From nobody Wed Oct 8 09:24:02 2025 Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) (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 5C4D41E2858; Mon, 30 Jun 2025 10:25:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.112 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751279123; cv=pass; b=l2F8wnt6wdWSIy+qijv5VY0EfHnFiwHv5f78JotrEragvj1go4ss4Rp5B7noIjHtWbLIyoNe/5xHIhigh23vR/CaRttkpuXrrScdNCsMw/x1tr9sZQdAU5bBPUKqqB5tK/cZAHO6NMdowKYoAFhZZEbsFC1bvFH3PGnNhW4wHEo= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751279123; c=relaxed/simple; bh=pIec2uRujmt1WMqVydkBXQSel8wTBLV0+sgYDEDHZIQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=FtGB6a8Xe78O+ai07Xpjj6stjOob4nByDn6o+ipzN5i+sfumgtVk4h6GMUvJZFcbv36tO62qwdcqnb4LRL+NXVcU/WQ9lZkaebDpHDQo1LjXTU/3orhwFbXfPWzHnHxZ9hLpqvwOHmmpZhXL786X822E6pAObokU8B0GjfQzeLQ= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=usama.anjum@collabora.com header.b=DfI8HVR7; arc=pass smtp.client-ip=136.143.188.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=usama.anjum@collabora.com header.b="DfI8HVR7" ARC-Seal: i=1; a=rsa-sha256; t=1751279104; cv=none; d=zohomail.com; s=zohoarc; b=G0beHDLVv+/Ffycsq5m2pVM4PZKgW0NbssB+zOfPFZL2AD8qIx5IpXwZIrmrenobNvk+4mSkF6xEWVuZkaX8EKpJ1TH4cuwvOJ++9bQaYoCOrz/W6lleoBD4KKJnEcYH6cKHnVpbxPklsis5KF+W0Ujsw+wimjTdPx3Y00Euhxo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1751279104; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:MIME-Version:Message-ID:Subject:Subject:To:To:Message-Id:Reply-To; bh=cpPJV8/hADr82PgAqaYBF0nyZvBsZKRCuN6YMIHqdcE=; b=AZmT/28hE5MjevYWpzItdm9xJu3ytA3v+c6BBSQy/CAv3u/9ZXzDBbwMWXSamhXpBwnAhfGSYbihFIrgXYC89/tBZtDsZziV9EARk+DyWMwHXJp3a4j7GvD/MIylQuYHH2srgw+XhFN3th7aJ3HYPMdmDHB0m5lcI/L6549egrs= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=usama.anjum@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1751279104; s=zohomail; d=collabora.com; i=usama.anjum@collabora.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:MIME-Version:Content-Transfer-Encoding:Message-Id:Reply-To; bh=cpPJV8/hADr82PgAqaYBF0nyZvBsZKRCuN6YMIHqdcE=; b=DfI8HVR7ASoe0e4njpTNc3CHsUcpAB4jvqBmmzCyKFdsTAr8W+TbFy9BDWnTnDY8 k5CPq340DAKKjDEeDI7AU0e4LL8meXj+9JzTAZsJv+zm5tfnNx0xaWLa0gYLslJBgD0 1WbS1MXVuxE1Yd6y5IZB50gyef/dSK1Bajs1fGS4= Received: by mx.zohomail.com with SMTPS id 1751279102242736.6456034251825; Mon, 30 Jun 2025 03:25:02 -0700 (PDT) From: Muhammad Usama Anjum To: Andrew Morton , Shuah Khan Cc: Muhammad Usama Anjum , kernel@collabora.com, David Hildenbrand , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] selftests/mm: pagemap_scan ioctl: add PFN ZERO test cases Date: Mon, 30 Jun 2025 15:24:42 +0500 Message-ID: <20250630102443.137809-1-usama.anjum@collabora.com> X-Mailer: git-send-email 2.43.0 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-ZohoMailClient: External Content-Type: text/plain; charset="utf-8" Add test cases to test the correctness of PFN ZERO flag of pagemap_scan ioctl. Test with normal pages backed memory and huge pages backed memory. Cc: David Hildenbrand Signed-off-by: Muhammad Usama Anjum --- The bug has been fixed [1]. [1] https://lore.kernel.org/all/20250617143532.2375383-1-david@redhat.com --- tools/testing/selftests/mm/pagemap_ioctl.c | 57 +++++++++++++++++++++- 1 file changed, 56 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/sel= ftests/mm/pagemap_ioctl.c index 57b4bba2b45f3..6138de0087edf 100644 --- a/tools/testing/selftests/mm/pagemap_ioctl.c +++ b/tools/testing/selftests/mm/pagemap_ioctl.c @@ -1,4 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 + #define _GNU_SOURCE #include #include @@ -1480,6 +1481,57 @@ static void transact_test(int page_size) extra_thread_faults); } =20 +void zeropfn_tests(void) +{ + unsigned long long mem_size; + struct page_region vec; + int i, ret; + char *mem; + + /* Test with page backed memory */ + mem_size =3D 10 * page_size; + mem =3D mmap(NULL, mem_size, PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem =3D=3D MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + + /* Touch each page to ensure it's mapped */ + for (i =3D 0; i < mem_size; i +=3D page_size) + (void)((volatile char *)mem)[i]; + + ret =3D pagemap_ioctl(mem, mem_size, &vec, 1, 0, + (mem_size / page_size), PAGE_IS_PFNZERO, 0, 0, PAGE_IS_PFNZERO); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret =3D=3D 1 && LEN(vec) =3D=3D (mem_size / page_size), + "%s all pages must have PFNZERO set\n", __func__); + + munmap(mem, mem_size); + + /* Test with huge page */ + mem_size =3D 10 * hpage_size; + mem =3D memalign(hpage_size, mem_size); + if (!mem) + ksft_exit_fail_msg("error nomem\n"); + + ret =3D madvise(mem, mem_size, MADV_HUGEPAGE); + if (ret) + ksft_exit_fail_msg("madvise failed %d %s\n", errno, strerror(errno)); + + for (i =3D 0; i < mem_size; i +=3D hpage_size) + (void)((volatile char *)mem)[i]; + + ret =3D pagemap_ioctl(mem, mem_size, &vec, 1, 0, + (mem_size / page_size), PAGE_IS_PFNZERO, 0, 0, PAGE_IS_PFNZERO); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret =3D=3D 1 && LEN(vec) =3D=3D (mem_size / page_size), + "%s all huge pages must have PFNZERO set\n", __func__); + + free(mem); +} + int main(int __attribute__((unused)) argc, char *argv[]) { int shmid, buf_size, fd, i, ret; @@ -1494,7 +1546,7 @@ int main(int __attribute__((unused)) argc, char *argv= []) if (init_uffd()) ksft_exit_pass(); =20 - ksft_set_plan(115); + ksft_set_plan(117); =20 page_size =3D getpagesize(); hpage_size =3D read_pmd_pagesize(); @@ -1669,6 +1721,9 @@ int main(int __attribute__((unused)) argc, char *argv= []) /* 16. Userfaultfd tests */ userfaultfd_tests(); =20 + /* 17. ZEROPFN tests */ + zeropfn_tests(); + close(pagemap_fd); ksft_exit_pass(); } --=20 2.43.0