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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham 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 7FAC3C433E0 for ; Tue, 12 Jan 2021 16:21:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3A18822AED for ; Tue, 12 Jan 2021 16:21:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2406667AbhALQVW (ORCPT ); Tue, 12 Jan 2021 11:21:22 -0500 Received: from aserp2120.oracle.com ([141.146.126.78]:34486 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392714AbhALQOc (ORCPT ); Tue, 12 Jan 2021 11:14:32 -0500 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10CGA0NO142138; Tue, 12 Jan 2021 16:13:23 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=EN/bm/KnJOaXSCTtC/p5re4ou+Yoqw8Op7n6HCN7qy0=; b=E0h5sUG9qDiDWEzx8vosHdWBEomJOsUHvNpu+fjxAMkEnEIdBfrxrezZMXYvGZitVOgo cXSt14Yz03xtWjsV4rnKdLSJgys8wojaa5emE+B5BiWqUqVFmmzZ5YJsiFBtejlYihY0 akhFcpN72+NlAI/g1X7PjYQR+iFgvgWxn2Guy8doiQH3983Z9yb1cEVrm72r8j0p5+P0 YfXLzKM3h8FeMRbRczlEK7BD+mfIkR6uXAHBkx1SUywkrmjEnW3MnfpsvEBb/8Lcj790 SV8duvToxAe4G+9yOvyNbMs/+rmGOUePjxPbll0WIF75Hz46qo8/nLfK9y02vWgaO4p8 vA== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2120.oracle.com with ESMTP id 360kcyq5d2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 Jan 2021 16:13:23 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10CGAbr5100453; Tue, 12 Jan 2021 16:13:22 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 360keh7j52-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 Jan 2021 16:13:22 +0000 Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 10CGDLDp004300; Tue, 12 Jan 2021 16:13:21 GMT Received: from revolver.jebus.ca (/23.233.25.87) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 12 Jan 2021 08:13:21 -0800 From: "Liam R. Howlett" To: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Andrew Morton , Song Liu , Davidlohr Bueso , "Paul E . McKenney" , Matthew Wilcox , Jerome Glisse , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra Subject: [PATCH v2 16/70] mm: Move find_vma_intersection to mmap.c and change implementation to maple tree. Date: Tue, 12 Jan 2021 11:11:46 -0500 Message-Id: <20210112161240.2024684-17-Liam.Howlett@Oracle.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210112161240.2024684-1-Liam.Howlett@Oracle.com> References: <20210112161240.2024684-1-Liam.Howlett@Oracle.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9862 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 phishscore=0 spamscore=0 malwarescore=0 suspectscore=0 mlxlogscore=999 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101120092 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9862 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 impostorscore=0 bulkscore=0 adultscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 mlxlogscore=999 mlxscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101120092 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When searching for a vma within a range, it is easier to use the maple tree interface. This means the find_vma() call changes to a special case of the find_vma_intersection(). Exported for kvm module. Signed-off-by: Liam R. Howlett --- include/linux/mm.h | 10 ++-------- mm/mmap.c | 41 ++++++++++++++++++++++++++++------------- 2 files changed, 30 insertions(+), 21 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index baaad07c43c99..996353a057500 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2651,14 +2651,8 @@ extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned lon /* Look up the first VMA which intersects the interval start_addr..end_addr-1, NULL if none. Assume start_addr < end_addr. */ -static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) -{ - struct vm_area_struct * vma = find_vma(mm,start_addr); - - if (vma && end_addr <= vma->vm_start) - vma = NULL; - return vma; -} +extern struct vm_area_struct *find_vma_intersection(struct mm_struct *mm, + unsigned long start_addr, unsigned long end_addr); static inline unsigned long vm_start_gap(struct vm_area_struct *vma) { diff --git a/mm/mmap.c b/mm/mmap.c index cab665a6daa05..6be58594afb3d 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2067,32 +2067,47 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, EXPORT_SYMBOL(get_unmapped_area); -/** - * find_vma() - Find the VMA for a given address, or the next vma. - * @mm The mm_struct to check - * @addr: The address +/* + * find_vma_intersection - Find the first vma between [@start, @end) + * @mm: The mm_struct to use. + * @start: The start address + * @end: The end address * - * Returns: The VMA assoicated with addr, or the next vma. - * May return NULL in the case of no vma at addr or above. + * Returns: The VMA associated with the @start or the next VMA within the range. */ -struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) +struct vm_area_struct *find_vma_intersection(struct mm_struct *mm, + unsigned long start_addr, + unsigned long end_addr) { struct vm_area_struct *vma; - MA_STATE(mas, &mm->mm_mt, start_addr, start_addr); + unsigned long addr = start_addr; /* Check the cache first. */ - vma = vmacache_find(mm, addr); + vma = vmacache_find(mm, start_addr); if (likely(vma)) return vma; - rcu_read_lock(); - vma = mas_find(&mas, end_addr - 1); - rcu_read_unlock(); + vma = mt_find(&mm->mm_mt, &addr, end_addr - 1); if (vma) - vmacache_update(addr, vma); + vmacache_update(start_addr, vma); return vma; } +EXPORT_SYMBOL(find_vma_intersection); + +/** + * find_vma() - Find the VMA for a given address, or the next vma. + * @mm: The mm_struct to check + * @addr: The address + * + * Returns: The VMA associated with addr, or the next vma. + * May return NULL in the case of no vma at addr or above. + */ +struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) +{ + // Note find_vma_intersection will decrease 0 to underflow to ULONG_MAX + return find_vma_intersection(mm, addr, 0); +} EXPORT_SYMBOL(find_vma); /** -- 2.28.0