From nobody Tue Apr 7 10:38:07 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 C5E7EECAAD4 for ; Mon, 29 Aug 2022 21:26:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229829AbiH2V0b (ORCPT ); Mon, 29 Aug 2022 17:26:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229449AbiH2V0N (ORCPT ); Mon, 29 Aug 2022 17:26:13 -0400 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BCE5874B96 for ; Mon, 29 Aug 2022 14:25:51 -0700 (PDT) Received: by mail-pf1-x449.google.com with SMTP id 125-20020a621483000000b0053814ac4b8bso1875870pfu.16 for ; Mon, 29 Aug 2022 14:25:51 -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=ooNZAin4dExMhxnzVFEqRWXW+87JR2sLE0fevcXKZcM=; b=I4AROHhc91xv1qcH3nCi9ZpRLfIZ0YYOknUuCx0UCVegrJDEOhp2xXx6sXe9aCLn1C FzO21jqONtvqpljlp8Pb4Y+CdSx9zRBCbsYcOU1CMA6tT/zAnvmRorbY0bmK2T02uMkI Atv+IFZLAVnvs+tVzbF09RqlClFEsd0HUKtTSkQ+YRbpf3d4jB4ZfuXvxVp5TLyaLLyx AxdLnxV0cUJcHwzUd+Lxky4P92oXj4Xhl4or9fJrlsG5GoIvzarsCtdrQ2b29IJKR80y NIBWQdZUPTZNVXZAtYrsTzYsNpAhtyZg3hqM9pNuOBs9nY5UdbnMfXBZJ7yLdA5TAp1d MxBA== 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=ooNZAin4dExMhxnzVFEqRWXW+87JR2sLE0fevcXKZcM=; b=nRixvNdDUbgvxI/59c0ksaZZh8aXERwYbz4uRgcusa62rZxma/LuKlReAZGUE1XjvJ GGdvVFvt+eMmmDqDyEoVJSzpq4Bni8A9DcwwTZCS2Vm31hb4jH2YaiTQJECwFR2DW00U h3VY5i0yP2znJQJ+95nqM8MuQw25KBzGj2Rmfn6wV9rJfShWHV7OKYNEjX7Vw9NUI9yH kaIk8CHU04RBBFBhUHd8NmPbhd2ewrj9g0eCISL1ugNn6UZFsx0Dsa/AxzQ8iKKoVT2h J7nS9oDRte4Cf5W//WAZuGNrFUMhutPsTYuMjwFWKKAWGvdGRb/T5ihDVoeN7jeshJb1 XAzg== X-Gm-Message-State: ACgBeo3TzOsfZIwUjsbnSt9vnMOJecOyYdr1cZAT9VrP7IvDNKlQzAsJ iZjoocg6wsDydyc92BRPsRnnbHE30lM= X-Google-Smtp-Source: AA6agR6Ch+8H2P4ZiI/nyVX9BprKXIg4wSUP+mENwsodRVHrGORNiLr4bLOGgyZYxzbEnnQphTeE0ezRPcY= X-Received: from surenb-spec.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3e30]) (user=surenb job=sendgmr) by 2002:a17:90a:4607:b0:1fa:f794:2c0d with SMTP id w7-20020a17090a460700b001faf7942c0dmr20939608pjg.24.1661808349897; Mon, 29 Aug 2022 14:25:49 -0700 (PDT) Date: Mon, 29 Aug 2022 21:25:11 +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: <20220829212531.3184856-9-surenb@google.com> Subject: [RFC PATCH 08/28] mm/khugepaged: mark VMA as locked while collapsing a hugepage 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" Protect VMA from concurrent page fault handler while modifying it in collapse_huge_page. Signed-off-by: Suren Baghdasaryan --- mm/khugepaged.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 01f71786d530..030680633989 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1072,6 +1072,7 @@ static void collapse_huge_page(struct mm_struct *mm, if (mm_find_pmd(mm, address) !=3D pmd) goto out_up_write; =20 + vma_mark_locked(vma); anon_vma_lock_write(vma->anon_vma); =20 mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm, --=20 2.37.2.672.g94769d06f0-goog