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Fri, 13 Mar 2026 14:16:59 +0000 (GMT) Message-ID: <1f944b56-acb6-44ee-8cc2-6031fcedaeaa@linux.ibm.com> Date: Fri, 13 Mar 2026 19:46:58 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 00/13] selftests/mm: fix failures and robustness improvements To: Andrew Morton Cc: Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani , David Hildenbrand , Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org References: <20260312150526.3662b2717b9a91776a2e43f5@linux-foundation.org> Content-Language: en-IN From: Sayali Patil In-Reply-To: <20260312150526.3662b2717b9a91776a2e43f5@linux-foundation.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=QKtlhwLL c=1 sm=1 tr=0 ts=69b41c62 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=YdAoJE3rqbStyI-1upkA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzEzMDExMiBTYWx0ZWRfX2vRLn5fFjDGH e7ZBS7DlBp3DH3an/kn0qFOSrvVmI/70hmKoAoNhMP71PeN4a1Lsgm+uGlyNFFaJ+Ll0zHp2g2P TPT9mHE5ApJ/tJ/9IikbHY48V27tlt9VmvlC+IcAPgN5OgZSguNwro9U+VAT6xlKAHi3r5zCKQV mYzUirBbhGuryEnVNNW6EHXUiQqNPYoKbnGYHqnO1ZkEn0PGOjrrqlV39D3/Ttx2giT5S/b5Ob4 pRO/CNIJmrYqxPUrrEkBImJUXoGsSQlEQDWkl80jiSu4Oo8hz2eR5bc7lpXpxBmwUahXBZ6mrOg UxFQvZSeEghFNQvk0eVKKDaFpGR+cPWJzWaVVVE+WUu5hg1k7yVRjoJ3iOi2T6ObMc2bOYSEjw9 v6OYxj0lIwH7zsZNWwIgzKve7Z5e8+CGjsYGYe+I4fKB3/kHrnr3TZiNuOORsGdWQNN9jhqJX9b 3UiTK5fxrBtnxBgX0eA== X-Proofpoint-ORIG-GUID: EKxMMvXJO_-Q6FuTg3Mm2n_bv_9p0Ewp X-Proofpoint-GUID: _FoW35RApTu9sZVdSSuEqYmN99KNbMEq 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=2026-03-13_02,2026-03-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 impostorscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 adultscore=0 phishscore=0 spamscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603130112 X-Rspam-User: X-Stat-Signature: r3bc9w5cwixjtyfmb45z3zj1nsaqzidq X-Rspamd-Queue-Id: 0D3D74001B X-Rspamd-Server: rspam03 X-HE-Tag: 1773411431-155277 X-HE-Meta: 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 Sf7yR2lw CShGCjEEoA8d7e4MqsJ9Eot6Hc3lOKeHqjGnNy/ti18VcDwkgQvfbGBgkIAvzZftyCCVQ/doc66ByobBruwtFWEkl4XlS0FCzPlbFIin5mNwXWP16WsWhTsqVRf7LHg2rCYdLBflioLyTQQMT1Q8zZ6BvjJFBdzaOO++NKuK0JSyQELvhrQaKUMVdhFZlP/bCly8aPmrGJVa3JR5ydWD+k4hfQnOpbj3iqBi1ZlZ8sq2Rpdik5qxFfY8EtLRHCrv1UroYt7i/OjltpTf2YA/W5+X8FzwCK/CiMzaCgwTe3KDmpNwIaXjGNQ79GgUmB30YAJ7Y Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 13/03/26 03:35, Andrew Morton wrote: > On Thu, 12 Mar 2026 17:55:27 +0530 Sayali Patil wrote: > >> Hi all, >> >> Powerpc systems with a 64K base page size exposed several issues while >> running mm selftests. Some tests assume specific hugetlb configurations, >> use incorrect interfaces, or fail instead of skipping when the required >> kernel features are not available. >> >> This series fixes these issues and improves test robustness. > Thanks, I updated mm.git's mm-new branch to this version. > >> --- >> v1->v2 >> - For "selftests/mm: ensure destination is hugetlb-backed in hugepage-mremap": >> update FLAGS definition to MAP_HUGETLB | MAP_SHARED | MAP_POPULATE and >> used it for mmap() calls as suggested during review. > That was a really small change (below). It's better to wait a while > (half to one week) before resending an entire series. So as to > hopefully accumulate more changes. > > > > --- a/tools/testing/selftests/mm/hugepage-mremap.c~b > +++ a/tools/testing/selftests/mm/hugepage-mremap.c > @@ -31,7 +31,7 @@ > #define MB_TO_BYTES(x) (x * 1024 * 1024) > > #define PROTECTION (PROT_READ | PROT_WRITE | PROT_EXEC) > -#define FLAGS (MAP_SHARED | MAP_ANONYMOUS) > +#define FLAGS (MAP_HUGETLB | MAP_SHARED | MAP_POPULATE) > > static void check_bytes(char *addr) > { > @@ -121,23 +121,20 @@ int main(int argc, char *argv[]) > > /* mmap to a PUD aligned address to hopefully trigger pmd sharing. */ > unsigned long suggested_addr = 0x7eaa40000000; > - void *haddr = mmap((void *)suggested_addr, length, PROTECTION, > - MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0); > + void *haddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0); > ksft_print_msg("Map haddr: Returned address is %p\n", haddr); > if (haddr == MAP_FAILED) > ksft_exit_fail_msg("mmap1: %s\n", strerror(errno)); > > /* mmap again to a dummy address to hopefully trigger pmd sharing. */ > suggested_addr = 0x7daa40000000; > - void *daddr = mmap((void *)suggested_addr, length, PROTECTION, > - MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0); > + void *daddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0); > ksft_print_msg("Map daddr: Returned address is %p\n", daddr); > if (daddr == MAP_FAILED) > ksft_exit_fail_msg("mmap3: %s\n", strerror(errno)); > > suggested_addr = 0x7faa40000000; > - void *vaddr = mmap((void *)suggested_addr, length, PROTECTION, > - MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0); > + void *vaddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0); > ksft_print_msg("Map vaddr: Returned address is %p\n", vaddr); > if (vaddr == MAP_FAILED) > ksft_exit_fail_msg("mmap2: %s\n", strerror(errno)); > _ > > Thanks for the guidance. I'll make sure to follow this approach from next time.