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Fri, 7 Apr 2023 11:08:58 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 178FD20043; Fri, 7 Apr 2023 11:08:58 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D457420040; Fri, 7 Apr 2023 11:08:56 +0000 (GMT) Received: from linux.ibm.com (unknown [9.171.71.120]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTPS; Fri, 7 Apr 2023 11:08:56 +0000 (GMT) Date: Fri, 7 Apr 2023 14:08:54 +0300 From: Mike Rapoport To: Peter Xu Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrea Arcangeli , David Hildenbrand , Andrew Morton , Nadav Amit , Mike Kravetz , Axel Rasmussen , Leonardo Bras Soares Passos , Mike Rapoport Subject: Re: [PATCH 14/29] selftests/mm: uffd_[un]register() Message-ID: References: <20230330155707.3106228-1-peterx@redhat.com> <20230330160747.3107258-1-peterx@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230330160747.3107258-1-peterx@redhat.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: HNi-KUOAMRK0qcaaCGkQybF7T9INWr-z X-Proofpoint-ORIG-GUID: PCMIwhncLIeqnP0UjHaF_-w7_OKaSvmH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-04-07_06,2023-04-06_03,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 bulkscore=0 impostorscore=0 lowpriorityscore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 priorityscore=1501 spamscore=0 malwarescore=0 adultscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2304070100 X-Rspamd-Queue-Id: 3E5831C0009 X-Stat-Signature: jw1m9s6mbn4j8o1iqfci7kqgpm7dchmm X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1680865744-971596 X-HE-Meta: U2FsdGVkX19/asCdUDTIUl8F93tBAhUe0J1b2H9btIz9sn7A4qmroNBM1wALhs79wR41UBzdc3IKEGboSgacp9NT8DOPJWEN+RhoKYiRZaPq/x2Iiwepuf97Tzt5F/IFp+pBIpyyjjX/t527PE9MZBnsesl4md5zBNDyvge4qN7HFufKuB/r8EFZSIPAR6R+LP70NLGReBwpKbwuDSQZAmoV8YlqISb6R60674RxOejlZ4yL47NVWDPveaKOlCinQheGSyFozXx19uvV6CocesZaLIk9i3QKSjQBVvF1G4w0BL0BkyeXIkzeJwI3UuAtaxcoVGdH8eHYXhXVp341SUktC1uNkm9GyszIRxE3s50N7UFXXjkmp7zKhY8wh6XGggUT73Z7gb5B59wqd9HtaMhUmMyfD6c3DBBP7ulnw5VvLKHbGJXQYXf8fL6Crof2NB3pB+FfUQX84iZT6Ce2MNsbnC/zilT2nTqFA0vgOZ1R/rjVSs4k4auHLaMZtJesv1Sbfph++/Giv8lm/bRo1BzYjPMebtJuyKwHHmYFvt/Xp9fHwfflmwk8ZiRON4ZVWDRq8SbqY057Ql73FXlG+FGMe7MPsO8zDhRaFuxR4XWevogJYpv53Eq162LjDGyrjyD5uQYHS4/FFlfpDZ5HWF+mQ7VkxPm1qmer/8YqWJrieab7LUsCIWqAwilnJxuoyG2ekzykEeg4isbbjG8UoGuYwmQRuW7OAOEibEx142O41fi2jLUdpBHKD8clR3HPYZHwZWqd8ss6j9yxItDgN/56kGVKMyPuaPOBVdNnvpxDXCzfuFumEhiCGED09BttUcbwpBDRvy5qCHYmwYtRyU4LmcCFR4M2n0CiffYTEmqB7bHPTmg/Cvmen90krEmQLJw+7lSe1nWGEnRQtNURrp4pJYZWiARvYHY47M2PzU6thE9Pa+rQefu4LQgs7QCjTJqx70BCqzRJoIM65R4 dKYtZWUB 6b60gvklSGaibhhOM5uqBs04knT++Xd4aVTVFJXlQBslunIN8yrbLMVSpOVMWbeAXRBLLyAGPJA2I2PUhDExjGsWJjJtmDoF3ingnCBdL9F7bwiWoS0IiSdYRzOhJ0UCfTfIXRQZ4o+iXNJeszFNGMolYz1Nov9A1RpCm+GMhwMKrpUwZMbSUYwl5g9pDzib+TiqIQSy8/EZYdBwy1/2a41lYwbzSBwt1gph32Bq2mA0laOmC5oqxOnQwb294QooBkQHqBnVGsvV9AiZ5MBtBYzfXl4XBTFDwEI79KGrU1xHL3DI2TtIvDJjUYq5UM+ejUNDz X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Mar 30, 2023 at 12:07:47PM -0400, Peter Xu wrote: > Add two helpers to register/unregister to an uffd. Use them to drop > duplicate codes. > > This patch also drops assert_expected_ioctls_present() and > get_expected_ioctls(). Reasons: > > - It'll need a lot of effort to pass test_type==HUGETLB into it from the > upper, so it's the simplest way to get rid of another global var > > - The ioctls returned in UFFDIO_REGISTER is hardly useful at all, because > any app can already detect kernel support on any ioctl via its > corresponding UFFD_FEATURE_*. The check here is for sanity mostly but > it's probably destined no user app will even use it. > > - It's not friendly to one future goal of uffd to run on old kernels, the > problem is get_expected_ioctls() compiles against UFFD_API_RANGE_IOCTLS, > which is a value that can change depending on where the test is compiled, > rather than reflecting what the kernel underneath has. It means it'll > report false negatives on old kernels so it's against our will. > > So let's make our live easier. > > Signed-off-by: Peter Xu > --- > tools/testing/selftests/mm/hugepage-mremap.c | 7 +- > .../selftests/mm/ksm_functional_tests.c | 6 +- > tools/testing/selftests/mm/uffd-common.c | 28 +------ > tools/testing/selftests/mm/uffd-common.h | 2 - > tools/testing/selftests/mm/uffd-stress.c | 83 +++++-------------- > tools/testing/selftests/mm/vm_util.c | 37 +++++++++ > tools/testing/selftests/mm/vm_util.h | 7 ++ > 7 files changed, 66 insertions(+), 104 deletions(-) > > diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/selftests/mm/hugepage-mremap.c > index e53b5eaa8fce..2084692fe1c4 100644 > --- a/tools/testing/selftests/mm/hugepage-mremap.c > +++ b/tools/testing/selftests/mm/hugepage-mremap.c > @@ -60,7 +60,6 @@ static void register_region_with_uffd(char *addr, size_t len) > { > long uffd; /* userfaultfd file descriptor */ > struct uffdio_api uffdio_api; > - struct uffdio_register uffdio_register; > > /* Create and enable userfaultfd object. */ > > @@ -96,11 +95,7 @@ static void register_region_with_uffd(char *addr, size_t len) > * handling by the userfaultfd object. In mode, we request to track > * missing pages (i.e., pages that have not yet been faulted in). > */ > - > - uffdio_register.range.start = (unsigned long)addr; > - uffdio_register.range.len = len; > - uffdio_register.mode = UFFDIO_REGISTER_MODE_MISSING; > - if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register) == -1) { > + if (uffd_register(uffd, addr, len, true, false, false)) { I'd replace booleans with a bit flags as it easier to read. Other than that LGTM. > perror("ioctl-UFFDIO_REGISTER"); > exit(1); > } -- Sincerely yours, Mike.