From nobody Thu Sep 18 14:13:45 2025 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 16FC4C4332F for ; Mon, 5 Dec 2022 17:30:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231175AbiLERaf (ORCPT ); Mon, 5 Dec 2022 12:30:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232240AbiLERaY (ORCPT ); Mon, 5 Dec 2022 12:30:24 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1762321E25 for ; Mon, 5 Dec 2022 09:30:24 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A4A936125C for ; Mon, 5 Dec 2022 17:30:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4164FC433C1; Mon, 5 Dec 2022 17:30:22 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="b4iFPk8e" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1670261419; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=4ElxRnkIjBHzAgajGGzltaINjdTXoXoQxedqqUtDsyc=; b=b4iFPk8etq9IanUvVfBSGkntQ1u628JEicMhdNYhLAXe4xoQX9QqOt+w8W+UPp9nMeggkY ik0sKiYjM+5vAAldQUgD65ea0IFl1koO5WOWbrMxOpw00C4D6zPFrfD1iD/Z/zoBDXazxy xc8VLIMrtPAZxy2wAEPQHsPSXs65nbI= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id b44d0242 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Mon, 5 Dec 2022 17:30:19 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: "Jason A. Donenfeld" , Eric B Munson , "Kirill A . Shutemov" , Vlastimil Babka , Andrew Morton Subject: [PATCH] mm: do not show ?? for VM_LOCKONFAULT pages Date: Mon, 5 Dec 2022 18:30:07 +0100 Message-Id: <20221205173007.580210-1-Jason@zx2c4.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When VM_LOCKONFAULT was added, /proc/PID/smaps wasn't hooked up to it, so looking at /proc/PID/smaps, it shows '??' instead of something intelligable. This can be reached by userspace by simply calling `mlock2(..., MLOCK_ONFAULT);`. Fix this by adding "lf" to denote VM_LOCKONFAULT. Cc: Eric B Munson Cc: Kirill A. Shutemov Cc: Vlastimil Babka Cc: Andrew Morton Fixes: de60f5f10c58 ("mm: introduce VM_LOCKONFAULT") Signed-off-by: Jason A. Donenfeld Acked-by: Vlastimil Babka --- fs/proc/task_mmu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 8a74cdcc9af0..60851e96530b 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -667,6 +667,7 @@ static void show_smap_vma_flags(struct seq_file *m, str= uct vm_area_struct *vma) [ilog2(VM_RAND_READ)] =3D "rr", [ilog2(VM_DONTCOPY)] =3D "dc", [ilog2(VM_DONTEXPAND)] =3D "de", + [ilog2(VM_LOCKONFAULT)] =3D "lf", [ilog2(VM_ACCOUNT)] =3D "ac", [ilog2(VM_NORESERVE)] =3D "nr", [ilog2(VM_HUGETLB)] =3D "ht", --=20 2.38.1