From patchwork Thu Sep 1 17:34:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suren Baghdasaryan X-Patchwork-Id: 12963000 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 27395ECAAD1 for ; Thu, 1 Sep 2022 17:37:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:From:Subject:Message-ID: References:Mime-Version:In-Reply-To:Date:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=cP3bOnWvDiO45pgC4cwY1LVywkgDo5ZwwmUkez/cVLo=; b=KORt2scME10u8dB8nxKONuPKzB IRSTiEqQRb69fqsklvuLZj+w+huU73BZb4DE3c6KZQS96KUNX9QvpvZb3WYJ8XxTJKwqvFohFe+l1 ix2r4Buiyb8FAY8h9rEYqIt5u+l6PdWZnsPz6U6aAlKLj1SZ+2AgZRU4nbhMwLXNsqWhhymwdmAMg 8V107LQytWRZK+ExP3DT4KB7zX/qSycG19HyG+s15vSlDtqGLIYz6JLwufp7zozkkojHLakjHQTaO obe4Mwcwq8st5Y8XLKg4HDrO4f/QTs1+/eBrn0gISZTc8+6nlogpcN26eF49wxcTqCbzLftUGxgWT WnypP9qw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oTo7N-00DcCo-Q5; Thu, 01 Sep 2022 17:36:42 +0000 Received: from mail-yb1-xb4a.google.com ([2607:f8b0:4864:20::b4a]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oTo6X-00DbWE-JE for linux-arm-kernel@lists.infradead.org; Thu, 01 Sep 2022 17:35:50 +0000 Received: by mail-yb1-xb4a.google.com with SMTP id i6-20020a259786000000b0069648392979so4915132ybo.11 for ; Thu, 01 Sep 2022 10:35:48 -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:subject:date; bh=DiVLSVAVO410fRJcvWWuX+r6LjGy2i2DyacaHp6fzuc=; b=kNx38Jhqjx9XlmKxOVsRKukj17KeQAoUkvOgezSjJcI7qDa8s6siy6+ZCSn18LnVHi n4QLcTPTYnWQedOp2NOA065emr+I7/FhDV/20btA2UJprNGZCfJvY2fzU6JS3rffkIEf 2FurYAnF0+QmVLyL1XlOy/6eS9/B08Rzb+EHT4ihXLuAM0YGViLuLR9Pls5xzIb0RA++ peqVg5K5+yJOyniQSXXLxLw8N9e7jk4WJ8bD01w4ADM9IUXJZsw/A2NPWpCJiNE61osh 1/9xE4X1j0QNkz0GiHjK4YBUmosqgJkbBEuUlP/cGGRjR6eOLhrxcNhT+yoJZX8wCM9W ZvhQ== 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:subject:date; bh=DiVLSVAVO410fRJcvWWuX+r6LjGy2i2DyacaHp6fzuc=; b=I3jx2c3mwQ8yJS8RhnU54sM7Bo9btaXBEhokVM/gTO1bUDaRkoLMDX8nMGhjYAWV9c slobOF/JiB//mIxhqbWfyCu9SM/L1ZrBo/pLkOMc8W9IUnhn4zenRpGmWlpZOhcJR1sC 22zIq2Hy8vtvZyL+YQgQlPDBzpmuSUIqmFvPadxDtn6BL7VDqeyx3WHxYn9XjQtg/lcu /VDlqEoxVX65x1fW5HtkSnJYTEBUrBlhDu1TbYpizzl2uuvRh3/RxENXRyAvzTZtoeao z6qBXZVChPZn1haHhcl/sHzuHYEtcUq8WefL3+b4/M9xTW7FdDjH/QS3YZ7ZatV9G/Xc bkYg== X-Gm-Message-State: ACgBeo1pp/9kAaQDVTNn/0uuWSZlzvGdPXJf9Amco5rHfHC6SpN6AJ2Y gP3JdER1Y4bY41aYrdv3sEUA1q5RuVA= X-Google-Smtp-Source: AA6agR4qMG/7UuuiqhHhvohWNal3nFjDJKXC1X/Q7rlLCDCvl4ZyXaMMKRMmizmDLQF7LDsGfEt+/G6N4D4= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:1bfc:e7ee:6530:4449]) (user=surenb job=sendgmr) by 2002:a25:bf92:0:b0:695:8d8f:2af4 with SMTP id l18-20020a25bf92000000b006958d8f2af4mr20427159ybk.200.1662053748060; Thu, 01 Sep 2022 10:35:48 -0700 (PDT) Date: Thu, 1 Sep 2022 10:34:58 -0700 In-Reply-To: <20220901173516.702122-1-surenb@google.com> Mime-Version: 1.0 References: <20220901173516.702122-1-surenb@google.com> X-Mailer: git-send-email 2.37.2.789.g6183377224-goog Message-ID: <20220901173516.702122-11-surenb@google.com> Subject: [RFC PATCH RESEND 10/28] mm/mmap: mark VMAs as locked in vma_adjust 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@suse.de, 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, 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220901_103549_655463_3EF0C493 X-CRM114-Status: GOOD ( 15.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org vma_adjust modifies a VMA and possibly its neighbors. Mark them as locked before making the modifications. Signed-off-by: Suren Baghdasaryan --- mm/mmap.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/mm/mmap.c b/mm/mmap.c index f89c9b058105..ed58cf0689b2 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -710,6 +710,10 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, long adjust_next = 0; int remove_next = 0; + vma_mark_locked(vma); + if (next) + vma_mark_locked(next); + if (next && !insert) { struct vm_area_struct *exporter = NULL, *importer = NULL; @@ -754,8 +758,11 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, * If next doesn't have anon_vma, import from vma after * next, if the vma overlaps with it. */ - if (remove_next == 2 && !next->anon_vma) + if (remove_next == 2 && !next->anon_vma) { exporter = next->vm_next; + if (exporter) + vma_mark_locked(exporter); + } } else if (end > next->vm_start) { /* @@ -931,6 +938,8 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, * "vma->vm_next" gap must be updated. */ next = vma->vm_next; + if (next) + vma_mark_locked(next); } else { /* * For the scope of the comment "next" and