Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) client-ip=23.128.96.37;
From:   Donald Robson <Donald.Robson@imgtec.com>
To:     "daniel@ffwll.ch" <daniel@ffwll.ch>,
        Frank Binns <Frank.Binns@imgtec.com>,
        Matt Coster <Matt.Coster@imgtec.com>,
        "mripard@kernel.org" <mripard@kernel.org>,
        "airlied@gmail.com" <airlied@gmail.com>,
        "dakr@redhat.com" <dakr@redhat.com>,
        Sarah Walker <Sarah.Walker@imgtec.com>
CC:     "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH drm-misc-next 3/5] drm/imagination: vm: fix drm_gpuvm
 reference count
Thread-Topic: [PATCH drm-misc-next 3/5] drm/imagination: vm: fix drm_gpuvm
 reference count
Thread-Index: AQHaIea02sTQUVrj3k+ysru0BXe5Mg==
Date:   Tue, 28 Nov 2023 10:36:10 +0000
Message-ID: <90f220de5aeb91e5e2dc64ec662ee961414c067f.camel@imgtec.com>
References: <20231124233650.152653-1-dakr@redhat.com>
         <20231124233650.152653-4-dakr@redhat.com>
In-Reply-To: <20231124233650.152653-4-dakr@redhat.com>
Accept-Language: en-GB, en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?utf-8?B?Y2hybkl0U3RWRmxPd1FqMWd2cHNiODF1ZkJDRHVRRFZmRXdINForRU01MGFE?=
 =?utf-8?B?TmJWcStzRjREQ280STlYanNBQ2NBM29nWEpnM2J1cGNYNTB2ZEFoTmsrQ0k2?=
 =?utf-8?B?TER5WTVKK2ZBMjFsejlqWHZLbWRNbHNGVmt1SEtVZms4Vk1rZlpsTS85MTJL?=
 =?utf-8?B?KzlkTzhiU1k3Vi9STkM0ZlppaHRBQzA3SHc5MWczQ1c0Z1VhZHRnTmVnamNM?=
 =?utf-8?B?NExtamlxb1NhMnBmWnhBenc3ZHRKYzk3Z0JtSUlERXlndStIN3ppMXU0VHJk?=
 =?utf-8?B?ODlNTGoyQnI3cnZWUDhFdndaUTJ4bUxLR20vSTFpbC9WZUEwYVNteUpTZURx?=
 =?utf-8?B?cElNNWNHc3h5cDI2RnRScS9sR2FlRFdxc3RISlVPT09oc0VaNlJPc3NIYVRm?=
 =?utf-8?B?S3hIRm1PRElkaDhCeEpjeVBDeUQ5M2d0OGw2d1g4QzZYeFhZMVF4YlYwVzYr?=
 =?utf-8?B?UmhkeUxXK1B1UG1QS3VTQ1ZMeUV0Ylh1QktZdUJVT0hnWGwwVVl4Qi91NnZK?=
 =?utf-8?B?clI4eTM1ZHlkZEREbElGSlNqR0ExQU94ZUk3UmwrejV4YnhVRjdVYzdna2lV?=
 =?utf-8?B?NTczUmRTTGxYc3RVd0l3Tm1tZjh5OTdCQVBQL3lQWS8wSHFRZ0V6R1VOQUhB?=
 =?utf-8?B?KzFINzh4b0JudVBHMFJZRE9GUUNiTzAwY1JGS3pLRm9YVmJIQ3AvMXhjN0Na?=
 =?utf-8?B?OUduNnVxSEtuSjF5SzBnSnBjdlFkUi92anY0RTVJWnpJWXAvcTlEOFdvNk1L?=
 =?utf-8?B?eVJ5QXRIOTNveU8wY3M0ZE05RkR3c2E4bVJSaHAxc2Z0a0NaclU4cnUwWHhk?=
 =?utf-8?B?SW5EWll5ZjJPczdFdy9HeHNXVmJudXZRU3ZhYUdMN09BcUF1T3p6MHZZOUtK?=
 =?utf-8?B?aURZUHFkR2xHRFNIUDlHaWZtK2pyZTl3YjVZOHVvTmpTSDFReFdVemtaQlBT?=
 =?utf-8?B?ajcvZ2srSThaRmlHaWYxZi9NeVM5VU9idmRLeVdaTHpTOUN6ank2SklSdVZp?=
 =?utf-8?B?dy9mRHpIbVJEVUlyakN6QlBDV215cU9RaVk4UGE2VnptZjlpSkUxc0ZzWHBp?=
 =?utf-8?B?RjR6c2h4aW0zR1dzNE9QVHZuMTV6bjU0QmRxaWRucHcrWFZGUVJZQS9KRHpv?=
 =?utf-8?B?RmR3N3JUenZUQ3RsbU1RUnlaVXUrTVdQbVZ1MGdpc28ydUJ2ZzlDVlludTRQ?=
 =?utf-8?B?Q3R0TExQS2NMeWhrRzl1WXZ1dVJidElWK1RpQms1WDFJaU9VZURqRGVGTWlM?=
 =?utf-8?B?WFdYaFVkY2N0aWJKMk5mdTY2M1U3d3EySVJpWVhUMGdMRnRlVHdzSWs5Yit0?=
 =?utf-8?B?Z1hScDlNVU1lSnZaSU1yYlBpS2lLMHpPUzlNaStmSE1Jdml0WW16Tk9BYU1r?=
 =?utf-8?B?SjFDOFdwQzRTUlNFczVleFdjYlRVcHljU3d3dzAxRERvMldqWENmSHlpVGxo?=
 =?utf-8?B?MHU2WjlFbGY0cU1zMmdCdXRrU1NCRmNlN0hXb2MwdXExVlM3UlVYRmNzQi9J?=
 =?utf-8?B?UGc0S0hFSU1HUGovak9SdXRCanJhMHkwNGdMTE02aVoxQWk2Y1NZRWJ5a3RS?=
 =?utf-8?B?dGZCQ2U2WjYvYU9MTjlWVWlYMjRQNS9OcHN1aldTS3crdGlqcjJ5RFU5aVNO?=
 =?utf-8?B?QzZKYVAxcU9VaWwxdUdwMmEvSUFOTnh4ZjNGMzdKQXY0NGhwSFhSdWFxK0x3?=
 =?utf-8?B?YnE3STNhMjRyVkFQU1JMUUdVQkxJczg3SGpEb3M4ZHA1VUxDaUp3SlJLdTN1?=
 =?utf-8?B?TFMva01IKzRJL21wbjZxdzR2NnRHbjRxWFBMWGxYNWorUTI3aG1LSDJhcDU5?=
 =?utf-8?B?ZFdjeTN4V1RIT1NvZ0RoVDBMZ25mSTRjWTREdUpneWJXNmpzV2tKdDhzOVJR?=
 =?utf-8?B?T0tSeGZUTjhyZ2tBMVJvOTMwRTJnUVNyNld6UWZKZCt6SGZiVnd2a3BNNUZ2?=
 =?utf-8?B?QjR2QnI3UDVXbjJtUHp0TmhlV1A4TmszZ3RvRmlHSkJsOHdNUE1tTGIrR2pE?=
 =?utf-8?B?dVpVQnJkL0FES2RmSFZLOGF6dkVBTFQ3RWRsbDJia0hibklYLzkxbkd6K3NS?=
 =?utf-8?B?ZGN2U0V1TGNLMStERW80dlFRV3E0U0JQaFFMQVhnYllZSzNiOTFsTWVySytj?=
 =?utf-8?B?SUJCWHBNV3N6QWdiS1JNbHV4ckVZU0h0U3hQWWJRM3Y0QXU2TTAxSmhLdWZI?=
 =?utf-8?B?d2c9PQ==?=
Content-Type: text/plain; charset="utf-8"
Content-ID: <F951CAC87782B34E9689C57F410C0C88@GBRP265.PROD.OUTLOOK.COM>
Content-Transfer-Encoding: base64
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: CWLP265MB5770.GBRP265.PROD.OUTLOOK.COM
X-MS-Exchange-CrossTenant-Network-Message-Id: 394a529c-12e2-4030-cb4a-08dbeffdd681
X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Nov 2023 10:36:10.7403
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 0d5fd8bb-e8c2-4e0a-8dd5-2c264f7140fe
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: DAZpfZtI0fW8pEulZoj/vq9h21XhYT52VwOB+RTfPYEgZmExzZXT2ZmptnWhuULt+zrN5WsEC63yTNxVbB+q6YAwPp1UvWh3XGon2bPEsJU=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CWLP265MB6596
X-OriginatorOrg: imgtec.com
X-EXCLAIMER-MD-CONFIG: 15a78312-3e47-46eb-9010-2e54d84a9631
X-Proofpoint-ORIG-GUID: DTF1ofafVHm9BfzgjXIsZpd7H0erUDKj
X-Proofpoint-GUID: DTF1ofafVHm9BfzgjXIsZpd7H0erUDKj
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED,
        SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham
        autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Tue, 28 Nov 2023 02:38:37 -0800 (PST)
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