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 2D91D3290C9 for ; Tue, 15 Sep 2026 01:09:00 +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=1789434542; cv=none; b=YkJRg/WoH+MdoH2NDbcee1p332hqsql4opcNSDBoklLs17PIIi1nbV2lhrURZs+lLLpDzkBO3IihEpDB8ZgurYw+udeomrgfNR+EAZOg53VgUKqV63i+FQB7HS6NuOkIdEmzksZdrZb86tMOp8MfMHVfga/rtUjJ04hiHORts4M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789434542; c=relaxed/simple; bh=FwHWp0x8SIXvOaXKbGyWdONzKMIBqyNTTGQuxhMmI/Y=; h=Date:To:From:Subject:Message-Id; b=KxtM/HlSDrb8iTwNSndoQCnADVs2cfIcEy7HrsW5EoqJvmkz+VNkltRowz/V+qGtcG1P/aZSIXLIR2xXadSClNquh/G1edidVKP+fibr/6Ua0N2ZlB+ATFsoZt1mLeS3tC28xP78ycgU0NcZWELHPjr+M7dQsXe4Rurar+nLuDg= 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=IXRHvTqb; 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="IXRHvTqb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC7E91F000FF; Tue, 15 Sep 2026 01:09:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789434540; bh=eJuFLy2nIhScuSN6j00V4mh9EAw94YElC7NIXW329f0=; h=Date:To:From:Subject; b=IXRHvTqb56W3UIDx1OVCBD/sChZqIZfwazjaEjo3WOebTfpAfesEYc4CQsuA1hyfb Jw/3pCxp4JbSa9AVdz+6K9nhAZbzTdCgB86m1r3J12QeR16p0Ghj1QTvcP2huIIppr LIKQojr+Yntg1RZ9nup6cs0hqUcvW3+3H1RUZlDE= Date: Mon, 14 Sep 2026 18:09:00 -0700 To: mm-commits@vger.kernel.org,ljs@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + bpf-arena-mark-arena_map_mmap-mappings-vm_mixedmap.patch added to mm-new branch Message-Id: <20260915010900.BC7E91F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: bpf: arena: mark arena_map_mmap() mappings VM_MIXEDMAP has been added to the -mm mm-new branch. Its filename is bpf-arena-mark-arena_map_mmap-mappings-vm_mixedmap.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/bpf-arena-mark-arena_map_mmap-mappings-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: bpf: arena: mark arena_map_mmap() mappings VM_MIXEDMAP Date: Mon, 14 Sep 2026 15:57:34 +0100 The bpf_map->ops->map_mmap callback invoked by bpf_map_mmap() can be set to one of ringbuf_map_mmap_kern(), ringbuf_map_mmap_user(), array_map_mmap() or arena_map_mmap(). It is convention in mm to mark mappings whose pages the kernel manages itself with VM_MIXEDMAP, so the core mm knows not to treat them as ordinary page cache or anonymous memory. The map_mmap callbacks ringbuf_map_mmap_kern() and ringbuf_map_mmap_user() use remap_vmalloc_range(), which ultimately invokes vm_insert_page() and so marks the ranges VM_MIXEDMAP, and array_map_mmap() sets VM_MIXEDMAP explicitly. However, the exception to this is arena_map_mmap(), which doesn't set the flag. This patch corrects this and updates the comment to reflect it. The pages are refcounted and vm_normal_page() finds them regardless of the flag, and VM_DONTEXPAND remains set (marking the memory as VM_SPECIAL and thus unmergeable). The one effect is that NUMA balancing now skips these VMAs, as it already does for the other bpf map mappings, which is the reason array_map_mmap() gives for setting the flag. The intent of this patch is to be able to establish the invariant that only PFN-mapped or mixed map ranges may clear the VM_MAYWRITE flag, as is done in bpf_map_mmap(). Link: https://lore.kernel.org/20260914-b4-mmap-prepare-vma-flag-sanify-v2-14-7d9781ed5361@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) Signed-off-by: Andrew Morton --- kernel/bpf/arena.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/kernel/bpf/arena.c~bpf-arena-mark-arena_map_mmap-mappings-vm_mixedmap +++ a/kernel/bpf/arena.c @@ -620,8 +620,9 @@ static int arena_map_mmap(struct bpf_map * clears VM_MAYEXEC. Set VM_DONTEXPAND to avoid potential change * of user_vm_start. Set VM_DONTCOPY to prevent arena VMA from * being copied into the child process on fork. + * This is a kernel page so set VM_MIXEDMAP. */ - vm_flags_set(vma, VM_DONTEXPAND | VM_DONTCOPY); + vm_flags_set(vma, VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTCOPY); vma->vm_ops = &arena_vm_ops; 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