From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 B2BDD34CDD for ; Mon, 1 Sep 2025 18:42:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756752167; cv=none; b=KJSeb7u9wGznYm0Gb8AMYsD2LDbkpODzkWu9F24CjLq2OPHtU1Z8ttZTPMDaCfrdLU35DqUyu+uNOP/GI4uyb2AoRF7v3NSx6/naXWmshLqhBzWja0/XrcRX5Ypkfsa58MU1rgHk0ql/pCFtiiPwczTlYpBNdD5geRGORtyQjN8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756752167; c=relaxed/simple; bh=GesqiZ7bcWr5kmR6Nkj/NmiMHLzoEww3qjeNS3fS3dU=; h=Date:To:From:Subject:Message-Id; b=ehyZmilz460Y9h8mHlEn+xdXv0PQ2Y8wWjPui5JNCN9SQpY/4o+y/gCre7PA03Msecyby2MV2cAL4YT7KLNrRojBmGX/cDS+iZwW60M5w1e4TAe/zfjPc8oGIuY7PUlDb0e2ni1cSFDlBvzi1RJYUKAv8mm30rKaQw67q+wQQLI= 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=MWino19P; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="MWino19P" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7EEBDC4CEF0; Mon, 1 Sep 2025 18:42:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1756752167; bh=GesqiZ7bcWr5kmR6Nkj/NmiMHLzoEww3qjeNS3fS3dU=; h=Date:To:From:Subject:From; b=MWino19PLJB1SoOKYtT9wKWghR3Nz1XGKUcr6sbPUXwq78U781AEPMeApEOp5XqdG SeJG53CTQUw2wHXqVUIQ0h+3kMCFRwBfJzm6a62GJk7AGd/yqerq94/8W/J51nLZuD z6DV87T/kG5x8dG1Bw/6ObB6W//xy5PrYD4iGuRQ= Date: Mon, 01 Sep 2025 11:42:47 -0700 To: mm-commits@vger.kernel.org,lorenzo.stoakes@oracle.com,axboe@kernel.dk,asml.silence@gmail.com,david@redhat.com,akpm@linux-foundation.org From: Andrew Morton Subject: + io_uring-zcrx-remove-nth_page-usage-within-folio.patch added to mm-new branch Message-Id: <20250901184247.7EEBDC4CEF0@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: io_uring/zcrx: remove nth_page() usage within folio has been added to the -mm mm-new branch. Its filename is io_uring-zcrx-remove-nth_page-usage-within-folio.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/io_uring-zcrx-remove-nth_page-usage-within-folio.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. 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: David Hildenbrand Subject: io_uring/zcrx: remove nth_page() usage within folio Date: Mon, 1 Sep 2025 17:03:41 +0200 Within a folio/compound page, nth_page() is no longer required. Given that we call folio_test_partial_kmap()+kmap_local_page(), the code would already be problematic if the pages would span multiple folios. So let's just assume that all src pages belong to a single folio/compound page and can be iterated ordinarily. The dst page is currently always a single page, so we're not actually iterating anything. Link: https://lkml.kernel.org/r/20250901150359.867252-21-david@redhat.com Signed-off-by: David Hildenbrand Reviewed-by: Pavel Begunkov Reviewed-by: Lorenzo Stoakes Cc: Jens Axboe Cc: Pavel Begunkov Signed-off-by: Andrew Morton --- io_uring/zcrx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/io_uring/zcrx.c~io_uring-zcrx-remove-nth_page-usage-within-folio +++ a/io_uring/zcrx.c @@ -975,9 +975,9 @@ static ssize_t io_copy_page(struct io_co if (folio_test_partial_kmap(page_folio(dst_page)) || folio_test_partial_kmap(page_folio(src_page))) { - dst_page = nth_page(dst_page, dst_offset / PAGE_SIZE); + dst_page += dst_offset / PAGE_SIZE; dst_offset = offset_in_page(dst_offset); - src_page = nth_page(src_page, src_offset / PAGE_SIZE); + src_page += src_offset / PAGE_SIZE; src_offset = offset_in_page(src_offset); n = min(PAGE_SIZE - src_offset, PAGE_SIZE - dst_offset); n = min(n, len); _ Patches currently in -mm which might be from david@redhat.com are mm-migrate-remove-migratepage_unmap.patch mm-migrate-remove-migratepage_unmap-fix.patch treewide-remove-migratepage_success.patch mm-huge_memory-move-more-common-code-into-insert_pmd.patch mm-huge_memory-move-more-common-code-into-insert_pud.patch mm-huge_memory-support-huge-zero-folio-in-vmf_insert_folio_pmd.patch fs-dax-use-vmf_insert_folio_pmd-to-insert-the-huge-zero-folio.patch mm-huge_memory-mark-pmd-mappings-of-the-huge-zero-folio-special.patch powerpc-ptdump-rename-struct-pgtable_level-to-struct-ptdump_pglevel.patch mm-rmap-convert-enum-rmap_level-to-enum-pgtable_level.patch mm-memory-convert-print_bad_pte-to-print_bad_page_map.patch mm-memory-convert-print_bad_pte-to-print_bad_page_map-fix.patch mm-memory-factor-out-common-code-from-vm_normal_page_.patch mm-introduce-and-use-vm_normal_page_pud.patch mm-rename-vm_ops-find_special_page-to-vm_ops-find_normal_page.patch prctl-extend-pr_set_thp_disable-to-optionally-exclude-vm_hugepage.patch mm-huge_memory-convert-tva_flags-to-enum-tva_type.patch mm-huge_memory-respect-madv_collapse-with-pr_thp_disable_except_advised.patch mm-stop-making-sparsemem_vmemmap-user-selectable.patch arm64-kconfig-drop-superfluous-select-sparsemem_vmemmap.patch s390-kconfig-drop-superfluous-select-sparsemem_vmemmap.patch x86-kconfig-drop-superfluous-select-sparsemem_vmemmap.patch wireguard-selftests-remove-config_sparsemem_vmemmap=y-from-qemu-kernel-config.patch mm-page_alloc-reject-unreasonable-folio-compound-page-sizes-in-alloc_contig_range_noprof.patch mm-memremap-reject-unreasonable-folio-compound-page-sizes-in-memremap_pages.patch mm-hugetlb-check-for-unreasonable-folio-sizes-when-registering-hstate.patch mm-mm_init-make-memmap_init_compound-look-more-like-prep_compound_page.patch mm-sanity-check-maximum-folio-size-in-folio_set_order.patch mm-limit-folio-compound-page-sizes-in-problematic-kernel-configs.patch mm-simplify-folio_page-and-folio_page_idx.patch mm-hugetlb-cleanup-hugetlb_folio_init_tail_vmemmap.patch mm-mm-percpu-km-drop-nth_page-usage-within-single-allocation.patch fs-hugetlbfs-remove-nth_page-usage-within-folio-in-adjust_range_hwpoison.patch fs-hugetlbfs-cleanup-folio-in-adjust_range_hwpoison.patch mm-pagewalk-drop-nth_page-usage-within-folio-in-folio_walk_start.patch mm-gup-drop-nth_page-usage-within-folio-when-recording-subpages.patch mm-gup-remove-record_subpages.patch io_uring-zcrx-remove-nth_page-usage-within-folio.patch mips-mm-convert-__flush_dcache_pages-to-__flush_dcache_folio_pages.patch mm-cma-refuse-handing-out-non-contiguous-page-ranges.patch dma-remap-drop-nth_page-in-dma_common_contiguous_remap.patch scatterlist-disallow-non-contigous-page-ranges-in-a-single-sg-entry.patch ata-libata-sff-drop-nth_page-usage-within-sg-entry.patch drm-i915-gem-drop-nth_page-usage-within-sg-entry.patch mspro_block-drop-nth_page-usage-within-sg-entry.patch memstick-drop-nth_page-usage-within-sg-entry.patch mmc-drop-nth_page-usage-within-sg-entry.patch scsi-scsi_lib-drop-nth_page-usage-within-sg-entry.patch scsi-sg-drop-nth_page-usage-within-sg-entry.patch vfio-pci-drop-nth_page-usage-within-sg-entry.patch crypto-remove-nth_page-usage-within-sg-entry.patch mm-gup-drop-nth_page-usage-in-unpin_user_page_range_dirty_lock.patch kfence-drop-nth_page-usage.patch block-update-comment-of-struct-bio_vec-regarding-nth_page.patch mm-remove-nth_page.patch