From nobody Sun Jun 14 12:45:20 2026 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 38FBC37DE8D; Thu, 2 Apr 2026 23:59:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.177.32 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775174391; cv=none; b=Xmm61XIjaugdV8Y6pFAfbga1+Vq/pu8XmpKoBGKta1mMoYC8XUsZ2Jc/fI2Pjq6DdiphjxR42wNjdnAr/AmAPJQYL7Xa8x3AaZbh/80jsUeu6Rz0gR4FIHtiw8jh956LvP22y7HD4RTs0ze8/yChW6ijMAi+ITosB4gqxuYpAT0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775174391; c=relaxed/simple; bh=EkvjZohKYDPagbFIRvb4XzQ0yTb1IwYWOILb/TZnjLw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bFkawVVGaLJVkvLialF5Yn3YxXZkeiqBFHeKq++Oizs9dJT7PWCbGa+nPFGMD/oTUGZy6vKR92DSp8sPNmLg5wq6FGPB9FssYtRZwlLCnTdRcsISg79vfSfLPCv4Ff7TA/uoJAwGdzqY1r+CflwKQg6kdMP5QFiu7p1sN0NTpCA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=VGx/hmjN; arc=none smtp.client-ip=205.220.177.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="VGx/hmjN" Received: from pps.filterd (m0246632.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 632Nt1Kx3408690; Thu, 2 Apr 2026 23:59:40 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=corp-2025-04-25; bh=xA8W7 NxanxiabjHJTYARfF4A16zee7Z1/qp/qvyps04=; b=VGx/hmjNvfUBEB5pHm7f8 DjQYIEjdZRkly9Ur3xM1DrIrEanNLdKZ6zlDWoVRSYevRMIdAOoyfCTw/6JbilSI 4B/pmHZUUy0YXISSOfLGVVeMT9CMdGufcksbmxmoB3ov7N26fRtMYy9GWGTl/h86 BSPeQe+fEZtU6lQX1EqJ0NVGm2PmdnBRTH3UwxmlzHLQ2ZwV3Hkt/PtdcGuA5gBw /kMPqYtp1ctswmhfg+3QI3UrDY0jtMUU+jHAX3sSNapYNYOcMnjEgU/PlFZRTFvg UkZnPMnW9yo3SjGwL5LJUvAkxryh2XfUflzlxOwCmS3CDVmhx/JrcXwysA0iY9wO g== Received: from iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta01.appoci.oracle.com [130.35.100.223]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 4d66kr1c4c-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2026 23:59:40 +0000 (GMT) Received: from pps.filterd (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 632KoxLP008476; Thu, 2 Apr 2026 23:59:39 GMT Received: from pps.reinject (localhost [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 4d65ekna81-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2026 23:59:39 +0000 Received: from iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 632Nxb6P011992; Thu, 2 Apr 2026 23:59:39 GMT Received: from localhost.localdomain (ca-dev60.us.oracle.com [10.129.136.27]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 4d65ekna7a-2; Thu, 02 Apr 2026 23:59:39 +0000 From: Anthony Yznaga To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jannh@google.com, pfalcato@suse.de, Jason@zx2c4.com, shuah@kernel.org Subject: [PATCH v2 1/2] mm: fix mmap errno value when MAP_DROPPABLE is not supported Date: Thu, 2 Apr 2026 16:59:32 -0700 Message-ID: <20260402235933.10588-2-anthony.yznaga@oracle.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260402235933.10588-1-anthony.yznaga@oracle.com> References: <20260402235933.10588-1-anthony.yznaga@oracle.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-02_04,2026-04-02_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxlogscore=999 mlxscore=0 phishscore=0 adultscore=0 malwarescore=0 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2603050001 definitions=main-2604020214 X-Authority-Analysis: v=2.4 cv=PqaergM3 c=1 sm=1 tr=0 ts=69cf02ec b=1 cx=c_pps a=zPCbziy225d3KhSqZt3L1A==:117 a=zPCbziy225d3KhSqZt3L1A==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=3I1J8UUJPc9JN9BFgKH3:22 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=8mUEbX9rbSpP1ZQJX6cA:9 a=ZXulRonScM0A:10 cc=ntf awl=host:12291 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDIxNCBTYWx0ZWRfX1kv9f3Z8G2om XCRJV0DHZNDXtZnG6Jr5JZNsATUwgraezaCLHdeZEZ6VH4SnY6iKtKGpMr8wDuk2fCWS25MikwV lkkEDmLqvtrpM7RzVXctZZav5MsPkuT9jr0f9H+JkxKsQlJRVoRVg8ZUDyhHQIuXw0Iw6RnxbFR BzVj0IYhwSkDTnMvDdCHzHX990m/bvgrB1avC4R5gBqfsOwuQce/ROe0i/r6KarWIuG1vkrOv4E M/UTcNbKe4ZxcwPy1Ry6fm4vwT1rs9hq/x2k3g6EddJBLV2OqXGP5eVEM1ASdpJLqlCkPOmkE3E IGrcqkLTUDTJjmLF7epk/tI7kfmH4xVWlSgpV6TbzNLTcFNJcRtHLWbw9kPyFmK5XBoJ9ogw/HE fjXhSgksnVoS/ZYPsGuzaaCQtGA/D6mInPF5QLjYVH7nGOuR3wtqafWQwnJZFW6XuFnZsNPLPjJ 1WW9ucwyFZxhY4GxholNjm4ds1mbgbp8o0j1nGIM= X-Proofpoint-ORIG-GUID: 3JUIj9xm-8FVoRtXmzIk0pKWijSksMh8 X-Proofpoint-GUID: 3JUIj9xm-8FVoRtXmzIk0pKWijSksMh8 Content-Type: text/plain; charset="utf-8" On configs where MAP_DROPPABLE is not supported (currently any 32-bit config except for PPC32), mmap fails with errno set to ENOTSUPP. However, ENOTSUPP is not a standard error value that userspace knows about. The acceptable userspace-visible errno to use is EOPNOTSUPP. checkpatch.pl has a warning to this effect. Fixes: 9651fcedf7b9 ("mm: add MAP_DROPPABLE for designating always lazily f= reeable mappings") Cc: Signed-off-by: Anthony Yznaga Acked-by: Vlastimil Babka (SUSE) Reviewed-by: Lorenzo Stoakes (Oracle) Reviewed-by: Pedro Falcato --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mmap.c b/mm/mmap.c index 5754d1c36462..2311ae7c2ff4 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -504,7 +504,7 @@ unsigned long do_mmap(struct file *file, unsigned long = addr, break; case MAP_DROPPABLE: if (VM_DROPPABLE =3D=3D VM_NONE) - return -ENOTSUPP; + return -EOPNOTSUPP; /* * A locked or stack area makes no sense to be droppable. * --=20 2.47.3 From nobody Sun Jun 14 12:45:20 2026 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AD41A3B8BC1; Thu, 2 Apr 2026 23:59:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.177.32 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775174393; cv=none; b=F7GGOoVVl9q9fWcLQtzz1FaY+P3hQb7gRBxHgFEYR9CtkdTP2dta6tCJVTEIbQdj7a35rwDVVmO3G5Kp1joBWY3lGdpWo+ofByqfmhKLFTI0jk9PaMCKK1IlJr0Ll10LipspaTtNmnSUeG302eohJOeAkLPSX2e82X/YrtRPms8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775174393; c=relaxed/simple; bh=Igf7+7sGmQRd/r/FdnvNwkKW3740cJk8JpNUKAOkMS0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WZ10jcdfDVmDfRbN3XVD4bqyVfGV5vMPTW1ioTZpNXLZtoxomOW8P1p9UzYRfYxIPSYe5e8/dTOFujBdWn1L28A9U2ufhIrNWwKuKDCCCjRN8PSHyQDHx+Q/Jq9jV8OCR05lmGZpwGmud+ny6k4hbARQSdrSS1y7EtwQq90gUbw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=Bye4XgbO; arc=none smtp.client-ip=205.220.177.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="Bye4XgbO" Received: from pps.filterd (m0246631.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 632FBnYc2879362; Thu, 2 Apr 2026 23:59:42 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=corp-2025-04-25; bh=8r3Z9 sl9oUTSLnWJ1fAH6yXNWbaC0iemvsrsKPlZqTE=; b=Bye4XgbOU14RUw+RQe9Rr hly9iVhYrKSpm5cQZxN4393iuVCskcljrpVdfQ2Zl+2WOZyWGf6a4ft0w9h9qwG5 CqsSchUWb2iiBQke9FFs60Yt++/G/a3vonRF8VfvhhOlhxl+cbT97FFIkyAXTIVE J1vBMPtesG5ew+GxoWFJHBwXYX8zkm/LtBSK2DBN6AKf+Bgnrjj50RB/vCj+RrN+ kDsssGmMid9a7b4jsPyyy7YNamQ6yD1tk89TI7escz/Eiso3XIh8zNCroye6Vz2h G7Kn65URNmdnxeeJgk9w/BFaxva2SViD2cr+Mx4Ok2cT652kIMyoCdmRATbxRJf4 A== Received: from iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta01.appoci.oracle.com [130.35.100.223]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 4d65s11dxw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2026 23:59:42 +0000 (GMT) Received: from pps.filterd (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 632KoxLQ008476; Thu, 2 Apr 2026 23:59:41 GMT Received: from pps.reinject (localhost [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 4d65ekna89-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2026 23:59:41 +0000 Received: from iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 632Nxb6R011992; Thu, 2 Apr 2026 23:59:40 GMT Received: from localhost.localdomain (ca-dev60.us.oracle.com [10.129.136.27]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 4d65ekna7a-3; Thu, 02 Apr 2026 23:59:40 +0000 From: Anthony Yznaga To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jannh@google.com, pfalcato@suse.de, Jason@zx2c4.com, shuah@kernel.org Subject: [PATCH v2 2/2] selftests/mm: verify droppable mappings cannot be locked Date: Thu, 2 Apr 2026 16:59:33 -0700 Message-ID: <20260402235933.10588-3-anthony.yznaga@oracle.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260402235933.10588-1-anthony.yznaga@oracle.com> References: <20260402235933.10588-1-anthony.yznaga@oracle.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-02_04,2026-04-02_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxlogscore=999 mlxscore=0 phishscore=0 adultscore=0 malwarescore=0 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2603050001 definitions=main-2604020214 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDIxNCBTYWx0ZWRfX6J72LJy+SDF/ NybwQaUdStmI9xHGIpy2JIgK6NJux6h1L2y8cSjwsdhYHmoAmsrc+9LR2gzgmM+P6/lGFdrfgmA HTlvJ5HCfXSsGmOCdUWqZxHS2yVAL4hnzfJxhCU8qS90ABCS2Zn81FrYVmUkI8ZBLRgiCgTp6O8 m7SgeoDAb9tvmGXE0O/jMSPkN7HGbtWvNlX66NRZnpoCdKo8S/LuR/YJ0ftSm13+S9WVvlUZi3E mxPg9nH31s8Xnk1mN9D6lfqP1hMaLYFYtbkm8wCQZmA2XuBG/F/Du1Ecx6mvrzbBf+oL0D9Tl7g u0I9V0X+YiAgrsGeDqfRxfijrqHV6kKPO913lv1rH54JhLrzN/Kqki2ew5HXYfXzbVSxm8txfB+ lG9yXhKWdbT0tXy/+iKC7EgYN4zzpqoTATay5rV77+7NeMRWpBdh8ELd5bk54y5SwFMAizjnL9S gk2+QFP6GBr+wXSlrQi9jvopsK1Ih2iHw2GT4eYQ= X-Proofpoint-ORIG-GUID: XLamt7WrgjBa-D-1jgURnDm02QIwO6h7 X-Authority-Analysis: v=2.4 cv=BvOQAIX5 c=1 sm=1 tr=0 ts=69cf02ee b=1 cx=c_pps a=zPCbziy225d3KhSqZt3L1A==:117 a=zPCbziy225d3KhSqZt3L1A==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=o5oIOnhZENCTenyL_yNV:22 a=yPCof4ZbAAAA:8 a=_qCjRXgy2aYRKG6zBr8A:9 cc=ntf awl=host:12291 X-Proofpoint-GUID: XLamt7WrgjBa-D-1jgURnDm02QIwO6h7 Content-Type: text/plain; charset="utf-8" For configs that support MAP_DROPPABLE verify that a mapping created with MAP_DROPPABLE cannot be locked via mlock(), and that it will not be locked if it's created after mlockall(MCL_FUTURE). Signed-off-by: Anthony Yznaga --- tools/testing/selftests/mm/mlock2-tests.c | 87 ++++++++++++++++++++--- 1 file changed, 78 insertions(+), 9 deletions(-) diff --git a/tools/testing/selftests/mm/mlock2-tests.c b/tools/testing/self= tests/mm/mlock2-tests.c index b474f2b20def..353d0e5daa44 100644 --- a/tools/testing/selftests/mm/mlock2-tests.c +++ b/tools/testing/selftests/mm/mlock2-tests.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include +#include #include #include #include @@ -163,14 +164,17 @@ static int lock_check(unsigned long addr) return (vma_rss =3D=3D vma_size); } =20 -static int unlock_lock_check(char *map) +static int unlock_lock_check(char *map, bool mlock_supported) { - if (is_vmflag_set((unsigned long)map, LOCKED)) { + if (!is_vmflag_set((unsigned long)map, LOCKED)) + return 0; + + if (mlock_supported) ksft_print_msg("VMA flag %s is present on page 1 after unlock\n", LOCKED= ); - return 1; - } + else + ksft_print_msg("VMA flag %s is present on an unsupported VMA\n", LOCKED); =20 - return 0; + return 1; } =20 static void test_mlock_lock(void) @@ -196,7 +200,7 @@ static void test_mlock_lock(void) ksft_exit_fail_msg("munlock(): %s\n", strerror(errno)); } =20 - ksft_test_result(!unlock_lock_check(map), "%s: Unlocked\n", __func__); + ksft_test_result(!unlock_lock_check(map, true), "%s: Unlocked\n", __func_= _); munmap(map, 2 * page_size); } =20 @@ -296,7 +300,7 @@ static void test_munlockall0(void) ksft_exit_fail_msg("munlockall(): %s\n", strerror(errno)); } =20 - ksft_test_result(!unlock_lock_check(map), "%s: No locked memory\n", __fun= c__); + ksft_test_result(!unlock_lock_check(map, true), "%s: No locked memory\n",= __func__); munmap(map, 2 * page_size); } =20 @@ -336,7 +340,70 @@ static void test_munlockall1(void) ksft_exit_fail_msg("munlockall() %s\n", strerror(errno)); } =20 - ksft_test_result(!unlock_lock_check(map), "%s: No locked memory\n", __fun= c__); + ksft_test_result(!unlock_lock_check(map, true), "%s: No locked memory\n",= __func__); + munmap(map, 2 * page_size); +} + +/* + * Droppable memory should not be lockable. + */ +static void test_mlock_droppable(void) +{ + char *map; + unsigned long page_size =3D getpagesize(); + + /* + * Ensure MCL_FUTURE is not set. + */ + if (munlockall()) { + ksft_test_result_fail("munlockall() %s\n", strerror(errno)); + return; + } + + map =3D mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0); + if (map =3D=3D MAP_FAILED) { + if (errno =3D=3D EOPNOTSUPP) + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); + else + ksft_test_result_fail("mmap error: %s\n", strerror(errno)); + return; + } + + if (mlock2_(map, 2 * page_size, 0)) + ksft_test_result_fail("mlock2(0): %s\n", strerror(errno)); + else + ksft_test_result(!unlock_lock_check(map, false), + "%s: droppable memory not locked\n", __func__); + + munmap(map, 2 * page_size); +} + +static void test_mlockall_future_droppable(void) +{ + char *map; + unsigned long page_size =3D getpagesize(); + + if (mlockall(MCL_CURRENT | MCL_FUTURE)) { + ksft_test_result_fail("mlockall(MCL_CURRENT | MCL_FUTURE): %s\n", strerr= or(errno)); + return; + } + + map =3D mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0); + + if (map =3D=3D MAP_FAILED) { + if (errno =3D=3D EOPNOTSUPP) + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); + else + ksft_test_result_fail("mmap error: %s\n", strerror(errno)); + return; + } + + ksft_test_result(!unlock_lock_check(map, false), "%s: droppable memory no= t locked\n", + __func__); + + munlockall(); munmap(map, 2 * page_size); } =20 @@ -442,7 +509,7 @@ int main(int argc, char **argv) =20 munmap(map, size); =20 - ksft_set_plan(13); + ksft_set_plan(15); =20 test_mlock_lock(); test_mlock_onfault(); @@ -451,6 +518,8 @@ int main(int argc, char **argv) test_lock_onfault_of_present(); test_vma_management(true); test_mlockall(); + test_mlock_droppable(); + test_mlockall_future_droppable(); =20 ksft_finished(); } --=20 2.47.3