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 0990630BF52 for ; Fri, 24 Apr 2026 10:31:04 +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=1777026665; cv=none; b=EXBv5iBxqhDPhFgSnuoqzZICAeujHy8sgzWdYNEvwwztEeGuKwhp7S1kyWuDGKAYthfL3CuiGo1oahHHMUZCEex0Aed+NROUi7kenkBb/iZ1x15S/FUI97eP8LJB1SBuZ3qZKAPYe/NQcvHIpaJzx4ol6USE/95Ts32LK6AsKY0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777026665; c=relaxed/simple; bh=xXmLQW6t3aIOIG/L/7SU+g8qLHM/tyoykIL1rXWSUSw=; h=Date:To:From:Subject:Message-Id; b=Ve9DnoFi2q/r2pQGEuLSAUPOf1gLmO/DK0zM2hL5yyIepUHzL6OeXtSrBXbq8zESvYZYKdpo7E0Ja8TpO9DIAvgN6KVCYZdbMcj2BU37o4oezVV0jLlKBs9btPO2izrADXtPMdK1QGWqKf+oyV3OqEtZjcnYntaIn4RjVMizmHw= 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=XpVOgvX2; 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="XpVOgvX2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88CD9C19425; Fri, 24 Apr 2026 10:31:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1777026664; bh=xXmLQW6t3aIOIG/L/7SU+g8qLHM/tyoykIL1rXWSUSw=; h=Date:To:From:Subject:From; b=XpVOgvX2gJ8lEQXjIRBtkuEB/6yTjJJzzRoRYQc/xQmjCAiPX2s5+cZU3wbGfm7zf XFl1gG4o9IM9X/Fi0C20tyyefl1om5s4NVL1jwL4ysmQ4Hx4B2pP1Ez7MMJoyIfKvz f9mw75ji4SADy/1JAaozjTHuHcGrTjGGDujzBqRE= Date: Fri, 24 Apr 2026 03:31:04 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-remove-read_only_thp_for_fs-kconfig-option.patch added to mm-new branch Message-Id: <20260424103104.88CD9C19425@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: remove READ_ONLY_THP_FOR_FS Kconfig option has been added to the -mm mm-new branch. Its filename is mm-remove-read_only_thp_for_fs-kconfig-option.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-remove-read_only_thp_for_fs-kconfig-option.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: Zi Yan Subject: mm: remove READ_ONLY_THP_FOR_FS Kconfig option Date: Thu, 23 Apr 2026 22:49:08 -0400 After removing READ_ONLY_THP_FOR_FS check in file_thp_enabled(), khugepaged and MADV_COLLAPSE can run on FSes with PMD THP pagecache support even without READ_ONLY_THP_FOR_FS enabled. Remove the Kconfig first so that no one can use READ_ONLY_THP_FOR_FS as upcoming commits remove mapping->nr_thps, which its safe guard mechanism relies on. Link: https://lore.kernel.org/20260424024915.28758-6-ziy@nvidia.com Signed-off-by: Zi Yan Reviewed-by: Lorenzo Stoakes (Oracle) Acked-by: David Hildenbrand (Arm) Reviewed-by: Baolin Wang Cc: Al Viro Cc: Barry Song Cc: Chris Mason Cc: Christian Brauner Cc: David Sterba Cc: Dev Jain Cc: Jan Kara Cc: Lance Yang Cc: Liam Howlett Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Nico Pache Cc: Ryan Roberts Cc: Shuah Khan Cc: Song Liu Cc: Suren Baghdasaryan Signed-off-by: Andrew Morton --- mm/Kconfig | 11 ----------- 1 file changed, 11 deletions(-) --- a/mm/Kconfig~mm-remove-read_only_thp_for_fs-kconfig-option +++ a/mm/Kconfig @@ -938,17 +938,6 @@ config THP_SWAP For selection by architectures with reasonable THP sizes. -config READ_ONLY_THP_FOR_FS - bool "Read-only THP for filesystems (EXPERIMENTAL)" - depends on TRANSPARENT_HUGEPAGE - - help - Allow khugepaged to put read-only file-backed pages in THP. - - This is marked experimental because it is a new feature. Write - support of file THPs will be developed in the next few release - cycles. - config NO_PAGE_MAPCOUNT bool "No per-page mapcount (EXPERIMENTAL)" help _ Patches currently in -mm which might be from ziy@nvidia.com are mm-khugepaged-remove-read_only_thp_for_fs-check.patch mm-khugepaged-add-folio-dirty-check-after-try_to_unmap.patch mm-huge_memory-remove-read_only_thp_for_fs-from-file_thp_enabled.patch mm-khugepaged-remove-read_only_thp_for_fs-check-in-hugepage_enabled.patch mm-remove-read_only_thp_for_fs-kconfig-option.patch mm-fs-remove-filemap_nr_thps-functions-and-their-users.patch fs-remove-nr_thps-from-struct-address_space.patch mm-huge_memory-remove-folio-split-check-for-read_only_thp_for_fs.patch mm-truncate-use-folio_split-in-truncate_inode_partial_folio.patch fs-btrfs-remove-a-comment-referring-to-read_only_thp_for_fs.patch selftests-mm-remove-read_only_thp_for_fs-in-khugepaged.patch selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions.patch