From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 137E2327C09 for ; Tue, 15 Sep 2026 01:10:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789434622; cv=none; b=HNIOw6iQk4suFvdmTq3Qu4/lhRrR0yLRX7cewg4WW38ONSGkbaYD3N3GqR+k7gbf25gqID0Eqhcnr7Q28d6Q6c9bXBv8cwc1CPhsiKc4Je+/hbX4Tz/Py/TNaD+TxEH08SCMlkZiC87MDff4GObrXKONe4zQWyedSDxif1NPJGE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789434622; c=relaxed/simple; bh=W+Ia3Zp1XtWWXp0xnYlX4imxSkXej95L52rI/N8gddg=; h=Date:To:From:Subject:Message-Id; b=msiwog96lZX/T8s9UMbbtfRzrWC37vFa0K9e/bSDDjp/FnZqn4QxfIS5xfvfHGQdnMeMkUHgI7YfIGwTrW0zRGw4wP/DdhBx5EBvGcgqbtON+wvVCo9AQxJVC2iSmLr1Rvy77U88kE1LvbnTiNj/ywNjsr0/OrSkFy8I+h30dRs= 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=17vDhluS; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="17vDhluS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D63BA1F00898; Tue, 15 Sep 2026 01:10:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789434618; bh=DEOffBQRzkcOlp3wV2z6fx9HqfbuGTgSJGiKqMUMq6s=; h=Date:To:From:Subject; b=17vDhluSrmKFvUFrbiRTnmUX0/dFULyDD7DpOEzD8za/VEQszRh+Pdaf6bX7k1CYv nEz9mHYgaKkfwpXMiPHY/Z/+bPiZtYnk6MgPtDQEkOqxckXxQ0HEwhuU09EvQEGt2v vf/tZGWWWN1/2Ros8vUT7yKwC9UoGhUrtKuAE104= Date: Mon, 14 Sep 2026 18:10:18 -0700 To: mm-commits@vger.kernel.org,ljs@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + fuse-dax-do-not-set-vm_mixedmap.patch added to mm-new branch Message-Id: <20260915011018.D63BA1F00898@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: fuse: dax: do not set VM_MIXEDMAP has been added to the -mm mm-new branch. Its filename is fuse-dax-do-not-set-vm_mixedmap.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fuse-dax-do-not-set-vm_mixedmap.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: "Lorenzo Stoakes (ARM)" Subject: fuse: dax: do not set VM_MIXEDMAP Date: Mon, 14 Sep 2026 15:57:58 +0100 Commit e1fb4a086495 ("dax: remove VM_MIXEDMAP for fsdax and device dax") prevented fsdax and device-dax from setting VM_MIXEDMAP, as DAX no longer relies on it to direct core mm paths. The fuse DAX implementation, added later, copied the old pattern and still sets it. Fuse DAX maps pages the same way fsdax does, via dax_iomap_fault() and ultimately vmf_insert_page_mkwrite() and vmf_insert_folio_pmd(), which insert ordinary refcounted pages and so do not require VM_MIXEDMAP. Setting it only serves to mark the mapping as kernel-owned, making fuse DAX the sole DAX implementation whose mappings are unmergeable, cannot be mlock()'d, eagerly copy page tables on fork and reject MADV_DOFORK and MADV_DODUMP. It also requires vma_is_special_huge() in mm/huge_memory.c to carve DAX out of its kernel-owned check explicitly. There is no reason for fuse DAX to keep on using this flag so drop it. Link: https://lore.kernel.org/20260914-b4-mmap-prepare-vma-flag-sanify-v2-38-7d9781ed5361@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) Signed-off-by: Andrew Morton --- fs/fuse/dax.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/fuse/dax.c~fuse-dax-do-not-set-vm_mixedmap +++ a/fs/fuse/dax.c @@ -826,7 +826,7 @@ int fuse_dax_mmap(struct file *file, str { file_accessed(file); vma->vm_ops = &fuse_dax_vm_ops; - vm_flags_set(vma, VM_MIXEDMAP | VM_HUGEPAGE); + vma_set_flags(vma, VMA_HUGEPAGE_BIT); return 0; } _ Patches currently in -mm which might be from ljs@kernel.org are mm-vmpressure-remove-window-size-todo.patch tools-testing-selftests-mm-add-missing-gitignore-entries.patch mm-move-drivers-char-memc-to-mm-char-memc.patch mm-implement-file_is_dev_zero-to-uniquely-identify-dev-zero.patch mm-vma-only-permit-map_private-dev-zero-to-be-mapped-anonymous.patch mm-vma-make-map_private-mapped-dev-zero-mappings-truly-anonymous.patch tools-testing-vma-add-test-to-assert-map_private-dev-zero-is-anon.patch tools-testing-selftests-mm-add-map_private-dev-zero-merge-tests.patch mm-madvise-swap-in-cowd-map_private-file-mappings-on-madv_willneed.patch mm-huge_memory-zap-deposited-page-tables-after-an-rcu-grace-period.patch mm-enable-mmu_gather_rcu_table_free-for-most-2-level-architectures.patch mm-enable-mmu_gather_rcu_table_free-for-mmu-riscv.patch mm-enable-mmu_gather_rcu_table_free-for-mmu-arm.patch mm-enable-mmu_gather_rcu_table_free-for-arc-microblaze-xtensa.patch mm-enable-mmu_gather_rcu_table_free-for-sparc64.patch mm-enable-mmu_gather_rcu_table_free-for-m68k-coldfire.patch mm-enable-mmu_gather_rcu_table_free-for-sh-x2.patch mm-enable-mmu_gather_rcu_table_free-for-m68k-motorola.patch mm-enable-mmu_gather_rcu_table_free-for-sparc32.patch mm-make-userland-page-table-freeing-rcu-safe.patch mm-change-the-contract-for-free_pgtables-update-docs.patch mm-vma-fix-mmap_prepare-file-handling-remove-file_doesnt_need_get.patch mm-vma-predicate-setting-mmap_prepare-vma-fields-on-new-vma-alloc.patch mm-vma-introduce-and-use-vma_can_merge.patch mm-consistently-validate-vma-state-after-mmap-hooks.patch mm-vma-ensure-mmap_prepare-doesnt-set-actions-on-a-mergeable-vma.patch mm-make-map_kernel_pages_-internal-and-unexported.patch mm-vma-tidy-up-map-kernel-pages-enum-values.patch mm-add-mmap-action-for-discontiguous-kernel-page-mapping.patch docs-filesystems-update-mmap_prepare-docs-for-discontig-kernel-pgs.patch drivers-usb-mon-update-to-use-mmap_prepare-map-kernel-pages.patch infiniband-update-hfi1-to-use-remap_vmalloc_range.patch selinux-reject-writable-opens-of-policy-file-drop-mmap-shared-write-check.patch alsa-pcm-use-vm_insert_page-to-map-pcm-status-page.patch bpf-arena-mark-arena_map_mmap-mappings-vm_mixedmap.patch mm-vma-add-vma_is_kernel_owned-predicates.patch mm-vma-only-allow-mmap-to-clear-vma_maywrite_bit-if-kernel-owned.patch mm-vma-add-and-use-vma__is_fixed_mapping.patch scsi-sg-convert-mmap-hook-to-mmap_prepare-and-rework.patch fbdev-defio-assert-fbinfo_virtfb-drop-vm_io-add-vm_mixedmap.patch hsi-cmt_speech-convert-mmap-hook-to-mmap_prepare-refactor.patch mm-gup-error-out-early-on-vma_mayread_bit-vmas.patch uprobes-remove-vm_io-set-vm_mixedmap-for-mapped-kernel-pages.patch mm-mlock-clear-vma_locked_mask-over-mmap-callback.patch mm-mlock-eliminate-weird-vma_io_bit-abuse-and-simplify.patch mm-vma-enforce-that-only-kernel-owned-mappings-may-set-vma_io_bit.patch mm-remove-vma_io_bit-check-in-vma_is_kernel_owned.patch mm-remove-hugetlb_inlineh.patch mm-rename-is_vm_hugetlb_page-to-vma_is_hugetlb.patch mm-drop-some-redundant-checks-around-hugetlb-vmas.patch mm-madvise-update-is_valid_guard_vma-to-use-vma_can_merge.patch mm-vma-introduce-vma_is_persistent.patch mm-uffd-use-predicates-for-userfaultfd-checks.patch mm-madvise-use-predicates-for-madvise-madv_dofork.patch mm-eliminate-vma_special_flags-usage-when-hugetlb-explicitly-tested.patch mm-eliminate-vma_special_flags-check-in-lru_gen_look_around.patch mm-avoid-use-of-vma_special_flags-in-migrate_vma_setup.patch mm-eliminate-vm_special-vma_special_flags.patch fuse-dax-do-not-set-vm_mixedmap.patch mm-huge_memory-remove-vma_is_special_huge.patch mm-vma-introduce-and-use-vma_can_gup.patch