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 EB4953783AF for ; Wed, 16 Sep 2026 02:06:31 +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=1789524399; cv=none; b=X8Yyga/mgt/NunKLofvLlzQxoHR74YP8g5VRy7rqf0qUqT246g2K/L4IcjYjnH29gbn9IPOCF1QulQfL1BvTSKWNAgZNMOkleDr8mM4oDR1CL3ePOkrV/C7mfOy2hS8f01FufurkZUWJeweeqHEUZDx6drk1YEqoTa3cbQg99Jo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789524399; c=relaxed/simple; bh=D3tITkmX9PwhDrtl1zhQz1v+D49U6oz9258Jv4U7fNY=; h=Date:To:From:Subject:Message-Id; b=KAZ3vjcYNG9eAYr1c/tgPBZsyh60GTKMoG/0lZ/8bKi7yfk5PguXS+Zi8VU6dvFTBVSxRslZgl2ByjhydsTHxRppel2C+RU6AzgUMFqRIF9vgX7+0rQ3B9FZETgVU+PpSD4uhqDEp2hRtkkbW12Jwc0QKLDUILCcw2qsL0U+eX4= 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=Lz8ByRE1; 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="Lz8ByRE1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA7241F00899; Wed, 16 Sep 2026 02:06:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789524387; bh=W85OhsxthX08LnNK/lERMPPy9WPjRi8aFFEkByJAexQ=; h=Date:To:From:Subject; b=Lz8ByRE1ZQ26S0vjcuD906utXSDffFDpd9NHGADwNXrfwqF+IjLHk9/pgRtahttUT nR3LD8cA+4mdd7sz9h+BCrAwjve9cR66G2aN+qFKRjKjuZ2HdbKK0FRtX5JxH/Ml0c a8wVikx059c2F9GWCHH5tLqch+2lytYZ83jFEDAA= Date: Tue, 15 Sep 2026 19:06:27 -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-arc-microblaze-xtensa.patch added to mm-unstable branch Message-Id: <20260916020627.AA7241F00899@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 arc, microblaze, xtensa has been added to the -mm mm-unstable branch. Its filename is mm-enable-mmu_gather_rcu_table_free-for-arc-microblaze-xtensa.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-arc-microblaze-xtensa.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 arc, microblaze, xtensa Date: Fri, 11 Sep 2026 20:36:52 +0100 Each of these architectures directly free page tables without routing these changes through tlb_remove_ptdesc(). The use of tlb_remove_ptdesc() is required for CONFIG_MMU_GATHER_RCU_TABLE_FREE to correctly free page tables under RCU, so simply update these architectures to use these functions. Since none of the architectures share page tables or do anything unusual, nothing complicated is required here. Therefore this is simply a mechanical change - convert __pud_free_tlb(), __pmd_free_tlb() and __pte_free_tlb() to use tlb_remove_ptdesc() as required. At the point this is in place, all mmu_gather page table freeing is performed under RCU, and thus MMU_GATHER_RCU_TABLE_FREE is selected for each architecture. Note that CONFIG_MMU_GATHER_RCU_TABLE_FREE is dependent on CONFIG_MMU for xtensa to reflect the fact that nommu does not implement page table gathering. This forms part of an overall effort to switch every architecture to this mode. Link: https://lore.kernel.org/20260911-rcu-pagetable-freeing-v3-5-7b8c86103821@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) Signed-off-by: Andrew Morton Acked-by: Kiryl Shutsemau (Meta) Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Andreas Larsson Cc: "Aneesh Kumar K.V" Cc: Anton Ivanov Cc: Arnd Bergmann Cc: Baolin Wang Cc: Barry Song Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Christian Zankel Cc: Dave Hansen Cc: David Hildenbrand Cc: David S. Miller Cc: Dev Jain Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Hugh Dickins Cc: Ingo Molnar Cc: James Bottomley Cc: Jason Gunthorpe Cc: Johannes Berg Cc: John Hubbard Cc: John Paul Adrian Glaubitz Cc: Jonas Bonn Cc: Lance Yang Cc: Liam R. Howlett Cc: Madhavan Srinivasan Cc: Magnus Lindholm Cc: Marc Rutland Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Hocko Cc: Michal Simek Cc: Mike Rapoport Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Peter Xu Cc: Peter Zijlstra Cc: Richard Henderson Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Ryan Roberts Cc: Stafford Horne Cc: Stefan Kristiansson Cc: Suren Baghdasaryan Cc: Sven Schnelle Cc: Thomas Bogendoerfer Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Vlastimil Babka Cc: WANG Xuerui Cc: Will Deacon Cc: Yoshinori Sato Cc: Zi Yan --- arch/arc/Kconfig | 1 + arch/arc/include/asm/pgalloc.h | 6 +++--- arch/microblaze/Kconfig | 1 + arch/microblaze/include/asm/pgalloc.h | 2 +- arch/xtensa/Kconfig | 1 + arch/xtensa/include/asm/tlb.h | 2 +- 6 files changed, 8 insertions(+), 5 deletions(-) --- a/arch/arc/include/asm/pgalloc.h~mm-enable-mmu_gather_rcu_table_free-for-arc-microblaze-xtensa +++ a/arch/arc/include/asm/pgalloc.h @@ -72,7 +72,7 @@ static inline void p4d_populate(struct m set_p4d(p4dp, __p4d((unsigned long)pudp)); } -#define __pud_free_tlb(tlb, pmd, addr) pud_free((tlb)->mm, pmd) +#define __pud_free_tlb(tlb, pmd, addr) tlb_remove_ptdesc((tlb), virt_to_ptdesc(pmd)) #endif @@ -83,10 +83,10 @@ static inline void pud_populate(struct m set_pud(pudp, __pud((unsigned long)pmdp)); } -#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd) +#define __pmd_free_tlb(tlb, pmd, addr) tlb_remove_ptdesc((tlb), virt_to_ptdesc(pmd)) #endif -#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte) +#define __pte_free_tlb(tlb, pte, addr) tlb_remove_ptdesc((tlb), page_ptdesc(pte)) #endif /* _ASM_ARC_PGALLOC_H */ --- a/arch/arc/Kconfig~mm-enable-mmu_gather_rcu_table_free-for-arc-microblaze-xtensa +++ a/arch/arc/Kconfig @@ -47,6 +47,7 @@ config ARC select HAVE_SYSCALL_TRACEPOINTS select IRQ_DOMAIN select LOCK_MM_AND_FIND_VMA + select MMU_GATHER_RCU_TABLE_FREE select MODULES_USE_ELF_RELA select OF select OF_EARLY_FLATTREE --- a/arch/microblaze/include/asm/pgalloc.h~mm-enable-mmu_gather_rcu_table_free-for-arc-microblaze-xtensa +++ a/arch/microblaze/include/asm/pgalloc.h @@ -25,7 +25,7 @@ extern void __bad_pte(pmd_t *pmd); extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm); -#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, (pte)) +#define __pte_free_tlb(tlb, pte, addr) tlb_remove_ptdesc((tlb), page_ptdesc(pte)) #define pmd_populate(mm, pmd, pte) \ (pmd_val(*(pmd)) = (unsigned long)page_address(pte)) --- a/arch/microblaze/Kconfig~mm-enable-mmu_gather_rcu_table_free-for-arc-microblaze-xtensa +++ a/arch/microblaze/Kconfig @@ -41,6 +41,7 @@ config MICROBLAZE select PCI_SYSCALL if PCI select CPU_NO_EFFICIENT_FFS select MMU_GATHER_NO_RANGE + select MMU_GATHER_RCU_TABLE_FREE select SPARSE_IRQ select ZONE_DMA select TRACE_IRQFLAGS_SUPPORT --- a/arch/xtensa/include/asm/tlb.h~mm-enable-mmu_gather_rcu_table_free-for-arc-microblaze-xtensa +++ a/arch/xtensa/include/asm/tlb.h @@ -16,7 +16,7 @@ #include -#define __pte_free_tlb(tlb, pte, address) pte_free((tlb)->mm, pte) +#define __pte_free_tlb(tlb, pte, address) tlb_remove_ptdesc((tlb), page_ptdesc(pte)) void check_tlb_sanity(void); --- a/arch/xtensa/Kconfig~mm-enable-mmu_gather_rcu_table_free-for-arc-microblaze-xtensa +++ a/arch/xtensa/Kconfig @@ -55,6 +55,7 @@ config XTENSA select HAVE_VIRT_CPU_ACCOUNTING_GEN select IRQ_DOMAIN select LOCK_MM_AND_FIND_VMA + select MMU_GATHER_RCU_TABLE_FREE if MMU select MODULES_USE_ELF_RELA select PERF_USE_VMALLOC select TRACE_IRQFLAGS_SUPPORT _ 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