From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 EED5039DBCA for ; Tue, 10 Mar 2026 16:43:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773160995; cv=none; b=TaqefaALc0SOB1HvwFlKMakTrXl599YZB0chLcvWDpX5xwPtQPOn++BSaqIgc8VJccgNO0PwCxV0ksiRt8DZajIOCEbDas8E1TVRrTbmQSZxzP3X4L+IsX5iTRGuLW8WQMT0sWK3FpithhyvUDOaExnDrBjQE4keFlDJqwLMeYQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773160995; c=relaxed/simple; bh=ynWLXnEBu0WnAvz6inv41LLpQNdzn8m36W0LsAdmI+k=; h=Date:To:From:Subject:Message-Id; b=sfAmhR/h56hLwEojLtTEc8e+/ZuDfUM3okYmjR7jORHNumjXtx+kyud1DU1FyDTBk3LC15zjw9oz7wtx/vhWL2i9GJoTGzBh4aJ/kzysARdKJvY60fUKgrBEo5+LH69tKGfgrqbIWlaDCS8Ict7O5yZhL1SbRhsXD969rPCH5lw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=X+71wk6n; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="X+71wk6n" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 94451C19423; Tue, 10 Mar 2026 16:43:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1773160994; bh=ynWLXnEBu0WnAvz6inv41LLpQNdzn8m36W0LsAdmI+k=; h=Date:To:From:Subject:From; b=X+71wk6ndNHkeixP0KwhfRPM7GpVhhrCSq4xVO0PaC+DF5A2foFbeuGzkxKuUyoCw mLSa+ZI6JkddbupDPyRa3lTLKe4MZOuhkUn5dniXX43p+IGQ0DP6p2XiXZVatCmgPk 5WgfX1xvbJWbQwnx/J92wLHVt73tyXLzJdcOwmwM= Date: Tue, 10 Mar 2026 09:43:14 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,usama.anjum@collabora.com,tj@kernel.org,shuah@kernel.org,shakeel.butt@linux.dev,roman.gushchin@linux.dev,ritesh.list@gmail.com,osalvador@suse.de,muchun.song@linux.dev,mkoutny@suse.com,mhocko@kernel.org,lorenzo.stoakes@oracle.com,liam.howlett@oracle.com,hannes@cmpxchg.org,dev.jain@arm.com,david@kernel.org,sayalip@linux.ibm.com,akpm@linux-foundation.org From: Andrew Morton Subject: + selftests-mm-ensure-destination-is-hugetlb-backed-in-hugepage-mremap.patch added to mm-new branch Message-Id: <20260310164314.94451C19423@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: selftests/mm: ensure destination is hugetlb-backed in hugepage-mremap has been added to the -mm mm-new branch. Its filename is selftests-mm-ensure-destination-is-hugetlb-backed-in-hugepage-mremap.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-ensure-destination-is-hugetlb-backed-in-hugepage-mremap.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Sayali Patil Subject: selftests/mm: ensure destination is hugetlb-backed in hugepage-mremap Date: Tue, 10 Mar 2026 15:19:26 +0530 The hugepage-mremap selftest reserves the destination address using a anonymous base-page mapping before calling mremap() with MREMAP_FIXED, while the source region is hugetlb-backed. When remapping a hugetlb mapping into a base-page VMA may fail with: mremap: Device or resource busy This is observed on powerpc hash MMU systems where slice constraints and page size incompatibilities prevent the remap. Ensure the destination region is created using MAP_HUGETLB so that both source and destination VMAs are hugetlb-backed and compatible. Also add MAP_POPULATE to the destination mapping to prefault hugepages, matching the behaviour used for other hugetlb mappiing in the test and ensuring deterministic behaviour. This ensures the test reliably exercises hugetlb mremap instead of failing due to VMA type mismatch. Link: https://lkml.kernel.org/r/2c8858154273159f964236810c7304dec665b28b.1773134177.git.sayalip@linux.ibm.com Fixes: 12b613206474 ("mm, hugepages: add hugetlb vma mremap() test") Signed-off-by: Sayali Patil Cc: David Hildenbrand Cc: Dev Jain Cc: Johannes Weiner Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: "Michal Koutný" Cc: Muchun Song Cc: Muhammad Usama Anjum Cc: Oscar Salvador Cc: "Ritesh Harjani (IBM)" Cc: Roman Gushchin Cc: Shakeel Butt Cc: Shuah Khan Cc: Tejun Heo Cc: Zi Yan Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/hugepage-mremap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/tools/testing/selftests/mm/hugepage-mremap.c~selftests-mm-ensure-destination-is-hugetlb-backed-in-hugepage-mremap +++ a/tools/testing/selftests/mm/hugepage-mremap.c @@ -136,8 +136,8 @@ int main(int argc, char *argv[]) ksft_exit_fail_msg("mmap3: %s\n", strerror(errno)); suggested_addr = 0x7faa40000000; - void *vaddr = - mmap((void *)suggested_addr, length, PROTECTION, FLAGS, -1, 0); + void *vaddr = mmap((void *)suggested_addr, length, PROTECTION, + MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, 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)); _ Patches currently in -mm which might be from sayalip@linux.ibm.com are selftests-mm-restore-default-nr_hugepages-value-during-cleanup-in-charge_reserved_hugetlbsh.patch selftests-mm-fix-hugetlb-pathname-construction-in-charge_reserved_hugetlbsh.patch selftests-mm-fix-hugetlb-pathname-construction-in-hugetlb_reparenting_testsh.patch selftest-mm-fix-cgroup-task-placement-and-tolerance-in-hugetlb_reparenting_testsh.patch selftests-mm-size-tmpfs-according-to-pmd-page-size-in-split_huge_page_test.patch selftest-mm-adjust-hugepage-mremap-test-size-for-large-huge-pages.patch selftest-mm-register-existing-mapping-with-userfaultfd-in-hugepage-mremap.patch selftests-mm-ensure-destination-is-hugetlb-backed-in-hugepage-mremap.patch selftests-mm-skip-uffd-wp-mremap-if-uffd-write-protect-is-unsupported.patch selftests-mm-skip-uffd-stress-test-when-nr_pages_per_cpu-is-zero.patch selftests-mm-fix-double-increment-in-linked-list-cleanup-in-compaction_test.patch selftests-mm-move-hwpoison-setup-into-run_test-and-silence-modprobe-output-for-memory-failure-category.patch selftests-cgroup-extend-test_hugetlb_memcgc-to-support-all-huge-page-sizes.patch