From nobody Tue Apr 7 10:38:50 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2172ECAAD2 for ; Mon, 29 Aug 2022 21:26:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229949AbiH2V0s (ORCPT ); Mon, 29 Aug 2022 17:26:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32840 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229873AbiH2V0U (ORCPT ); Mon, 29 Aug 2022 17:26:20 -0400 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 19B5E8C470 for ; Mon, 29 Aug 2022 14:25:59 -0700 (PDT) Received: by mail-pl1-x649.google.com with SMTP id m5-20020a170902f64500b0016d313f3ce7so6864671plg.23 for ; Mon, 29 Aug 2022 14:25:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc; bh=TWnM2nl+IWV2Xsj5xnZFMNMq0JvYeydCw4P9njL7O34=; b=QxyTYU3FERVCw2VziTt0AktgHLl//+1LB6ej8pZ2s1TWfQT3cvsAWfnuU7caTHeT9p cUZ3ty459UM3cwcXwNVqpzu7fZxDdvEiQ7oppDRkd/R2+Ilj86/8iy+0q3ZJXoZ4hnye zLhHEgIO/fbjIHEiSfoXxsUyX6O+Z8dic5XVruk2KEpor5fjgGmf4uNln1+WOsbYbTO8 1++i5QRJ3Dh2yxyVyOmY5Dm8Y1A3ze3Xt4uhd4NBeKcnHbK+ENDvs3AO4SaOBTp9Wi+f EGkkrDdrwisqruuTTVNnHMbKcZefZFlW3jnAC7mX9edrYOzqBxLpV3pgyWig/2c0mbAr sZlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc; bh=TWnM2nl+IWV2Xsj5xnZFMNMq0JvYeydCw4P9njL7O34=; b=qfOf+APAbzS0pxkYmRjhl2XSWCmGK0n7PHkNW5n/V1FRvkRcHvSxVe/pp0s3XfjCbO UAV+XV36Kpfnxi9ZLwqpJ9XGWBRzqtfyRbFRvswHmS4tyZCuaEvvNHpB/GaqxSDbhEE+ P7FSt+qQA0YgqICg+Rx1lvvpFux6EgrYbuGmOK7Besc6WAUVBSZ+juFBgAmGWw5qCUv1 YQKUWcLvnLfZHAqbHKEkqxUIdLtq1Jg7uyuWDMYPngVQDYqs68euL3ZHPtQnUddeAxqM oFS73/zAcCJe+ZL1mVKUjBx+Vifkgr496qnItJItD1TaCYQDfgS9EGSqRyUYLMreuK11 O1dQ== X-Gm-Message-State: ACgBeo2Ka2o95WGiO3F/6X/U9ZaCTmq9ya/ZlszOUctY+CzEojWxP7xp NUgnfN+CftnjswHku7/52TcBEMmRp3A= X-Google-Smtp-Source: AA6agR76cA5Bw6pPdfILXZxKwAftwtVJj++YaWYUCk6VRMlDSa2HJ+OTsxxi3Jretb4HksKEr9YwTk9TbU4= X-Received: from surenb-spec.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3e30]) (user=surenb job=sendgmr) by 2002:a17:903:18b:b0:16e:f09c:919b with SMTP id z11-20020a170903018b00b0016ef09c919bmr18604991plg.135.1661808358173; Mon, 29 Aug 2022 14:25:58 -0700 (PDT) Date: Mon, 29 Aug 2022 21:25:15 +0000 In-Reply-To: <20220829212531.3184856-1-surenb@google.com> Mime-Version: 1.0 References: <20220829212531.3184856-1-surenb@google.com> X-Mailer: git-send-email 2.37.2.672.g94769d06f0-goog Message-ID: <20220829212531.3184856-13-surenb@google.com> Subject: [RFC PATCH 12/28] mm/mremap: mark VMA as locked while remapping it to a new address range From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, laurent.dufour@fr.ibm.com, paulmck@kernel.org, riel@surriel.com, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, surenb@google.com, kernel-team@android.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Mark VMA as locked before copying it and when copy_vma produces a new VMA. Signed-off-by: Suren Baghdasaryan --- mm/mmap.c | 1 + mm/mremap.c | 1 + 2 files changed, 2 insertions(+) diff --git a/mm/mmap.c b/mm/mmap.c index ade3909c89b4..121544fd90de 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -3248,6 +3248,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct= **vmap, get_file(new_vma->vm_file); if (new_vma->vm_ops && new_vma->vm_ops->open) new_vma->vm_ops->open(new_vma); + vma_mark_locked(new_vma); vma_link(mm, new_vma, prev, rb_link, rb_parent); *need_rmap_locks =3D false; } diff --git a/mm/mremap.c b/mm/mremap.c index b522cd0259a0..bdbf96254e43 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -620,6 +620,7 @@ static unsigned long move_vma(struct vm_area_struct *vm= a, return -ENOMEM; } =20 + vma_mark_locked(vma); new_pgoff =3D vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT); new_vma =3D copy_vma(&vma, new_addr, new_len, new_pgoff, &need_rmap_locks); --=20 2.37.2.672.g94769d06f0-goog