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=-16.2 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,UNWANTED_LANGUAGE_BODY,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 E2FBDC43332 for ; Tue, 12 Jan 2021 16:19:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C227A22AED for ; Tue, 12 Jan 2021 16:19:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393169AbhALQPa (ORCPT ); Tue, 12 Jan 2021 11:15:30 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:43170 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393117AbhALQP2 (ORCPT ); Tue, 12 Jan 2021 11:15:28 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10CG980Q181173; Tue, 12 Jan 2021 16:14:08 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=Xs/da3uQj6GGEGUoVgcFg1HKfu/wmIl1PdZct4FEqNQ=; b=xvtEfRqMj5xYOeo5qDzCz0dF3KUMTqAj5MPfG5T8Cafff2Qp4XfKuvyWDpIOMwP6Dm6q bsT4j038i4Lc0pEPZ8G3KjSe4kty2hl1FqVqoRoBVGKu0yYCi/Bo6NZ6QzyxxnWbDHPD JZLq/X0OeFBopko2iMYvlPsKvjZOxEH10JyVtGv6RNcLOHhfNnWUGbgvMqyk7mP1wyh8 1Q+h3M4rI0fcX8eamanmBUuDehnlGDhF638bpw6aZ41W1mXFD1GgauMeQNFYYAIOFpPI kjldSn0Um91FU0uVIxWLajgIFRxjHgYc5ELc40GpA948o8C1n+ScQaj6SUmGnXjtXIUp ow== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 360kvjy1q7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 Jan 2021 16:14:08 +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 10CGAbZc100476; Tue, 12 Jan 2021 16:14:08 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3030.oracle.com with ESMTP id 360keh7k91-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 Jan 2021 16:14:08 +0000 Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 10CGE6vE030454; Tue, 12 Jan 2021 16:14:06 GMT Received: from revolver.jebus.ca (/23.233.25.87) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 12 Jan 2021 08:14:04 -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 45/70] fs/userfaultfd: Stop using vma linked list. Date: Tue, 12 Jan 2021 11:12:15 -0500 Message-Id: <20210112161240.2024684-46-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 mlxlogscore=999 phishscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 impostorscore=0 spamscore=0 mlxscore=0 suspectscore=0 adultscore=0 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 Don't use the mm_struct linked list or the vma->vm_next in prep for removal Signed-off-by: Liam R. Howlett --- fs/userfaultfd.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 000b457ad0876..b0eac6fb3e8e2 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -598,14 +598,16 @@ static void userfaultfd_event_wait_completion(struct userfaultfd_ctx *ctx, if (release_new_ctx) { struct vm_area_struct *vma; struct mm_struct *mm = release_new_ctx->mm; + MA_STATE(mas, &mm->mm_mt, 0, 0); /* the various vma->vm_userfaultfd_ctx still points to it */ mmap_write_lock(mm); - for (vma = mm->mmap; vma; vma = vma->vm_next) + mas_for_each(&mas, vma, ULONG_MAX) { if (vma->vm_userfaultfd_ctx.ctx == release_new_ctx) { vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX; vma->vm_flags &= ~(VM_UFFD_WP | VM_UFFD_MISSING); } + } mmap_write_unlock(mm); userfaultfd_ctx_put(release_new_ctx); @@ -790,7 +792,9 @@ int userfaultfd_unmap_prep(struct vm_area_struct *vma, unsigned long start, unsigned long end, struct list_head *unmaps) { - for ( ; vma && vma->vm_start < end; vma = vma->vm_next) { + MA_STATE(mas, &vma->vm_mm->mm_mt, vma->vm_start, vma->vm_start); + + mas_for_each(&mas, vma, end) { struct userfaultfd_unmap_ctx *unmap_ctx; struct userfaultfd_ctx *ctx = vma->vm_userfaultfd_ctx.ctx; @@ -840,6 +844,7 @@ static int userfaultfd_release(struct inode *inode, struct file *file) /* len == 0 means wake all */ struct userfaultfd_wake_range range = { .len = 0, }; unsigned long new_flags; + MA_STATE(mas, &mm->mm_mt, 0, 0); WRITE_ONCE(ctx->released, true); @@ -856,7 +861,7 @@ static int userfaultfd_release(struct inode *inode, struct file *file) */ mmap_write_lock(mm); prev = NULL; - for (vma = mm->mmap; vma; vma = vma->vm_next) { + mas_for_each(&mas, vma, ULONG_MAX) { cond_resched(); BUG_ON(!!vma->vm_userfaultfd_ctx.ctx ^ !!(vma->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP))); @@ -1270,6 +1275,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, bool found; bool basic_ioctls; unsigned long start, end, vma_end; + MA_STATE(mas, &mm->mm_mt, 0, 0); user_uffdio_register = (struct uffdio_register __user *) arg; @@ -1328,7 +1334,8 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, */ found = false; basic_ioctls = false; - for (cur = vma; cur && cur->vm_start < end; cur = cur->vm_next) { + mas_set(&mas, vma->vm_start); + mas_for_each(&mas, cur, end) { cond_resched(); BUG_ON(!!cur->vm_userfaultfd_ctx.ctx ^ @@ -1444,7 +1451,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, skip: prev = vma; start = vma->vm_end; - vma = vma->vm_next; + vma = vma_next(mm, vma); } while (vma && vma->vm_start < end); out_unlock: mmap_write_unlock(mm); @@ -1485,6 +1492,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, bool found; unsigned long start, end, vma_end; const void __user *buf = (void __user *)arg; + MA_STATE(mas, &mm->mm_mt, 0, 0); ret = -EFAULT; if (copy_from_user(&uffdio_unregister, buf, sizeof(uffdio_unregister))) @@ -1528,7 +1536,9 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, */ found = false; ret = -EINVAL; - for (cur = vma; cur && cur->vm_start < end; cur = cur->vm_next) { + mas_set(&mas, vma->vm_start); + + mas_for_each(&mas, cur, end) { cond_resched(); BUG_ON(!!cur->vm_userfaultfd_ctx.ctx ^ @@ -1614,7 +1624,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, skip: prev = vma; start = vma->vm_end; - vma = vma->vm_next; + vma = vma_next(mm, vma); } while (vma && vma->vm_start < end); out_unlock: mmap_write_unlock(mm); -- 2.28.0