From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6CA1BC7EE25 for ; Fri, 9 Jun 2023 20:11:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229965AbjFIULW (ORCPT ); Fri, 9 Jun 2023 16:11:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230391AbjFIULL (ORCPT ); Fri, 9 Jun 2023 16:11:11 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB0D11B9 for ; Fri, 9 Jun 2023 13:11:08 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6D35665B8E for ; Fri, 9 Jun 2023 20:11:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE0F2C433EF; Fri, 9 Jun 2023 20:11:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1686341467; bh=u+ATgrsMLE33gEya9/DUPgRVvCmgEQn1htI6AeLSkg0=; h=Date:To:From:Subject:From; b=OEyLqpOfkWByp4n5/T3O6YpmGUiiyxOL8UG9zsGlcAxmt6lS3Dcm78+b978e8WFGS OuXYzX1Ud3WEAxQo5b9zLPIRiS02jqhhZMaKXNkJRYq+8Qpz13p3CmjW2PAtHjG1r+ apDLudzw7LeqmU1r627gnfKY5esP2wM5f30ONsYo= Date: Fri, 09 Jun 2023 13:11:07 -0700 To: mm-commits@vger.kernel.org, zhengqi.arch@bytedance.com, zackr@vmware.com, yuzhao@google.com, ying.huang@intel.com, willy@infradead.org, will@kernel.org, thomas.hellstrom@linux.intel.com, surenb@google.com, steven.price@arm.com, song@kernel.org, sj@kernel.org, shy828301@gmail.com, ryan.roberts@arm.com, rppt@kernel.org, rcampbell@nvidia.com, peterz@infradead.org, peterx@redhat.com, pasha.tatashin@soleen.com, naoya.horiguchi@nec.com, minchan@kernel.org, mike.kravetz@oracle.com, mgorman@techsingularity.net, lstoakes@gmail.com, linmiaohe@huawei.com, kirill.shutemov@linux.intel.com, jgg@ziepe.ca, ira.weiny@intel.com, hch@infradead.org, david@redhat.com, christophe.leroy@csgroup.eu, axelrasmussen@google.com, apopple@nvidia.com, anshuman.khandual@arm.com, hughd@google.com, akpm@linux-foundation.org From: Andrew Morton Subject: + mm-vmwgfx-simplify-pmd-pud-mapping-dirty-helpers.patch added to mm-unstable branch Message-Id: <20230609201107.BE0F2C433EF@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm/vmwgfx: simplify pmd & pud mapping dirty helpers has been added to the -mm mm-unstable branch. Its filename is mm-vmwgfx-simplify-pmd-pud-mapping-dirty-helpers.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmwgfx-simplify-pmd-pud-mapping-dirty-helpers.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 the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Hugh Dickins Subject: mm/vmwgfx: simplify pmd & pud mapping dirty helpers Date: Thu, 8 Jun 2023 18:20:04 -0700 (PDT) wp_clean_pmd_entry() need not check pmd_trans_unstable() or pmd_none(), wp_clean_pud_entry() need not check pud_trans_unstable() or pud_none(): it's just the ACTION_CONTINUE when trans_huge or devmap that's needed to prevent splitting, and we're hoping to remove pmd_trans_unstable(). Is that PUD #ifdef necessary? Maybe some configs are missing a stub. Link: https://lkml.kernel.org/r/d3379c7-65db-26d3-1764-8e866490925f@google.com Signed-off-by: Hugh Dickins Cc: Alistair Popple Cc: Anshuman Khandual Cc: Axel Rasmussen Cc: Christophe Leroy Cc: Christoph Hellwig Cc: David Hildenbrand Cc: "Huang, Ying" Cc: Ira Weiny Cc: Jason Gunthorpe Cc: Kirill A. Shutemov Cc: Lorenzo Stoakes Cc: Matthew Wilcox Cc: Mel Gorman Cc: Miaohe Lin Cc: Mike Kravetz Cc: Mike Rapoport (IBM) Cc: Minchan Kim Cc: Naoya Horiguchi Cc: Pavel Tatashin Cc: Peter Xu Cc: Peter Zijlstra Cc: Qi Zheng Cc: Ralph Campbell Cc: Ryan Roberts Cc: SeongJae Park Cc: Song Liu Cc: Steven Price Cc: Suren Baghdasaryan Cc: Thomas Hellström Cc: Will Deacon Cc: Yang Shi Cc: Yu Zhao Cc: Zack Rusin Signed-off-by: Andrew Morton --- mm/mapping_dirty_helpers.c | 34 +++++++++------------------------- 1 file changed, 9 insertions(+), 25 deletions(-) --- a/mm/mapping_dirty_helpers.c~mm-vmwgfx-simplify-pmd-pud-mapping-dirty-helpers +++ a/mm/mapping_dirty_helpers.c @@ -128,19 +128,11 @@ static int wp_clean_pmd_entry(pmd_t *pmd { pmd_t pmdval = pmdp_get_lockless(pmd); - if (!pmd_trans_unstable(&pmdval)) - return 0; - - if (pmd_none(pmdval)) { - walk->action = ACTION_AGAIN; - return 0; - } - - /* Huge pmd, present or migrated */ - walk->action = ACTION_CONTINUE; - if (pmd_trans_huge(pmdval) || pmd_devmap(pmdval)) + /* Do not split a huge pmd, present or migrated */ + if (pmd_trans_huge(pmdval) || pmd_devmap(pmdval)) { WARN_ON(pmd_write(pmdval) || pmd_dirty(pmdval)); - + walk->action = ACTION_CONTINUE; + } return 0; } @@ -156,23 +148,15 @@ static int wp_clean_pmd_entry(pmd_t *pmd static int wp_clean_pud_entry(pud_t *pud, unsigned long addr, unsigned long end, struct mm_walk *walk) { +#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD pud_t pudval = READ_ONCE(*pud); - if (!pud_trans_unstable(&pudval)) - return 0; - - if (pud_none(pudval)) { - walk->action = ACTION_AGAIN; - return 0; - } - -#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD - /* Huge pud */ - walk->action = ACTION_CONTINUE; - if (pud_trans_huge(pudval) || pud_devmap(pudval)) + /* Do not split a huge pud */ + if (pud_trans_huge(pudval) || pud_devmap(pudval)) { WARN_ON(pud_write(pudval) || pud_dirty(pudval)); + walk->action = ACTION_CONTINUE; + } #endif - return 0; } _ Patches currently in -mm which might be from hughd@google.com are arm-allow-pte_offset_map-to-fail.patch arm64-allow-pte_offset_map-to-fail.patch arm64-hugetlb-pte_alloc_huge-pte_offset_huge.patch ia64-hugetlb-pte_alloc_huge-pte_offset_huge.patch m68k-allow-pte_offset_map-to-fail.patch microblaze-allow-pte_offset_map-to-fail.patch mips-update_mmu_cache-can-replace-__update_tlb.patch mips-update_mmu_cache-can-replace-__update_tlb-fix.patch parisc-add-pte_unmap-to-balance-get_ptep.patch parisc-unmap_uncached_pte-use-pte_offset_kernel.patch parisc-hugetlb-pte_alloc_huge-pte_offset_huge.patch powerpc-kvmppc_unmap_free_pmd-pte_offset_kernel.patch powerpc-allow-pte_offset_map-to-fail.patch powerpc-hugetlb-pte_alloc_huge.patch riscv-hugetlb-pte_alloc_huge-pte_offset_huge.patch s390-allow-pte_offset_map_lock-to-fail.patch s390-gmap-use-pte_unmap_unlock-not-spin_unlock.patch sh-hugetlb-pte_alloc_huge-pte_offset_huge.patch sparc-hugetlb-pte_alloc_huge-pte_offset_huge.patch sparc-allow-pte_offset_map-to-fail.patch sparc-iounit-and-iommu-use-pte_offset_kernel.patch x86-allow-get_locked_pte-to-fail.patch x86-sme_populate_pgd-use-pte_offset_kernel.patch xtensa-add-pte_unmap-to-balance-pte_offset_map.patch mm-use-pmdp_get_lockless-without-surplus-barrier.patch mm-migrate-remove-cruft-from-migration_entry_waits.patch mm-pgtable-kmap_local_page-instead-of-kmap_atomic.patch mm-pgtable-allow-pte_offset_map-to-fail.patch mm-filemap-allow-pte_offset_map_lock-to-fail.patch mm-page_vma_mapped-delete-bogosity-in-page_vma_mapped_walk.patch mm-page_vma_mapped-reformat-map_pte-with-less-indentation.patch mm-page_vma_mapped-pte_offset_map_nolock-not-pte_lockptr.patch mm-pagewalkers-action_again-if-pte_offset_map_lock-fails.patch mm-pagewalk-walk_pte_range-allow-for-pte_offset_map.patch mm-vmwgfx-simplify-pmd-pud-mapping-dirty-helpers.patch mm-vmalloc-vmalloc_to_page-use-pte_offset_kernel.patch mm-hmm-retry-if-pte_offset_map-fails.patch mm-userfaultfd-retry-if-pte_offset_map-fails.patch mm-userfaultfd-allow-pte_offset_map_lock-to-fail.patch mm-debug_vm_pgtablepage_table_check-warn-pte-map-fails.patch mm-various-give-up-if-pte_offset_map-fails.patch mm-mprotect-delete-pmd_none_or_clear_bad_unless_trans_huge.patch mm-mremap-retry-if-either-pte_offset_map_lock-fails.patch mm-madvise-clean-up-pte_offset_map_lock-scans.patch mm-madvise-clean-up-force_shm_swapin_readahead.patch mm-swapoff-allow-pte_offset_map-to-fail.patch mm-mglru-allow-pte_offset_map_nolock-to-fail.patch mm-migrate_device-allow-pte_offset_map_lock-to-fail.patch mm-gup-remove-foll_split_pmd-use-of-pmd_trans_unstable.patch mm-huge_memory-split-huge-pmd-under-one-pte_offset_map.patch mm-khugepaged-allow-pte_offset_map-to-fail.patch mm-memory-allow-pte_offset_map-to-fail.patch mm-memory-handle_pte_fault-use-pte_offset_map_nolock.patch mm-pgtable-delete-pmd_trans_unstable-and-friends.patch mm-swap-swap_vma_readahead-do-the-pte_offset_map.patch perf-core-allow-pte_offset_map-to-fail.patch