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 5D9E95964E4 for ; Tue, 8 Sep 2026 17:55:26 +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=1788890127; cv=none; b=hk7hwDab5umv5Yo3tl28XOYyb6Cf/4wV5EY5naLyGb/qNOA3WJ+1ecd50a+0Xy0kKCiQfCRlOhHsytCUQ9cgNFl7wQD1Vrds7WI77TT+UX95BTNytAstnt3jZ66j78ePzjkEJZsbMh7UidYcO3YRmutyxLOBW6wwABXUmyXI95M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788890127; c=relaxed/simple; bh=ZwJmnIxMS9L3z4HKCgZwWCOlYupN7F16MDops3yIMz0=; h=Date:To:From:Subject:Message-Id; b=b9usWS8UV47JNdCffJuBUPZzARGxCzzDlk4y5hko6XPgwABCSIWxinB1cM85HzI/XOqq0YrOGWtJhqfyL2HULc/IrftQz6mkKw2muKt4bNJvxjLmdQSyWKQVPeGy+IMF95otVR8HDq8sBmj40aUxLL6KvVlxrOm+5TfJbpriub4= 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=cAVjC+Be; 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="cAVjC+Be" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 036971F00A3A; Tue, 8 Sep 2026 17:55:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1788890126; bh=3OYYJgTV3lUHlJbgYNeqEnBHbRH+9XBnUMD7kYF6aRk=; h=Date:To:From:Subject; b=cAVjC+Bel1ywLmlSiUE8XZl2d+kt00Z2gO5wdXiOwkg+HwxmX0VqQk1R4uCsg2VLS 0kI3H8Ax9fnyRY4vgbUV+ze67gdpLXcKT3VsnCwRl3zOSBSus4vH4o6n4yBeoa9gC4 2Suu+HiFh58xFxuPyDgkKLpfMKnOMI4HsPKn6UlQ= Date: Tue, 08 Sep 2026 10:55:25 -0700 To: mm-commits@vger.kernel.org,tz2294@columbia.edu,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-huge_memory-add-a-comment-to-the-open-coded-swap-entry.patch added to mm-new branch Message-Id: <20260908175526.036971F00A3A@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/huge_memory: add a comment to the open-coded swap entry has been added to the -mm mm-new branch. Its filename is mm-huge_memory-add-a-comment-to-the-open-coded-swap-entry.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-add-a-comment-to-the-open-coded-swap-entry.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: mm/huge_memory: add a comment to the open-coded swap entry Date: Tue, 08 Sep 2026 11:16:32 -0400 The swap entry of each new folio in __split_folio_to_order() is computed by hand from folio->swap rather than with folio_swap_entry(), because the folio's page count is not valid while it is being split. Add a comment explaining this. Link: https://lore.kernel.org/20260908-folio_swap_entry-v2-2-ee6d01dfa5e1@columbia.edu Signed-off-by: Tal Zussman Reviewed-by: Zi Yan Cc: Baolin Wang Cc: Baoquan He Cc: Barry Song Cc: Catalin Marinas Cc: Chengming Zhou Cc: Chris Li Cc: David Hildenbrand Cc: Dev Jain Cc: Harry Yoo Cc: Jann Horn Cc: Johannes Weiner Cc: Kairui Song Cc: Kemeng Shi Cc: Kiryl Shutsemau Cc: Lance Yang Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Marc Rutland Cc: Nhat Pham Cc: Rik van Riel Cc: Ryan Roberts Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton --- mm/huge_memory.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/mm/huge_memory.c~mm-huge_memory-add-a-comment-to-the-open-coded-swap-entry +++ a/mm/huge_memory.c @@ -3763,6 +3763,10 @@ static void __split_folio_to_order(struc */ VM_WARN_ON_ONCE_PAGE(new_folio->private, new_head); + /* + * Not all folio fields are valid during a split, so open-code + * the swap entry rather than using folio_swap_entry(). + */ if (folio_test_swapcache(folio)) new_folio->swap.val = folio->swap.val + i; _ 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-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