From mboxrd@z Thu Jan 1 00:00:00 1970 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0FBCBFF885A for ; Mon, 4 May 2026 08:25:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A70386B0099; Mon, 4 May 2026 04:25:52 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A22506B009B; Mon, 4 May 2026 04:25:52 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 89A086B009D; Mon, 4 May 2026 04:25:52 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 769616B0099 for ; Mon, 4 May 2026 04:25:52 -0400 (EDT) Received: from smtpin08.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 29A17A02DA for ; Mon, 4 May 2026 08:25:52 +0000 (UTC) X-FDA: 84729054144.08.00EB0A7 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by imf16.hostedemail.com (Postfix) with ESMTP id 9F144180004 for ; Mon, 4 May 2026 08:25:49 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=PdTov3oS; spf=pass (imf16.hostedemail.com: domain of sayalip@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=sayalip@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1777883149; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=moIJIypDjtmZnGtHAK76laQuaSh8Y71cRRNVJavHh8k=; b=YgYwum4FQcDWILXXMf+7ONuEyJrbLzIDFBNobeFSFSXmhgpY6COumo+w1yYrInu8rSQMLP oJSlrCJyhhIeGugwqk+I8VyOUkz56tdTAor858T8Wr/+B468dAnHx1Eo5ycCGRlddpF7ic UTmjILXkA+nG77m9FPHR06Yoz9wBBRM= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=PdTov3oS; spf=pass (imf16.hostedemail.com: domain of sayalip@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=sayalip@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1777883149; a=rsa-sha256; cv=none; b=N13PvPSAe9GSV7Xd9P407w5YRU3NnYltOONBrnOdMOsdgyUd6VWnsSTknDQsBjXqGJoCHX IkquFdqVlZxHnRsAlMCdrz8fdMGzMrUQh2mu15cj409NcGoK7mxd2IxkRhg78mPdCJDekh +QI/VN5cZMk+6nLHJnDzZN+GkSEmKuM= Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 643InOlO2280958; Mon, 4 May 2026 08:25:41 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=moIJIypDjtmZnGtHA K76laQuaSh8Y71cRRNVJavHh8k=; b=PdTov3oSiXlEpY/JsU5ShLROWVd8FlVNT JXzIb8pHtJ1jTIuivkx8AED+4DEfEXdxf+rkIxL9HpGOATFy8f8eACteugmZSELS Z67i4ZxdQch7M/cpM2Qep2PUv7C+tbeEMR6SEuZrNrN48rN5udlg9B4QLgCJoQVJ IzIGI+3pBjAi9+Mtk/7y6WjlfmRW0aj/TXzJ22z43yes8xj6wUkc1j7oZQ8QElLp V9wnnhl3xddZX8KfFP3WGW7BTP6sB3YVXTC4NbMmV4S4KGFZgq/6CLdHUZHPtM89 gSPBhPBjnzk2kFWCnhxfAQ2knAucNW/OG2iwIR0GbD1yRntFgdabQ== Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4dw9x4e3s1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 04 May 2026 08:25:40 +0000 (GMT) Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.18.1.7/8.18.1.7) with ESMTP id 6448OOd7023531; Mon, 4 May 2026 08:25:39 GMT Received: from smtprelay04.fra02v.mail.ibm.com ([9.218.2.228]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4dwuyvve9j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 04 May 2026 08:25:39 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay04.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 6448PatS26018426 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 4 May 2026 08:25:36 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 00DE22004B; Mon, 4 May 2026 08:25:36 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 06D7120043; Mon, 4 May 2026 08:25:33 +0000 (GMT) Received: from li-3f69264c-2ce6-11b2-a85c-c3f414d24014.bl1-in.ibm.com (unknown [9.123.3.209]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 4 May 2026 08:25:32 +0000 (GMT) From: Sayali Patil To: Andrew Morton , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani Cc: David Hildenbrand , Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org, Miaohe Lin , Venkat Rao Bagalkote , Sayali Patil Subject: [PATCH v6 09/14] selftest/mm: register existing mapping with userfaultfd in hugepage-mremap Date: Mon, 4 May 2026 13:54:46 +0530 Message-ID: X-Mailer: git-send-email 2.52.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA0MDA4NyBTYWx0ZWRfX3QI6zhoFeIPq Jhy3gEWfDVdNkdSQUQzVq7BcVcFRIJQ7lh8FTHqmQHoUcnRZw1dyO/46epImoRqwPemPFcdaVg2 dL4lFQsGp8cL2gA7ZZfD7s9mLhe9l7dTRVVC4SBuK12TMK0Lra8faFC0N1Ln3X+3e5d/RW6G7JV 87RYalSH1dAL0eYjOa5K7mFya4sACGZNkK2eXCvWtaKJ57f4gUfv1Txrh9dCkDIqm+V61nljp1y /+hrTQvZGx7e4BiiI5JGDAzATVwQlFeR7vzID3xZmFWMf/w0I9LaFSv0Wg5XUIYErBRflyqWJ8T YhDxaKCE5RTTr1QxdnXKKhJOol9eNIK2x0+En4oyT80B0SC+9bICMGTa/WKALzfspDVJ7xevssi mLIS/u6axU/yDY2pgZYkycnTbwhUSlWWFVwq/Zuc8jBO4NsvH5vJXkz3RkST6yyCNvVy6ZlPCjh vfD7RDTEEjCXTYfe/0g== X-Proofpoint-ORIG-GUID: uPn6RHkmEbhPoeqYvp2cKeh83IV8X9Y5 X-Proofpoint-GUID: wfQhWfwlxQb2Uk9D0i_52QNHqRi6jSjT X-Authority-Analysis: v=2.4 cv=W7UIkxWk c=1 sm=1 tr=0 ts=69f85805 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=gVE5Qc0x_BWLnb-D2gsA:9 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=2026-05-04_03,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 spamscore=0 clxscore=1015 phishscore=0 bulkscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605040087 X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 9F144180004 X-Stat-Signature: t8r1bt5ht7gx871qraidda5xnootif43 X-HE-Tag: 1777883149-428677 X-HE-Meta: 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 SzI9rGy7 SATIsgDrfZihUD7exOkXosVNjNO40GTrcgdO6XWApB3RspvF/4WEO9hPcCkmtEgo934r7V2VXOmlRjhbfETPjCcWbzXDDRZe7Feqsa0i4z1ju8z7+cyC2fFKsi0GGoiy4sSjP8X2LasMM0uog2kvoM2d0uMc+9cZCsw7FwNCOU4LaQ0wVdQeFNhhCkoCCl8k4sYD0f3gC8q1IqB/ijDStj529HLJgNU1FdiEZx0QXpY7MGV1Pl55KA9RNyHMsDlM+2DaNeWps3WM6IHvG4PwrLArXBazk08kHadnv7hPoQaUA2RQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Previously, register_region_with_uffd() created a new anonymous mapping and overwrote the address supplied by the caller before registering the range with userfaultfd. As a result, userfaultfd was applied to an unrelated anonymous mapping instead of the hugetlb region used by the test. Remove the extra mmap() and register the caller-provided address range directly using UFFDIO_REGISTER_MODE_MISSING, so that faults are generated for the hugetlb mapping used by the test. This ensures userfaultfd operates on the actual hugetlb test region and validates the expected fault handling. Before patch: running ./hugepage-mremap ------------------------- TAP version 13 1..1 Map haddr: Returned address is 0x7eaa40000000 Map daddr: Returned address is 0x7daa40000000 Map vaddr: Returned address is 0x7faa40000000 Address returned by mmap() = 0x7fff9d000000 Mremap: Returned address is 0x7faa40000000 First hex is 0 First hex is 3020100 ok 1 Read same data Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 [PASS] ok 1 hugepage-mremap After patch: running ./hugepage-mremap ------------------------- TAP version 13 1..1 Map haddr: Returned address is 0x7eaa40000000 Map daddr: Returned address is 0x7daa40000000 Map vaddr: Returned address is 0x7faa40000000 Registered memory at address 0x7eaa40000000 with userfaultfd Mremap: Returned address is 0x7faa40000000 First hex is 0 First hex is 3020100 ok 1 Read same data Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 [PASS] ok 1 hugepage-mremap Fixes: 12b613206474 ("mm, hugepages: add hugetlb vma mremap() test") Acked-by: David Hildenbrand (Arm) Tested-by: Venkat Rao Bagalkote Signed-off-by: Sayali Patil --- tools/testing/selftests/mm/hugepage-mremap.c | 21 +++++--------------- 1 file changed, 5 insertions(+), 16 deletions(-) diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/selftests/mm/hugepage-mremap.c index f66e4d806477..68c35d1d8a5f 100644 --- a/tools/testing/selftests/mm/hugepage-mremap.c +++ b/tools/testing/selftests/mm/hugepage-mremap.c @@ -86,25 +86,14 @@ static void register_region_with_uffd(char *addr, size_t len) if (ioctl(uffd, UFFDIO_API, &uffdio_api) == -1) ksft_exit_fail_msg("ioctl-UFFDIO_API: %s\n", strerror(errno)); - /* Create a private anonymous mapping. The memory will be - * demand-zero paged--that is, not yet allocated. When we - * actually touch the memory, it will be allocated via - * the userfaultfd. - */ - - addr = mmap(NULL, len, PROT_READ | PROT_WRITE, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (addr == MAP_FAILED) - ksft_exit_fail_msg("mmap: %s\n", strerror(errno)); - - ksft_print_msg("Address returned by mmap() = %p\n", addr); - - /* Register the memory range of the mapping we just created for - * handling by the userfaultfd object. In mode, we request to track - * missing pages (i.e., pages that have not yet been faulted in). + /* Register the passed memory range for handling by the userfaultfd object. + * In mode, we request to track missing pages + * (i.e., pages that have not yet been faulted in). */ if (uffd_register(uffd, addr, len, true, false, false)) ksft_exit_fail_msg("ioctl-UFFDIO_REGISTER: %s\n", strerror(errno)); + + ksft_print_msg("Registered memory at address %p with userfaultfd\n", addr); } int main(int argc, char *argv[]) -- 2.52.0