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Tue, 05 Nov 2019 15:13:31 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xA5FB6tt027055; Tue, 5 Nov 2019 15:13:31 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3030.oracle.com with ESMTP id 2w35pp2pd1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 05 Nov 2019 15:13:30 +0000 Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id xA5FDSHx018497; Tue, 5 Nov 2019 15:13:29 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 05 Nov 2019 07:13:28 -0800 Subject: Re: [PATCH v2 09/15] xen/gntdev: use mmu_range_notifier_insert To: Jason Gunthorpe Cc: "linux-mm@kvack.org" , Jerome Glisse , Ralph Campbell , John Hubbard , "Felix.Kuehling@amd.com" , "linux-rdma@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , "amd-gfx@lists.freedesktop.org" , Alex Deucher , Ben Skeggs , =?UTF-8?Q?Christian_K=c3=b6nig?= , David Zhou , Dennis Dalessandro , Juergen Gross , Mike Marciniszyn , Oleksandr Andrushchenko , Petr Cvek , Stefano Stabellini , "nouveau@lists.freedesktop.org" , "xen-devel@lists.xenproject.org" , Christoph Hellwig References: <20191028201032.6352-1-jgg@ziepe.ca> <20191028201032.6352-10-jgg@ziepe.ca> <3938b588-c6c5-3bd1-8ea9-47e4d5b2045c@oracle.com> <20191105023108.GN22766@mellanox.com> From: Boris Ostrovsky Autocrypt: addr=boris.ostrovsky@oracle.com; prefer-encrypt=mutual; keydata= mQINBFH8CgsBEAC0KiOi9siOvlXatK2xX99e/J3OvApoYWjieVQ9232Eb7GzCWrItCzP8FUV PQg8rMsSd0OzIvvjbEAvaWLlbs8wa3MtVLysHY/DfqRK9Zvr/RgrsYC6ukOB7igy2PGqZd+M MDnSmVzik0sPvB6xPV7QyFsykEgpnHbvdZAUy/vyys8xgT0PVYR5hyvhyf6VIfGuvqIsvJw5 C8+P71CHI+U/IhsKrLrsiYHpAhQkw+Zvyeml6XSi5w4LXDbF+3oholKYCkPwxmGdK8MUIdkM d7iYdKqiP4W6FKQou/lC3jvOceGupEoDV9botSWEIIlKdtm6C4GfL45RD8V4B9iy24JHPlom woVWc0xBZboQguhauQqrBFooHO3roEeM1pxXjLUbDtH4t3SAI3gt4dpSyT3EvzhyNQVVIxj2 FXnIChrYxR6S0ijSqUKO0cAduenhBrpYbz9qFcB/GyxD+ZWY7OgQKHUZMWapx5bHGQ8bUZz2 SfjZwK+GETGhfkvNMf6zXbZkDq4kKB/ywaKvVPodS1Poa44+B9sxbUp1jMfFtlOJ3AYB0WDS Op3d7F2ry20CIf1Ifh0nIxkQPkTX7aX5rI92oZeu5u038dHUu/dO2EcuCjl1eDMGm5PLHDSP 0QUw5xzk1Y8MG1JQ56PtqReO33inBXG63yTIikJmUXFTw6lLJwARAQABtDNCb3JpcyBPc3Ry b3Zza3kgKFdvcmspIDxib3Jpcy5vc3Ryb3Zza3lAb3JhY2xlLmNvbT6JAjgEEwECACIFAlH8 CgsCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEIredpCGysGyasEP/j5xApopUf4g 9Fl3UxZuBx+oduuw3JHqgbGZ2siA3EA4bKwtKq8eT7ekpApn4c0HA8TWTDtgZtLSV5IdH+9z JimBDrhLkDI3Zsx2CafL4pMJvpUavhc5mEU8myp4dWCuIylHiWG65agvUeFZYK4P33fGqoaS VGx3tsQIAr7MsQxilMfRiTEoYH0WWthhE0YVQzV6kx4wj4yLGYPPBtFqnrapKKC8yFTpgjaK jImqWhU9CSUAXdNEs/oKVR1XlkDpMCFDl88vKAuJwugnixjbPFTVPyoC7+4Bm/FnL3iwlJVE qIGQRspt09r+datFzPqSbp5Fo/9m4JSvgtPp2X2+gIGgLPWp2ft1NXHHVWP19sPgEsEJXSr9 tskM8ScxEkqAUuDs6+x/ISX8wa5Pvmo65drN+JWA8EqKOHQG6LUsUdJolFM2i4Z0k40BnFU/ kjTARjrXW94LwokVy4x+ZYgImrnKWeKac6fMfMwH2aKpCQLlVxdO4qvJkv92SzZz4538az1T m+3ekJAimou89cXwXHCFb5WqJcyjDfdQF857vTn1z4qu7udYCuuV/4xDEhslUq1+GcNDjAhB nNYPzD+SvhWEsrjuXv+fDONdJtmLUpKs4Jtak3smGGhZsqpcNv8nQzUGDQZjuCSmDqW8vn2o hWwveNeRTkxh+2x1Qb3GT46uuQINBFH8CgsBEADGC/yx5ctcLQlB9hbq7KNqCDyZNoYu1HAB Hal3MuxPfoGKObEktawQPQaSTB5vNlDxKihezLnlT/PKjcXC2R1OjSDinlu5XNGc6mnky03q yymUPyiMtWhBBftezTRxWRslPaFWlg/h/Y1iDuOcklhpr7K1h1jRPCrf1yIoxbIpDbffnuyz kuto4AahRvBU4Js4sU7f/btU+h+e0AcLVzIhTVPIz7PM+Gk2LNzZ3/on4dnEc/qd+ZZFlOQ4 KDN/hPqlwA/YJsKzAPX51L6Vv344pqTm6Z0f9M7YALB/11FO2nBB7zw7HAUYqJeHutCwxm7i BDNt0g9fhviNcJzagqJ1R7aPjtjBoYvKkbwNu5sWDpQ4idnsnck4YT6ctzN4I+6lfkU8zMzC gM2R4qqUXmxFIS4Bee+gnJi0Pc3KcBYBZsDK44FtM//5Cp9DrxRQOh19kNHBlxkmEb8kL/pw XIDcEq8MXzPBbxwHKJ3QRWRe5jPNpf8HCjnZz0XyJV0/4M1JvOua7IZftOttQ6KnM4m6WNIZ 2ydg7dBhDa6iv1oKdL7wdp/rCulVWn8R7+3cRK95SnWiJ0qKDlMbIN8oGMhHdin8cSRYdmHK kTnvSGJNlkis5a+048o0C6jI3LozQYD/W9wq7MvgChgVQw1iEOB4u/3FXDEGulRVko6xCBU4 SQARAQABiQIfBBgBAgAJBQJR/AoLAhsMAAoJEIredpCGysGyfvMQAIywR6jTqix6/fL0Ip8G jpt3uk//QNxGJE3ZkUNLX6N786vnEJvc1beCu6EwqD1ezG9fJKMl7F3SEgpYaiKEcHfoKGdh 30B3Hsq44vOoxR6zxw2B/giADjhmWTP5tWQ9548N4VhIZMYQMQCkdqaueSL+8asp8tBNP+TJ PAIIANYvJaD8xA7sYUXGTzOXDh2THWSvmEWWmzok8er/u6ZKdS1YmZkUy8cfzrll/9hiGCTj u3qcaOM6i/m4hqtvsI1cOORMVwjJF4+IkC5ZBoeRs/xW5zIBdSUoC8L+OCyj5JETWTt40+lu qoqAF/AEGsNZTrwHJYu9rbHH260C0KYCNqmxDdcROUqIzJdzDKOrDmebkEVnxVeLJBIhYZUd t3Iq9hdjpU50TA6sQ3mZxzBdfRgg+vaj2DsJqI5Xla9QGKD+xNT6v14cZuIMZzO7w0DoojM4 ByrabFsOQxGvE0w9Dch2BDSI2Xyk1zjPKxG1VNBQVx3flH37QDWpL2zlJikW29Ws86PHdthh Fm5PY8YtX576DchSP6qJC57/eAAe/9ztZdVAdesQwGb9hZHJc75B+VNm4xrh/PJO6c1THqdQ 19WVJ+7rDx3PhVncGlbAOiiiE3NOFPJ1OQYxPKtpBUukAlOTnkKE6QcA4zckFepUkfmBV1wM Jg6OxFYd01z+a+oL Message-ID: Date: Tue, 5 Nov 2019 10:16:46 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20191105023108.GN22766@mellanox.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9432 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911050126 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9432 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911050126 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On 11/4/19 9:31 PM, Jason Gunthorpe wrote: > On Mon, Nov 04, 2019 at 05:03:31PM -0500, Boris Ostrovsky wrote: >> On 10/28/19 4:10 PM, Jason Gunthorpe wrote: >>> @@ -445,17 +438,9 @@ static void gntdev_vma_close(struct vm_area_struct *vma) >>> struct gntdev_priv *priv = file->private_data; >>> >>> pr_debug("gntdev_vma_close %p\n", vma); >>> - if (use_ptemod) { >>> - /* It is possible that an mmu notifier could be running >>> - * concurrently, so take priv->lock to ensure that the vma won't >>> - * vanishing during the unmap_grant_pages call, since we will >>> - * spin here until that completes. Such a concurrent call will >>> - * not do any unmapping, since that has been done prior to >>> - * closing the vma, but it may still iterate the unmap_ops list. >>> - */ >>> - mutex_lock(&priv->lock); >>> + if (use_ptemod && map->vma == vma) { >> >> Is it possible for map->vma not to be equal to vma? > It could be NULL at least if use_ptemod is not set. > > Otherwise, I'm not sure, the confusing bit is that the map comes from > here: > > map = gntdev_find_map_index(priv, index, count); > > It looks like the intent is that the map->vma is always set to the > only vma that has the map as private_data. I am not sure how this can work otherwise. We stash map pointer in vm's vm_private_data and vice versa (for use_ptemod) gntdev_mmap() so if they have to match. That's why I was asking you to see if you had something particular in mind when you added this test. > So, I suppose it can be relaxed to a null test and a WARN_ON that it > hasn't changed? You mean if (use_ptemod) {         WARN_ON(map->vma != vma);         ... Yes, that sounds good. -boris From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Ostrovsky Subject: Re: [PATCH v2 09/15] xen/gntdev: use mmu_range_notifier_insert Date: Tue, 5 Nov 2019 10:16:46 -0500 Message-ID: References: <20191028201032.6352-1-jgg@ziepe.ca> <20191028201032.6352-10-jgg@ziepe.ca> <3938b588-c6c5-3bd1-8ea9-47e4d5b2045c@oracle.com> <20191105023108.GN22766@mellanox.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20191105023108.GN22766@mellanox.com> Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Jason Gunthorpe Cc: Juergen Gross , David Zhou , Ralph Campbell , Stefano Stabellini , Oleksandr Andrushchenko , "linux-rdma@vger.kernel.org" , John Hubbard , "Felix.Kuehling@amd.com" , Mike Marciniszyn , "dri-devel@lists.freedesktop.org" , Christoph Hellwig , "linux-mm@kvack.org" , Jerome Glisse , "amd-gfx@lists.freedesktop.org" , "nouveau@lists.freedesktop.org" , Alex Deucher , "xen-devel@lists.xenproject.org" , Dennis Dalessandro List-Id: nouveau.vger.kernel.org T24gMTEvNC8xOSA5OjMxIFBNLCBKYXNvbiBHdW50aG9ycGUgd3JvdGU6Cj4gT24gTW9uLCBOb3Yg MDQsIDIwMTkgYXQgMDU6MDM6MzFQTSAtMDUwMCwgQm9yaXMgT3N0cm92c2t5IHdyb3RlOgo+PiBP biAxMC8yOC8xOSA0OjEwIFBNLCBKYXNvbiBHdW50aG9ycGUgd3JvdGU6Cj4+PiBAQCAtNDQ1LDE3 ICs0MzgsOSBAQCBzdGF0aWMgdm9pZCBnbnRkZXZfdm1hX2Nsb3NlKHN0cnVjdCB2bV9hcmVhX3N0 cnVjdCAqdm1hKQo+Pj4gIAlzdHJ1Y3QgZ250ZGV2X3ByaXYgKnByaXYgPSBmaWxlLT5wcml2YXRl X2RhdGE7Cj4+PiAgCj4+PiAgCXByX2RlYnVnKCJnbnRkZXZfdm1hX2Nsb3NlICVwXG4iLCB2bWEp Owo+Pj4gLQlpZiAodXNlX3B0ZW1vZCkgewo+Pj4gLQkJLyogSXQgaXMgcG9zc2libGUgdGhhdCBh biBtbXUgbm90aWZpZXIgY291bGQgYmUgcnVubmluZwo+Pj4gLQkJICogY29uY3VycmVudGx5LCBz byB0YWtlIHByaXYtPmxvY2sgdG8gZW5zdXJlIHRoYXQgdGhlIHZtYSB3b24ndAo+Pj4gLQkJICog dmFuaXNoaW5nIGR1cmluZyB0aGUgdW5tYXBfZ3JhbnRfcGFnZXMgY2FsbCwgc2luY2Ugd2Ugd2ls bAo+Pj4gLQkJICogc3BpbiBoZXJlIHVudGlsIHRoYXQgY29tcGxldGVzLiBTdWNoIGEgY29uY3Vy cmVudCBjYWxsIHdpbGwKPj4+IC0JCSAqIG5vdCBkbyBhbnkgdW5tYXBwaW5nLCBzaW5jZSB0aGF0 IGhhcyBiZWVuIGRvbmUgcHJpb3IgdG8KPj4+IC0JCSAqIGNsb3NpbmcgdGhlIHZtYSwgYnV0IGl0 IG1heSBzdGlsbCBpdGVyYXRlIHRoZSB1bm1hcF9vcHMgbGlzdC4KPj4+IC0JCSAqLwo+Pj4gLQkJ bXV0ZXhfbG9jaygmcHJpdi0+bG9jayk7Cj4+PiArCWlmICh1c2VfcHRlbW9kICYmIG1hcC0+dm1h ID09IHZtYSkgewo+Pgo+PiBJcyBpdCBwb3NzaWJsZSBmb3IgbWFwLT52bWEgbm90IHRvIGJlIGVx dWFsIHRvIHZtYT8KPiBJdCBjb3VsZCBiZSBOVUxMIGF0IGxlYXN0IGlmIHVzZV9wdGVtb2QgaXMg bm90IHNldC4KPgo+IE90aGVyd2lzZSwgSSdtIG5vdCBzdXJlLCB0aGUgY29uZnVzaW5nIGJpdCBp cyB0aGF0IHRoZSBtYXAgY29tZXMgZnJvbQo+IGhlcmU6Cj4KPiAgICAgICAgIG1hcCA9IGdudGRl dl9maW5kX21hcF9pbmRleChwcml2LCBpbmRleCwgY291bnQpOwo+Cj4gSXQgbG9va3MgbGlrZSB0 aGUgaW50ZW50IGlzIHRoYXQgdGhlIG1hcC0+dm1hIGlzIGFsd2F5cyBzZXQgdG8gdGhlCj4gb25s eSB2bWEgdGhhdCBoYXMgdGhlIG1hcCBhcyBwcml2YXRlX2RhdGEuCgpJIGFtIG5vdCBzdXJlIGhv dyB0aGlzIGNhbiB3b3JrIG90aGVyd2lzZS4gV2Ugc3Rhc2ggbWFwIHBvaW50ZXIgaW4gdm0ncwp2 bV9wcml2YXRlX2RhdGEgYW5kIHZpY2UgdmVyc2EgKGZvciB1c2VfcHRlbW9kKSBnbnRkZXZfbW1h cCgpIHNvIGlmIHRoZXkKaGF2ZSB0byBtYXRjaC4KClRoYXQncyB3aHkgSSB3YXMgYXNraW5nIHlv dSB0byBzZWUgaWYgeW91IGhhZCBzb21ldGhpbmcgcGFydGljdWxhciBpbgptaW5kIHdoZW4geW91 IGFkZGVkIHRoaXMgdGVzdC4KCj4gU28sIEkgc3VwcG9zZSBpdCBjYW4gYmUgcmVsYXhlZCB0byBh IG51bGwgdGVzdCBhbmQgYSBXQVJOX09OIHRoYXQgaXQKPiBoYXNuJ3QgY2hhbmdlZD8KCllvdSBt ZWFuCgppZiAodXNlX3B0ZW1vZCkgewrCoMKgwqDCoMKgwqDCoCBXQVJOX09OKG1hcC0+dm1hICE9 IHZtYSk7CsKgwqDCoMKgwqDCoMKgIC4uLgoKClllcywgdGhhdCBzb3VuZHMgZ29vZC4KCgotYm9y aXMKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1k ZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxpc3RzLnhlbnByb2plY3Qub3JnCmh0dHBzOi8v bGlzdHMueGVucHJvamVjdC5vcmcvbWFpbG1hbi9saXN0aW5mby94ZW4tZGV2ZWw= From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A765C5DF61 for ; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20191105023108.GN22766@mellanox.com> Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9432 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911050126 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9432 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911050126 Subject: Re: [Xen-devel] [PATCH v2 09/15] xen/gntdev: use mmu_range_notifier_insert X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , David Zhou , Ralph Campbell , Stefano Stabellini , Oleksandr Andrushchenko , "linux-rdma@vger.kernel.org" , John Hubbard , "Felix.Kuehling@amd.com" , Mike Marciniszyn , "dri-devel@lists.freedesktop.org" , Christoph Hellwig , "linux-mm@kvack.org" , Jerome Glisse , "amd-gfx@lists.freedesktop.org" , "nouveau@lists.freedesktop.org" , Alex Deucher , "xen-devel@lists.xenproject.org" , Dennis Dalessandro , Petr Cvek , =?UTF-8?Q?Christian_K=c3=b6nig?= , Ben Skeggs Content-Type: text/plain; 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charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" Message-ID: <20191105151646.6S2u8yzKYUZU0Inw6Bv5JNrA5UI4mFYQYkpx5HvXANQ@z> T24gMTEvNC8xOSA5OjMxIFBNLCBKYXNvbiBHdW50aG9ycGUgd3JvdGU6Cj4gT24gTW9uLCBOb3Yg MDQsIDIwMTkgYXQgMDU6MDM6MzFQTSAtMDUwMCwgQm9yaXMgT3N0cm92c2t5IHdyb3RlOgo+PiBP biAxMC8yOC8xOSA0OjEwIFBNLCBKYXNvbiBHdW50aG9ycGUgd3JvdGU6Cj4+PiBAQCAtNDQ1LDE3 ICs0MzgsOSBAQCBzdGF0aWMgdm9pZCBnbnRkZXZfdm1hX2Nsb3NlKHN0cnVjdCB2bV9hcmVhX3N0 cnVjdCAqdm1hKQo+Pj4gIAlzdHJ1Y3QgZ250ZGV2X3ByaXYgKnByaXYgPSBmaWxlLT5wcml2YXRl X2RhdGE7Cj4+PiAgCj4+PiAgCXByX2RlYnVnKCJnbnRkZXZfdm1hX2Nsb3NlICVwXG4iLCB2bWEp Owo+Pj4gLQlpZiAodXNlX3B0ZW1vZCkgewo+Pj4gLQkJLyogSXQgaXMgcG9zc2libGUgdGhhdCBh biBtbXUgbm90aWZpZXIgY291bGQgYmUgcnVubmluZwo+Pj4gLQkJICogY29uY3VycmVudGx5LCBz byB0YWtlIHByaXYtPmxvY2sgdG8gZW5zdXJlIHRoYXQgdGhlIHZtYSB3b24ndAo+Pj4gLQkJICog dmFuaXNoaW5nIGR1cmluZyB0aGUgdW5tYXBfZ3JhbnRfcGFnZXMgY2FsbCwgc2luY2Ugd2Ugd2ls bAo+Pj4gLQkJICogc3BpbiBoZXJlIHVudGlsIHRoYXQgY29tcGxldGVzLiBTdWNoIGEgY29uY3Vy cmVudCBjYWxsIHdpbGwKPj4+IC0JCSAqIG5vdCBkbyBhbnkgdW5tYXBwaW5nLCBzaW5jZSB0aGF0 IGhhcyBiZWVuIGRvbmUgcHJpb3IgdG8KPj4+IC0JCSAqIGNsb3NpbmcgdGhlIHZtYSwgYnV0IGl0 IG1heSBzdGlsbCBpdGVyYXRlIHRoZSB1bm1hcF9vcHMgbGlzdC4KPj4+IC0JCSAqLwo+Pj4gLQkJ bXV0ZXhfbG9jaygmcHJpdi0+bG9jayk7Cj4+PiArCWlmICh1c2VfcHRlbW9kICYmIG1hcC0+dm1h ID09IHZtYSkgewo+Pgo+PiBJcyBpdCBwb3NzaWJsZSBmb3IgbWFwLT52bWEgbm90IHRvIGJlIGVx dWFsIHRvIHZtYT8KPiBJdCBjb3VsZCBiZSBOVUxMIGF0IGxlYXN0IGlmIHVzZV9wdGVtb2QgaXMg bm90IHNldC4KPgo+IE90aGVyd2lzZSwgSSdtIG5vdCBzdXJlLCB0aGUgY29uZnVzaW5nIGJpdCBp cyB0aGF0IHRoZSBtYXAgY29tZXMgZnJvbQo+IGhlcmU6Cj4KPiAgICAgICAgIG1hcCA9IGdudGRl dl9maW5kX21hcF9pbmRleChwcml2LCBpbmRleCwgY291bnQpOwo+Cj4gSXQgbG9va3MgbGlrZSB0 aGUgaW50ZW50IGlzIHRoYXQgdGhlIG1hcC0+dm1hIGlzIGFsd2F5cyBzZXQgdG8gdGhlCj4gb25s eSB2bWEgdGhhdCBoYXMgdGhlIG1hcCBhcyBwcml2YXRlX2RhdGEuCgpJIGFtIG5vdCBzdXJlIGhv dyB0aGlzIGNhbiB3b3JrIG90aGVyd2lzZS4gV2Ugc3Rhc2ggbWFwIHBvaW50ZXIgaW4gdm0ncwp2 bV9wcml2YXRlX2RhdGEgYW5kIHZpY2UgdmVyc2EgKGZvciB1c2VfcHRlbW9kKSBnbnRkZXZfbW1h cCgpIHNvIGlmIHRoZXkKaGF2ZSB0byBtYXRjaC4KClRoYXQncyB3aHkgSSB3YXMgYXNraW5nIHlv dSB0byBzZWUgaWYgeW91IGhhZCBzb21ldGhpbmcgcGFydGljdWxhciBpbgptaW5kIHdoZW4geW91 IGFkZGVkIHRoaXMgdGVzdC4KCj4gU28sIEkgc3VwcG9zZSBpdCBjYW4gYmUgcmVsYXhlZCB0byBh IG51bGwgdGVzdCBhbmQgYSBXQVJOX09OIHRoYXQgaXQKPiBoYXNuJ3QgY2hhbmdlZD8KCllvdSBt ZWFuCgppZiAodXNlX3B0ZW1vZCkgewrCoMKgwqDCoMKgwqDCoCBXQVJOX09OKG1hcC0+dm1hICE9 IHZtYSk7CsKgwqDCoMKgwqDCoMKgIC4uLgoKClllcywgdGhhdCBzb3VuZHMgZ29vZC4KCgotYm9y aXMKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KYW1kLWdm eCBtYWlsaW5nIGxpc3QKYW1kLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0 cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9hbWQtZ2Z4