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 381A23D7A18 for ; Thu, 17 Sep 2026 04:42:32 +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=1789620154; cv=none; b=eInkjE8HFRl6fWrWBv4KGtwXpziW82Vq3CD4AK6gLFfZWxOH0rEvPu3/4FAIZB3y3r2wBZrEa1lG2fO4xk2fYZeCOso5AiLg8eeGhN7ymexDalTGSYg+pJFZdczTIuQ7z1+CW2o7M6M/Tj66XaHgOs2HnoJ07TsxpzjhL0Z+6IE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789620154; c=relaxed/simple; bh=ly0c3pJmP9pxY2DunW1qi2CcXyhnnNLNsWInPxNGWxo=; h=Date:To:From:Subject:Message-Id; b=K6udPPxmN4UvXm/JU5EWeTm46ZZhVwH6I/Oi3lY0wrsoViZrTnenfTcjV7pH3qhkFOqaFfx2zV18yQmGOiqLSeNBzpUu7AmnTm1+ldhAz9oXddB4ZzwQuuQZgUMozOIewh3I1qJkhKaXS6DYBAHH75ARyLuVoHcVfVNkXT+zxPQ= 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=k/1ib9uE; 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="k/1ib9uE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C5AF01F000FF; Thu, 17 Sep 2026 04:42:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789620152; bh=OlJ6supEwJZwLKU2CFoEAfqLnveKR94TcsDWpmmeFws=; h=Date:To:From:Subject; b=k/1ib9uE6aR4Ls/hCMq0KvSXs6NeeDfwnPA3QtDj+M3jPaOMA05ncOK+1lJWkw/v3 Rh/patoxtbV2Pzdy3MYrYizAOQN7jTvvW08iU0JIJQyNkiGp+Hg3Uf1nz0nihuKKFZ oUPEfS3MjjrNBlTsV77BQeq+fUbBscjed225yvMU= Date: Wed, 16 Sep 2026 21:42:32 -0700 To: mm-commits@vger.kernel.org,ruirui.yang@linux.dev,rppt@kernel.org,pratyush@kernel.org,pasha.tatashin@soleen.com,baoquan.he@linux.dev,tz2294@columbia.edu,akpm@linux-foundation.org From: Andrew Morton Subject: + vmcore-convert-mmap_vmcore_fault-to-use-folios.patch added to mm-new branch Message-Id: <20260917044232.C5AF01F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: vmcore: convert mmap_vmcore_fault() to use folios has been added to the -mm mm-new branch. Its filename is vmcore-convert-mmap_vmcore_fault-to-use-folios.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/vmcore-convert-mmap_vmcore_fault-to-use-folios.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: Tal Zussman Subject: vmcore: convert mmap_vmcore_fault() to use folios Date: Tue, 15 Sep 2026 19:42:15 -0400 Use a folio for the page cache page the s390 fault handler reads the old kernel's memory into. This removes four compound_head() calls and one of the last callers of find_or_create_page(). The vmcore mapping only has order-0 folios, so the logic is unchanged. Compile tested for s390. Link: https://lore.kernel.org/20260915-vmcore-fault-folio-v1-1-a0cb6278670f@columbia.edu Signed-off-by: Tal Zussman Signed-off-by: Andrew Morton Cc: Baoquan He Cc: Dave Young Cc: Mike Rapoport Cc: Pasha Tatashin Cc: Pratyush Yadav --- fs/proc/vmcore.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) --- a/fs/proc/vmcore.c~vmcore-convert-mmap_vmcore_fault-to-use-folios +++ a/fs/proc/vmcore.c @@ -474,29 +474,30 @@ static vm_fault_t mmap_vmcore_fault(stru pgoff_t index = vmf->pgoff; struct iov_iter iter; struct kvec kvec; - struct page *page; + struct folio *folio; loff_t offset; int rc; - page = find_or_create_page(mapping, index, GFP_KERNEL); - if (!page) + folio = __filemap_get_folio(mapping, index, + FGP_LOCK | FGP_ACCESSED | FGP_CREAT, GFP_KERNEL); + if (IS_ERR(folio)) return VM_FAULT_OOM; - if (!PageUptodate(page)) { - offset = (loff_t) index << PAGE_SHIFT; - kvec.iov_base = page_address(page); - kvec.iov_len = PAGE_SIZE; - iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, PAGE_SIZE); + if (!folio_test_uptodate(folio)) { + offset = folio_pos(folio); + kvec.iov_base = folio_address(folio); + kvec.iov_len = folio_size(folio); + iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, folio_size(folio)); rc = __read_vmcore(&iter, &offset); if (rc < 0) { - unlock_page(page); - put_page(page); + folio_unlock(folio); + folio_put(folio); return vmf_error(rc); } - SetPageUptodate(page); + folio_mark_uptodate(folio); } - unlock_page(page); - vmf->page = page; + folio_unlock(folio); + vmf->page = folio_file_page(folio, index); return 0; #else return VM_FAULT_SIGBUS; _ Patches currently in -mm which might be from tz2294@columbia.edu are mm-page_io-convert-write-completion-handlers-to-folios.patch mm-remove-pagereclaim.patch mm-page_io-use-swap-entries-directly-in-zeromap-helpers.patch mm-page_io-rename-bio_associate_blkg_from_page.patch mm-page_io-refer-to-folios-in-swap_writeout-comments.patch mm-swap-rename-__swap_writepage-to-__swap_writeout.patch mm-remove-unused-mark_page_reserved.patch mm-remove-unused-totalram_pages_inc-and-totalram_pages_dec.patch mm-remove-pagewriteback.patch mm-swap-add-folio_swap_entry-and-folio_page_swap_entry.patch mm-swap-add-folio_swap_entry-and-folio_page_swap_entry-fix.patch mm-huge_memory-add-a-comment-to-the-open-coded-swap-entry.patch mm-rmap-use-folio_page_swap_entry-in-ttu_anon_swapbacked_folio.patch mm-zswap-use-folio_swap_entry-in-zswap_store_page.patch mm-swapfile-use-folio_page_swap_entry.patch arm64-mte-make-mte_save_tags-and-mte_restore_tags-static.patch arm64-mte-pass-the-swap-entry-to-mte_save_tags.patch mm-swap-remove-page_swap_entry.patch mm-memcontrol-take-a-const-folio-in-folio_memcg-and-friends.patch mm-memcontrol-constify-obj_cgroup_memcg-and-friends.patch mm-memcontrol-constify-the-lruvec-helpers.patch mm-page_io-take-a-const-folio-in-bio_associate_blkg_from_folio.patch mm-memcontrol-constify-the-mem_cgroup-accessors.patch mm-page_counter-constify-page_counter_read-and-page_counter_margin.patch mm-memcontrol-constify-the-reclaim-protection-helpers.patch mm-memcontrol-constify-the-memcg-and-lruvec-stat-readers.patch mm-memcontrol-constify-the-swap-accounting-helpers.patch mm-memcontrol-constify-mem_cgroup_swappiness-and-mem_cgroup_get_max.patch mm-memcontrol-constify-the-zswap-and-socket-pressure-helpers.patch vmcore-convert-mmap_vmcore_fault-to-use-folios.patch