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 AAC7E579829 for ; Wed, 23 Sep 2026 20:01:51 +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=1790193714; cv=none; b=TEdkbAqhaUOocQ5175+w7iQiechb4PzZiE4TfdaOdBr/fgkXo4V3orz9MhFRFsCi+QtclxsuP0A4PDxD3x4tlK+8Sz4Wrn7mwunUvFCH+GKHuYZ5n4IJkh43Y27jXjpZ7sD+anl3zH+ERMG0eBsPYi0oLDLaMakYARXNZaHOfeI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790193714; c=relaxed/simple; bh=s/Wm+4Ic0F3XQfNdZiFDjK0j5YXdLf50ESIiMHJQnM4=; h=Date:To:From:Subject:Message-Id; b=DBSjG0rvnVmk+XulBj8zLK2qw6kpd6YphoOmoXRvLWXo5oxNSAc5hcPir0BKNn0+insz5xCl+D+YvWRa+N5yb0o52i7WWsWj60DktRYLNf7st5KwABnFqWWpdQRt36Ro99adW7FFYPqiB3nU1rrTtKcAxgS6fl0IfMuYXH8OSEQ= 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=SNUqSm7/; 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="SNUqSm7/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AFAE81F00893; Wed, 23 Sep 2026 20:01:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1790193710; bh=5yMi70B342vexIo5t9NHN03xn7oFMcC2vED7k+cUiCM=; h=Date:To:From:Subject; b=SNUqSm7/s13l6KAZE5akF+4KLzvQRhs4AW8PQ0rxKB7hEp6/WIDKwC5zaUlCHemmf Ej3hIpfmYvCqao7RokDsxnSLNB/u4s6Djz2H7gx7BTfwYvXLl0oD3ZV2+Gh2mJQ8k5 TQALhZ+0M98jUipzAAsSD75hEBcPrAIrCeEMZ/AA= Date: Wed, 23 Sep 2026 13:01:50 -0700 To: mm-commits@vger.kernel.org,ljs@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-enable-mmu_gather_rcu_table_free-for-sparc64.patch added to mm-unstable branch Message-Id: <20260923200150.AFAE81F00893@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: enable MMU_GATHER_RCU_TABLE_FREE for sparc64 has been added to the -mm mm-unstable branch. Its filename is mm-enable-mmu_gather_rcu_table_free-for-sparc64.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-enable-mmu_gather_rcu_table_free-for-sparc64.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm 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: mm: enable MMU_GATHER_RCU_TABLE_FREE for sparc64 Date: Tue, 22 Sep 2026 16:35:37 +0100 Commit 4a0100f7546f ("sparc64: use RCU page table freeing") enabled CONFIG_MMU_GATHER_RCU_TABLE_FREE for SMP sparc64 architectures, expressly for GUP-fast page table walkers. Naturally, UP systems do not have to worry about concurrent GUP fast operations. However, CONFIG_PREEMPT_RCU is also available even on a UP system, so a future pure-RCU page table walker requires MMU_GATHER_RCU_TABLE_FREE to be enabled on UP, even if concurrent GUP fast is not possible there. To enable future pure-RCU page table walkers, enable MMU_GATHER_RCU_TABLE_FREE unconditionally. With this change, it is no longer necessary to have !CONFIG_SMP pgtable_free_tlb(), so also remove this now dead code. This forms part of an overall effort to switch every architecture to this mode. Link: https://lore.kernel.org/20260922-rcu-pagetable-freeing-v4-6-fe1ad1f1e303@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) Signed-off-by: Andrew Morton Acked-by: Kiryl Shutsemau (Meta) Tested-by: Lance Yang Acked-by: Lance Yang Cc: David Hildenbrand Cc: Zi Yan Cc: Baolin Wang Cc: Liam R. Howlett Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Usama Arif Cc: Guo Ren Cc: Brian Cain Cc: Geert Uytterhoeven Cc: Dinh Nguyen Cc: Simon Schuster Cc: Jonas Bonn Cc: Stefan Kristiansson Cc: Stafford Horne Cc: Rich Felker Cc: John Paul Adrian Glaubitz Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Alexandre Ghiti Cc: Russell King Cc: Vineet Gupta Cc: Michal Simek Cc: Chris Zankel Cc: Max Filippov Cc: Will Deacon Cc: Aneesh Kumar K.V Cc: Nicholas Piggin Cc: Peter Zijlstra Cc: David S. Miller Cc: Andreas Larsson Cc: Richard Henderson Cc: Matt Turner Cc: Magnus Lindholm Cc: Catalin Marinas Cc: Mark Rutland Cc: Huacai Chen Cc: WANG Xuerui Cc: Thomas Bogendoerfer Cc: James Bottomley Cc: Helge Deller Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Christophe Leroy Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Alexander Gordeev Cc: Christian Borntraeger Cc: Sven Schnelle Cc: Richard Weinberger Cc: Anton Ivanov Cc: Johannes Berg Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: H. Peter Anvin Cc: Arnd Bergmann Cc: Vlastimil Babka Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Jason Gunthorpe Cc: John Hubbard Cc: Peter Xu Cc: Yoshinori Sato Cc: Shakeel Butt Cc: Jonathan Corbet Cc: Randy Dunlap Cc: Hugh Dickins Cc: Qi Zheng --- arch/sparc/Kconfig | 4 ++-- arch/sparc/include/asm/pgalloc_64.h | 8 -------- 2 files changed, 2 insertions(+), 10 deletions(-) --- a/arch/sparc/include/asm/pgalloc_64.h~mm-enable-mmu_gather_rcu_table_free-for-sparc64 +++ a/arch/sparc/include/asm/pgalloc_64.h @@ -74,8 +74,6 @@ void pte_free_defer(struct mm_struct *mm void pgtable_free(void *table, bool is_page); -#ifdef CONFIG_SMP - struct mmu_gather; void tlb_remove_table(struct mmu_gather *, void *); @@ -96,12 +94,6 @@ static inline void __tlb_remove_table(vo is_page = true; pgtable_free(table, is_page); } -#else /* CONFIG_SMP */ -static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, bool is_page) -{ - pgtable_free(table, is_page); -} -#endif /* !CONFIG_SMP */ static inline void __pte_free_tlb(struct mmu_gather *tlb, pte_t *pte, unsigned long address) --- a/arch/sparc/Kconfig~mm-enable-mmu_gather_rcu_table_free-for-sparc64 +++ a/arch/sparc/Kconfig @@ -75,8 +75,8 @@ config SPARC64 select HAVE_FUNCTION_GRAPH_TRACER select HAVE_KRETPROBES select HAVE_KPROBES - select MMU_GATHER_RCU_TABLE_FREE if SMP - select HAVE_ARCH_TLB_REMOVE_TABLE if SMP + select MMU_GATHER_RCU_TABLE_FREE + select HAVE_ARCH_TLB_REMOVE_TABLE select MMU_GATHER_MERGE_VMAS select MMU_GATHER_NO_FLUSH_CACHE select HAVE_ARCH_TRANSPARENT_HUGEPAGE _ Patches currently in -mm which might be from ljs@kernel.org are mm-vma-predicate-setting-mmap_prepare-vma-fields-on-new-vma-alloc.patch mm-mremap-fix-locked_vm-leak-from-mremap_dontunmap-self-merge.patch mm-mremap-fix-locked_vm-leak-by-splitting-vma-for-mremap_dontunmap.patch 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-khugepaged-deposit-a-newly-allocated-page-table-on-collapse.patch mm-khugepaged-deposit-a-newly-allocated-page-table-on-collapse-fix.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-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 mm-vma-const-ify-vma_assert_stabilised-and-associated-functions.patch mm-implement-and-use-vma_has_anon_rmap-silence-kcsan.patch mm-update-comments-to-refer-to-anon-rmap-rather-than-anon_vma.patch