From nobody Mon Apr 6 23:06:40 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 E164AC64991 for ; Thu, 1 Sep 2022 17:36:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233908AbiIARgv (ORCPT ); Thu, 1 Sep 2022 13:36:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234677AbiIARfp (ORCPT ); Thu, 1 Sep 2022 13:35:45 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5FFCD5A82A for ; Thu, 1 Sep 2022 10:35:43 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id h9-20020a256c09000000b0069671af62ecso4907321ybc.4 for ; Thu, 01 Sep 2022 10:35:43 -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=sXPRs4un8Hv1KgYmIkiOTpDZHlwje1UN18vDRt/znXA=; b=LBJTSzoCXGb4iiWKyO0OEdlY4M2wMr4mJ5fdr9ss+SWylmfoHLBZ3bDcjUEYCuu5eS feBNbsez+RUGQT+LSEIL3jhNfGQ3mzrdU70gDdYtaUSlqG4c3zRWe4jgoZRdVjvHQEvZ SPCTeif98/8TgsTaO2lykBXQO/Ydnr0/XtxYChsH6bMYMfoCTEgHM9QVPOJS0Mu1k2UR t6jxn7uXNz4Ix/YY107csqUZ1FzpL1YUPLT0wcSHa5tJ7jOlfkB6DfkgR6ONkj0xZI4Q CdDjSBazMRaOu6i4p9xpWVSdGu4/KGHF+Yxu3Dy4GMEd28lc2vp55tWuelmW724hNsiA vxOg== 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=sXPRs4un8Hv1KgYmIkiOTpDZHlwje1UN18vDRt/znXA=; b=mgRCSTCRiT2tihJCfTtEl9jXBxTnTLftq1dD5hcQM5LBXpXf35Ef6P2cUxt41idXBM oSyHiX4HAWIJ7t9AQMZpGcv0O8czgzG7cGImJufUxYXFGSLjjelxMDPqiiRrJtu9Uodd xE7R8cPaHGT1w0/x2K1ijdVuLIj6bTAmu6eH9GMR2sxD4+tGVDb0qoXjIh1IynCCjjP7 8+XWgaXldCcVSq66dGkY75IUNPwSlODZ//zBoM/Q8vD0OSxcKwuLPFxZZyxPfuOZC10F ns3QcebLYXL4jyuv7o6s/tiVNqrthklb8jxD57rfmVlSto42MsAyWOsu3eTpBIRmUmUh 5m5w== X-Gm-Message-State: ACgBeo1huL1JoFiL3yuYGnNwoWGbbWSi4hoq4Sd79GZaQHbs/qULK1mw uOionelHSOYfmO9btHUx9xPcdwzhpyM= X-Google-Smtp-Source: AA6agR4Ppy4TlAx5Lt/45OnUgJ5yxX2999apq2x6zNaCId6+AMBNoDmW6LxkNrA1Ax704mp9y4OtGqUy/dg= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:1bfc:e7ee:6530:4449]) (user=surenb job=sendgmr) by 2002:a05:6902:120f:b0:676:aaa4:8434 with SMTP id s15-20020a056902120f00b00676aaa48434mr20939193ybu.218.1662053742565; Thu, 01 Sep 2022 10:35:42 -0700 (PDT) Date: Thu, 1 Sep 2022 10:34:56 -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: <20220901173516.702122-9-surenb@google.com> Subject: [RFC PATCH RESEND 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@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 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 2.37.2.789.g6183377224-goog