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Thu, 25 Jun 2026 12:40:55 +0000 (GMT) Received: from li-3f69264c-2ce6-11b2-a85c-c3f414d24014.ibm.com.com (unknown [9.39.21.143]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 25 Jun 2026 12:40:55 +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 1/2] selftests/mm: handle EINVAL when configuring gigantic hugepages Date: Thu, 25 Jun 2026 18:10:16 +0530 Message-ID: <8bfa921e30eb94072685103f6496784aa23bb166.1782365671.git.sayalip@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=I4VVgtgg c=1 sm=1 tr=0 ts=6a3d21e0 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=BH8Sa3jHzDjv_dfq7kQA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjI1MDEwNiBTYWx0ZWRfX1nVmDDdRv9Ya aKQMIG6CeqWls2DhWDooBvBnH9rf1Tvj3U86aJk8eju75M9GgeZekbqYMZ5MbcCz5E/heJbF2fQ gJcXtvqLFitVg2zpw5hh2Oogn8kBdDTZ0j9EmGcLk3Ec3jLhHNeUS+u97vQ4fLkRaTqWjDAmA8n eG8YOJ4M/5ehobMDozG90QP0l9ThIrr+53qOK0mxwcyBXJDoBqGH33+dF08lfhWiRLOUMKA6tlw WGvmIYai1U73+xnCtAOM9pe8YUEDHsO7lnq3RHm+U6zq6cH/mQcDh+GA2cIlw9Xd4cD7mPqzqDq yo99ppHH9GKdZo9BoJ+aD+1UHJwQZRCp1EqMdzkDhr9qQVxlyBYp/QujlL/gu/KcmmvlV05CHNy shn/ua4Ku74rnduw84CvVEjG8MT8pHljLLvs4xwJr+yy247p9A0PY9QKDd8A4ui70RLIx+5lRKb LQYEwNozRFx1aCQqO0A== X-Proofpoint-GUID: 0ck7acKIWgQNDdBNXuyFfJ7Rh2vv9q4y X-Proofpoint-ORIG-GUID: Fk3ArSV7aga3Sj3uoTWpxyn9NwBwXYQV X-Proofpoint-Spam-Info: AW1haW4tMjYwNjI1MDEwNiBTYWx0ZWRfX6tq/9m+kgMW5 Y4d/2sIhk9ymXDuFyDBk352ypuPhe1WUdWyMiz6jX7VSgwkVeuuc7a07rmg8tLDg0OZ9wt5Ktoy 7mRPusNlvHgXHeXMs/EopsrCVo7Kl+I= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-25_01,2026-06-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 impostorscore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 priorityscore=1501 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606250106 Some MM selftests attempt to configure the amount of HugeTLB pages of different sizes by writing to nr_hugepages. PowerPC hash MMU pSeries systems advertise gigantic hugepage sizes but do not support runtime allocation of such pages, writes to the corresponding nr_hugepages file fail with -EINVAL. This causes the test to bail out even though the failure is due to a platform limitation rather than the functionality being tested. Treat -EINVAL from the sysfs write as a skipped configuration request and continue running the test instead of failing. Before patch: ------------------------- running ./hugetlb-madvise ------------------------- TAP version 13 1..1 [INFO] detected hugetlb page size: 16777216 KiB [INFO] detected hugetlb page size: 16384 KiB ok 1 MADV_DONTNEED and MADV_REMOVE on hugetlb Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 Bail out! /sys/kernel/mm/hugepages/hugepages-16777216kB/nr_hugepages write(0) failed: Invalid argument Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 [FAIL] After patch: ------------------------- running ./hugetlb-madvise ------------------------- TAP version 13 1..1 [INFO] detected hugetlb page size: 16777216 KiB [INFO] detected hugetlb page size: 16384 KiB ok 1 MADV_DONTNEED and MADV_REMOVE on hugetlb Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 /sys/kernel/mm/hugepages/hugepages-16777216kB/nr_hugepages write(0) failed: Invalid argument [PASS] Fixes: 9d07250ea1eb ("selftests/mm: hugepage_settings: add APIs to get and set nr_hugepages") Signed-off-by: Sayali Patil --- tools/testing/selftests/mm/vm_util.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index 311fc5b4513e..a8f16eef5c7c 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -735,6 +735,13 @@ void write_file(const char *path, const char *buf, size_t buflen) saved_errno = errno; close(fd); errno = saved_errno; + + if (numwritten < 0 && errno == EINVAL) { + ksft_print_msg("%s write(%.*s) failed: %s\n", path, + (int)(buflen - 1), buf, strerror(errno)); + return; + } + if (numwritten < 0) ksft_exit_fail_msg("%s write(%.*s) failed: %s\n", path, (int)(buflen - 1), buf, strerror(errno)); -- 2.52.0