbiBpdCBvdGhlcndpc2Ugd291bGQKaGF2ZSBiZWVuLiBUaGF0IHByb2JhYmx5IG1l YW5zIHdlJ2xsIGVuZCB1cCB3aXRoIGFsbW9zdCBldmVyeSBrZXJuZWwKdHJlZSBvdXQgdGhlcmUg Y2FycnlpbmcgYSByZXZlcnQgb2YgdGhlIHJldmVydCB0byB3b3JrIGFyb3VuZCB0aGUKZmFjdCB0 aGF0IHNlZW1pbmdseSBOWFAgYnJva2UgdGhlaXIgaGFyZHdhcmUgLSB3aGljaCBpdHNlbGYgaXMg bm90CmEgZ29vZCBpZGVhLiBJIGd1ZXNzIHdlJ3JlIGp1c3QgZ29pbmcgdG8gaGF2ZSB0byBwdXQg dXAgd2l0aCB0aGF0LgoKLS0gClJNSydzIFBhdGNoIHN5c3RlbTogaHR0cHM6Ly93d3cuYXJtbGlu dXgub3JnLnVrL2RldmVsb3Blci9wYXRjaGVzLwpGVFRQIGlzIGhlcmUhIDQwTWJwcyBkb3duIDEw TWJwcyB1cC4gRGVjZW50IGNvbm5lY3Rpdml0eSBhdCBsYXN0IQoKX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxp c3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZy YWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=