From patchwork Mon Aug 22 15:03:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liam R. Howlett" X-Patchwork-Id: 12950696 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5326CC32772 for ; Mon, 22 Aug 2022 15:03:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EDD046B0081; Mon, 22 Aug 2022 11:03:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E65A56B0082; Mon, 22 Aug 2022 11:03:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C91A98D0002; Mon, 22 Aug 2022 11:03:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id ACB106B0081 for ; Mon, 22 Aug 2022 11:03:26 -0400 (EDT) Received: from smtpin24.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 7C22A80A87 for ; Mon, 22 Aug 2022 15:03:26 +0000 (UTC) X-FDA: 79827547212.24.BB0B58F Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by imf10.hostedemail.com (Postfix) with ESMTP id 28A21C0003 for ; Mon, 22 Aug 2022 15:03:23 +0000 (UTC) Received: from pps.filterd (m0246627.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27MEkItD027901; Mon, 22 Aug 2022 15:03:23 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : references : in-reply-to : content-type : content-transfer-encoding : mime-version; s=corp-2022-7-12; bh=1kNb/4PZSO1OENQH4kGsfc+HhKZTvRmam3cOhRQymGI=; b=YWovA3Ugy3Rg67SfmvGXfHPRw1q1T2y42G+rSafDDFKh+CBzbLmW+wZOVA+SPNloBoJJ eHyIPG8U0+6tESE3f8aLBFDoMKIQ4mKkRPLkVMEOpVj5G8htID05aFO0oDiIA+fFgmml 2mFQ2QH50YuvbvU5GCvp6O/qp8EWZSuPB/Uo9kCX614KQQKPckm2kk7xR1KxLcFPqVdO +WmV+0LASVYvieOokUqunja24/hYSJJHkx9V1FdBItEmuldn6AS//1aQ2y/u09KZLv9v A4eA6oWNTlpF9E5SK9H/HoUlLp+LcpVCzhGaYqMUR3W+draSsCWfQ4nFwJfTObh9wQUa kg== Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.appoci.oracle.com [138.1.37.129]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3j4axv894e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 22 Aug 2022 15:03:22 +0000 Received: from pps.filterd (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (8.17.1.5/8.17.1.5) with ESMTP id 27ME4Ok9035558; Mon, 22 Aug 2022 15:03:21 GMT Received: from nam04-mw2-obe.outbound.protection.outlook.com (mail-mw2nam04lp2176.outbound.protection.outlook.com [104.47.73.176]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3j3mq1tv5j-6 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 22 Aug 2022 15:03:21 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=XIqt8F9vm7pEOrGd/nJXY5MYEdeA62sLpvo9hQ0oIVUzviElkl0XagaHh+siQ8JSppHeZEXvyplKYyzPQptT7WISBYfBZi36HDWeV8b2CjOk7AWuChOk8HDncvnc8zeu0NyHiJBL3suSnmOxDirmZCjK3fxkiPFUWFC1Hv/YQZBkjFI7Dr6VV5aUrLeM2brQRZ13SmBV6OAlHM0XOz5nMp7zZM+y6XAEAfnbRtH0wY6lQcHOAuXMvSa7yzxGhGnJXy8RGbEtD9drGkDAX81S9mPMdqHqPJdCIxafgFyqHaBk0VALr/djUDyvfmto0rumEVwnBWGyn4BkX7W9sEMQpA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=1kNb/4PZSO1OENQH4kGsfc+HhKZTvRmam3cOhRQymGI=; b=hCpWkgUdv9eR5ZdkNEMHOc+ZQkaBXkF+bI2S9Or0iSh/QD3wG/CS5/odptzqDm8IcRo74wbK4Q0mGbwxJqLJ598YfIlhFe+sxcKVkYeX4L2ygqw6IjgJE+IQpXhEwjviZ6aKkoAwGHDjgh4PTLjX4lcKqTCN5UC97+8tMH/1+Br3t65GWlmTVxtKTkBrWxodtTn9CTKNwUbVrEN6CPgXrgkI+ohg2pXIaX4UVRuUNKBD49Fz5nuoZpXs0PuDOSTAn5QOlzCSkR3V3c6KY+a4zosV70RbKTsTY9Q8/aIinb2NLFYkX1CX7lBF/EgHBF6dn8BJurEs2Xx2QjE3ZzD8Fg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=1kNb/4PZSO1OENQH4kGsfc+HhKZTvRmam3cOhRQymGI=; b=EDBElAH+c7gWWfzhtCy1VcW1tBStsMUjzg2br00pLyRqucS501j7nKWexknXmhqh/nCgthBPSlvbqZkeQ/+yppuz0QtMCmMQ1mtmVsWP7JzsJJAvYGoH+zz92Cnmjnqe7SApfMe1WSQKa/8wQj4pn+E4Vc/LrWxBez/qk0NzheU= Received: from SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) by BN8PR10MB3506.namprd10.prod.outlook.com (2603:10b6:408:ad::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5546.21; Mon, 22 Aug 2022 15:03:18 +0000 Received: from SN6PR10MB3022.namprd10.prod.outlook.com ([fe80::3d34:ebb5:d9df:98b3]) by SN6PR10MB3022.namprd10.prod.outlook.com ([fe80::3d34:ebb5:d9df:98b3%5]) with mapi id 15.20.5546.023; Mon, 22 Aug 2022 15:03:18 +0000 From: Liam Howlett To: "maple-tree@lists.infradead.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Andrew Morton CC: Liam Howlett Subject: [PATCH v13 13/70] mm/mmap: use maple tree for unmapped_area{_topdown} Thread-Topic: [PATCH v13 13/70] mm/mmap: use maple tree for unmapped_area{_topdown} Thread-Index: AQHYtjhKte5JvgDGdU6rKD2l3hgfpw== Date: Mon, 22 Aug 2022 15:03:08 +0000 Message-ID: <20220822150128.1562046-14-Liam.Howlett@oracle.com> References: <20220822150128.1562046-1-Liam.Howlett@oracle.com> In-Reply-To: <20220822150128.1562046-1-Liam.Howlett@oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.35.1 x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 3f669573-0a37-49f5-6194-08da844f727c x-ms-traffictypediagnostic: BN8PR10MB3506:EE_ x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN6PR10MB3022.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(376002)(346002)(39860400002)(396003)(366004)(136003)(38070700005)(83380400001)(38100700002)(66556008)(36756003)(66446008)(122000001)(66476007)(8676002)(4326008)(64756008)(66946007)(76116006)(71200400001)(91956017)(6666004)(8936002)(26005)(6512007)(5660300002)(44832011)(6506007)(478600001)(6486002)(316002)(110136005)(41300700001)(86362001)(1076003)(186003)(2906002)(2616005)(107886003);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?iso-8859-1?q?gLSYugcTvm+1G5ABYgvZhnX?= =?iso-8859-1?q?kb49d19rKPXlef8cL9MMS6wPtYhD0byhiuPoz3WCmDLFXkVhlkw1+lrzUWHB?= =?iso-8859-1?q?+oRQ/q6YAEfPyYDnH+n6omp0astFKbexWboBh5ICoAP83IYbMgJu7oJsn6jR?= =?iso-8859-1?q?EdcSKjrs0Ow2NKfrPgcZozcJi9QPlhsqatC5TzOu2BAH7PaafsvP7sYWYZqe?= =?iso-8859-1?q?D7Jh+m9pm3Y7UqeB00nVytqC4Fx/oKjZxTwvd+jKcR6ob1QM2Nky0gRhZloi?= =?iso-8859-1?q?sP4Ri8BbOu6kp2WTB6cvb+XirwyUOpiAWGQdglSeCYCPDcZfremvDtWPUESu?= =?iso-8859-1?q?C1T6g7y7ae8kuQcHQ41FqYBVGpdG987iX+lDrm5MJFqhSpreLyioahDbLMxc?= =?iso-8859-1?q?zcmqYl1up9iZS6SjVp9WUdNOLILJwqKbj3Iit2LAfAyYEJTyQqXNwiewdDf0?= =?iso-8859-1?q?BcUc7Pln/rj1UmYjVuUo7tOCG6ZFujDoxa8pk8w/wkiq3tmp0aCWjVQJs1wv?= =?iso-8859-1?q?bFtK/PK3zlob/QEMRf+aUQ77OAVQ/ZesTt5llyWjXdDwl8BAV0trRuSKuF9b?= =?iso-8859-1?q?Vc1Tt/4wCkpAl9F/rvYG3TTmQ8l6Nfqi5k5vXp4O5oHbBIVLrcEK44jVUbR6?= =?iso-8859-1?q?KvZ2laWHu7f2zEiiDnD0fmPxVi+VcHCRS9bocSN+s1lgbYwQyb9TiNS1cvIm?= =?iso-8859-1?q?hs+5Bhhpxq0pQh73Vf0zmMZtEZTpJJt7FyOmKoNkn6PGwvFmBP7mc25/Kcp/?= =?iso-8859-1?q?pXwfbb3PGQUg23/U3YEwYGqg54tTATYnUcXHp+z5JGpdNPXkAMH5j5l1PtyB?= =?iso-8859-1?q?nBMuJD5jJXjs2PLlit+4YEx98ycxYu+s8JmU3ZzShENNkmjc5rycvOsts2hI?= =?iso-8859-1?q?rxuBcXjJFpaJZw8Ga7QHjlgdGf/BLgyBxslhZGQ48OYXKQwZp6dHdIdoRT2g?= =?iso-8859-1?q?so5YMsl/9zXSMGsbnCKuC8V5nJhWw6DnvqKvX1/UBKvBwBcgNu/rR7Ik/Cv0?= =?iso-8859-1?q?qMT/9B6Io44KpdBD/ICZKhENnZIzWwa0FSUm0/TuDYCo8FkZy1eW9Q67feoE?= =?iso-8859-1?q?cS97Wi1ctKvbU0b0ttiG7MjV2NIm+di+d9itToWRnxEIRMs4SxqzBwAb8cFc?= =?iso-8859-1?q?LstL9qTBMd4OWayQu/S8nfXiX4Aq6uobU/XTx59ZB1/dW+TkBAj6ZfrL4Dy7?= =?iso-8859-1?q?CN28kLXfhW7Kl9lIwmxq/+Y0umAaHkFv0tinpSqI7QoNm533QksIk9GAylSW?= =?iso-8859-1?q?1O61Uqbg4NhiWARVj3AwMzfyghC/LOUF/jYg4c7k42glrruYkZSKAEXq4843?= =?iso-8859-1?q?xO5VkS2lxArZVqLT0GfjNxy5Ku8AlVetrB2wj977O21eKVbcPhRQpMPJApRH?= =?iso-8859-1?q?m9hdrxjbX75HT3JyylaM2lKseZV4SG5hfogFtMgfp9nuDdPc1ZsVzP6ICVfz?= =?iso-8859-1?q?1hRZ7hNpEfnRpRp1KqCRaELHs0c0jSgKjSa7IgOrFAPkmfM1OHX3TFjiVRdo?= =?iso-8859-1?q?+358PlVZdque/RRTYYzG05Y+25JpBh/W4g+MUdXqzxv7qBfo3nqYRWW7Y1sZ?= =?iso-8859-1?q?6i6YYfreEHXzuD2cDEFd5qGI+L1onCC2OJUvlLAMjZW70MM46gU2LtciCAvU?= =?iso-8859-1?q?FFOI4qEkv/Fl0mxMPH+c1a7z3RwlzjbGzgEP2Pw=3D=3D?= MIME-Version: 1.0 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR10MB3022.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3f669573-0a37-49f5-6194-08da844f727c X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Aug 2022 15:03:08.8608 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: IIufdW6Sr0F9jtS1jSttcfID0LwIIno0UkVL7FF604chmuTv+5IdzJuGdtluZEphW9Cj9TOpclQP+jBQt+Hs/Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR10MB3506 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-22_09,2022-08-22_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 spamscore=0 phishscore=0 suspectscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208220064 X-Proofpoint-ORIG-GUID: c_774RR5AUiVeKAdq6phVJS0WDoOnX6m X-Proofpoint-GUID: c_774RR5AUiVeKAdq6phVJS0WDoOnX6m ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1661180604; a=rsa-sha256; cv=pass; b=gPS2t+QJBlSKbojGWEKSBQ4WsSYjulrHtlxKTYq/PSO/3+LBpZpl8yRLJE3Efh92klk6AK VjmPq9ErGUdhOu5emBMMoi4R+moRDLOqtwEFlBWe6+V+vkewXZGVZJ66T6Q/9fDa9gfDRJ P9WGezquvuCfW0k8tAzK5x4x7EsdCgQ= ARC-Authentication-Results: i=2; imf10.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2022-7-12 header.b=YWovA3Ug; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=EDBElAH+; spf=pass (imf10.hostedemail.com: domain of liam.howlett@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=liam.howlett@oracle.com; arc=pass ("microsoft.com:s=arcselector9901:i=1"); dmarc=pass (policy=none) header.from=oracle.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1661180604; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=1kNb/4PZSO1OENQH4kGsfc+HhKZTvRmam3cOhRQymGI=; b=P66CxsnKve72hZ7uQAf10iz17MXgA+qiSjpojQ/uAJ9r6ul2VBLZzfVj+qmDv5M5DABZ42 /lv4+++0SjpynQ8gPNeuuONeVk2zm5gAI7eiEnKjYjlD4MqaHCw3UGpUSaldRUYpNpY+p4 fmtlQVlAn+b4Dot/STdO8Ntji7Dg9jA= Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2022-7-12 header.b=YWovA3Ug; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=EDBElAH+; spf=pass (imf10.hostedemail.com: domain of liam.howlett@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=liam.howlett@oracle.com; arc=pass ("microsoft.com:s=arcselector9901:i=1"); dmarc=pass (policy=none) header.from=oracle.com X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 28A21C0003 X-Stat-Signature: oyab93qb14ngce4ja9tgftgpacp7by5b X-Rspam-User: X-HE-Tag: 1661180603-962876 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: "Liam R. Howlett" The maple tree code was added to find the unmapped area in a previous commit and was checked against what the rbtree returned, but the actual result was never used. Start using the maple tree implementation and remove the rbtree code. Add kernel documentation comment for these functions. Signed-off-by: Liam R. Howlett --- mm/mmap.c | 255 ++++++++---------------------------------------------- 1 file changed, 34 insertions(+), 221 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 948264cd39cd..68ee2958c0be 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2013,250 +2013,63 @@ unsigned long mmap_region(struct file *file, unsigned long addr, return error; } +/** + * unmapped_area() - Find an area between the low_limit and the high_limit with + * the correct alignment and offset, all from @info. Note: current->mm is used + * for the search. + * + * @info: The unmapped area information including the range (low_limit - + * hight_limit), the alignment offset and mask. + * + * Return: A memory address or -ENOMEM. + */ static unsigned long unmapped_area(struct vm_unmapped_area_info *info) { - /* - * We implement the search by looking for an rbtree node that - * immediately follows a suitable gap. That is, - * - gap_start = vma->vm_prev->vm_end <= info->high_limit - length; - * - gap_end = vma->vm_start >= info->low_limit + length; - * - gap_end - gap_start >= length - */ + unsigned long length, gap; - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; - unsigned long length, low_limit, high_limit, gap_start, gap_end; - unsigned long gap; - MA_STATE(mas, &mm->mm_mt, 0, 0); + MA_STATE(mas, ¤t->mm->mm_mt, 0, 0); /* Adjust search length to account for worst case alignment overhead */ length = info->length + info->align_mask; if (length < info->length) return -ENOMEM; - mas_empty_area(&mas, info->low_limit, info->high_limit - 1, - length); - gap = mas.index; - gap += (info->align_offset - gap) & info->align_mask; - - /* Adjust search limits by the desired length */ - if (info->high_limit < length) + if (mas_empty_area(&mas, info->low_limit, info->high_limit - 1, + length)) return -ENOMEM; - high_limit = info->high_limit - length; - if (info->low_limit > high_limit) - return -ENOMEM; - low_limit = info->low_limit + length; - - /* Check if rbtree root looks promising */ - if (RB_EMPTY_ROOT(&mm->mm_rb)) - goto check_highest; - vma = rb_entry(mm->mm_rb.rb_node, struct vm_area_struct, vm_rb); - if (vma->rb_subtree_gap < length) - goto check_highest; - - while (true) { - /* Visit left subtree if it looks promising */ - gap_end = vm_start_gap(vma); - if (gap_end >= low_limit && vma->vm_rb.rb_left) { - struct vm_area_struct *left = - rb_entry(vma->vm_rb.rb_left, - struct vm_area_struct, vm_rb); - if (left->rb_subtree_gap >= length) { - vma = left; - continue; - } - } - - gap_start = vma->vm_prev ? vm_end_gap(vma->vm_prev) : 0; -check_current: - /* Check if current node has a suitable gap */ - if (gap_start > high_limit) - return -ENOMEM; - if (gap_end >= low_limit && - gap_end > gap_start && gap_end - gap_start >= length) - goto found; - - /* Visit right subtree if it looks promising */ - if (vma->vm_rb.rb_right) { - struct vm_area_struct *right = - rb_entry(vma->vm_rb.rb_right, - struct vm_area_struct, vm_rb); - if (right->rb_subtree_gap >= length) { - vma = right; - continue; - } - } - - /* Go back up the rbtree to find next candidate node */ - while (true) { - struct rb_node *prev = &vma->vm_rb; - if (!rb_parent(prev)) - goto check_highest; - vma = rb_entry(rb_parent(prev), - struct vm_area_struct, vm_rb); - if (prev == vma->vm_rb.rb_left) { - gap_start = vm_end_gap(vma->vm_prev); - gap_end = vm_start_gap(vma); - goto check_current; - } - } - } - -check_highest: - /* Check highest gap, which does not precede any rbtree node */ - gap_start = mm->highest_vm_end; - gap_end = ULONG_MAX; /* Only for VM_BUG_ON below */ - if (gap_start > high_limit) - return -ENOMEM; - -found: - /* We found a suitable gap. Clip it with the original low_limit. */ - if (gap_start < info->low_limit) - gap_start = info->low_limit; - - /* Adjust gap address to the desired alignment */ - gap_start += (info->align_offset - gap_start) & info->align_mask; - - VM_BUG_ON(gap_start + info->length > info->high_limit); - VM_BUG_ON(gap_start + info->length > gap_end); - - VM_BUG_ON(gap != gap_start); - return gap_start; + gap = mas.index; + gap += (info->align_offset - gap) & info->align_mask; + return gap; } +/** + * unmapped_area_topdown() - Find an area between the low_limit and the + * high_limit with * the correct alignment and offset at the highest available + * address, all from @info. Note: current->mm is used for the search. + * + * @info: The unmapped area information including the range (low_limit - + * hight_limit), the alignment offset and mask. + * + * Return: A memory address or -ENOMEM. + */ static unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info) { - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma = NULL; - unsigned long length, low_limit, high_limit, gap_start, gap_end; - unsigned long gap; - - MA_STATE(mas, &mm->mm_mt, 0, 0); - validate_mm_mt(mm); + unsigned long length, gap; + MA_STATE(mas, ¤t->mm->mm_mt, 0, 0); /* Adjust search length to account for worst case alignment overhead */ length = info->length + info->align_mask; if (length < info->length) return -ENOMEM; - mas_empty_area_rev(&mas, info->low_limit, info->high_limit - 1, - length); - gap = mas.last + 1 - info->length; - gap -= (gap - info->align_offset) & info->align_mask; - - /* - * Adjust search limits by the desired length. - * See implementation comment at top of unmapped_area(). - */ - gap_end = info->high_limit; - if (gap_end < length) - return -ENOMEM; - high_limit = gap_end - length; - - if (info->low_limit > high_limit) + if (mas_empty_area_rev(&mas, info->low_limit, info->high_limit - 1, + length)) return -ENOMEM; - low_limit = info->low_limit + length; - /* Check highest gap, which does not precede any rbtree node */ - gap_start = mm->highest_vm_end; - if (gap_start <= high_limit) - goto found_highest; - - /* Check if rbtree root looks promising */ - if (RB_EMPTY_ROOT(&mm->mm_rb)) - return -ENOMEM; - vma = rb_entry(mm->mm_rb.rb_node, struct vm_area_struct, vm_rb); - if (vma->rb_subtree_gap < length) - return -ENOMEM; - - while (true) { - /* Visit right subtree if it looks promising */ - gap_start = vma->vm_prev ? vm_end_gap(vma->vm_prev) : 0; - if (gap_start <= high_limit && vma->vm_rb.rb_right) { - struct vm_area_struct *right = - rb_entry(vma->vm_rb.rb_right, - struct vm_area_struct, vm_rb); - if (right->rb_subtree_gap >= length) { - vma = right; - continue; - } - } - -check_current: - /* Check if current node has a suitable gap */ - gap_end = vm_start_gap(vma); - if (gap_end < low_limit) - return -ENOMEM; - if (gap_start <= high_limit && - gap_end > gap_start && gap_end - gap_start >= length) - goto found; - - /* Visit left subtree if it looks promising */ - if (vma->vm_rb.rb_left) { - struct vm_area_struct *left = - rb_entry(vma->vm_rb.rb_left, - struct vm_area_struct, vm_rb); - if (left->rb_subtree_gap >= length) { - vma = left; - continue; - } - } - - /* Go back up the rbtree to find next candidate node */ - while (true) { - struct rb_node *prev = &vma->vm_rb; - if (!rb_parent(prev)) - return -ENOMEM; - vma = rb_entry(rb_parent(prev), - struct vm_area_struct, vm_rb); - if (prev == vma->vm_rb.rb_right) { - gap_start = vma->vm_prev ? - vm_end_gap(vma->vm_prev) : 0; - goto check_current; - } - } - } - -found: - /* We found a suitable gap. Clip it with the original high_limit. */ - if (gap_end > info->high_limit) - gap_end = info->high_limit; - -found_highest: - /* Compute highest gap address at the desired alignment */ - gap_end -= info->length; - gap_end -= (gap_end - info->align_offset) & info->align_mask; - - VM_BUG_ON(gap_end < info->low_limit); - VM_BUG_ON(gap_end < gap_start); - - if (gap != gap_end) { - pr_err("%s: %p Gap was found: mt %lu gap_end %lu\n", __func__, - mm, gap, gap_end); - pr_err("window was %lu - %lu size %lu\n", info->high_limit, - info->low_limit, length); - pr_err("mas.min %lu max %lu mas.last %lu\n", mas.min, mas.max, - mas.last); - pr_err("mas.index %lu align mask %lu offset %lu\n", mas.index, - info->align_mask, info->align_offset); - pr_err("rb_find_vma find on %lu => %p (%p)\n", mas.index, - find_vma(mm, mas.index), vma); -#if defined(CONFIG_DEBUG_VM_MAPLE_TREE) - mt_dump(&mm->mm_mt); -#endif - { - struct vm_area_struct *dv = mm->mmap; - - while (dv) { - pr_err("vma %p %lu-%lu\n", dv, dv->vm_start, dv->vm_end); - dv = dv->vm_next; - } - } - VM_BUG_ON(gap != gap_end); - } - - return gap_end; + gap = mas.last + 1 - info->length; + gap -= (gap - info->align_offset) & info->align_mask; + return gap; } /*