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 3A44D4D6C5E for ; Wed, 16 Sep 2026 21:54:48 +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=1789595698; cv=none; b=rO5uWO5tpfOfmwkH5XOwD6w8TCCODENw9InUZVsEbyIJU7+bBSyc7vKsIxEA0AcYqvcHdiqoy6U+XXlI5sSjKrOhYyczexTqQkZBLEfBbGG9acxmCvWRnSoPNz8Bzjco1WOgNsAfV/U/yyPbe8RETi/Cn6mWLTtoGMVKElVHzv0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789595698; c=relaxed/simple; bh=ZOcZFotI5UW7Wr3mF0nrItck5abrg8OwROz5E3MXwM0=; h=Date:To:From:Subject:Message-Id; b=oAktte7XWi467mtr5ydOdFxdFhP4l7Pqr98wStpXgjpbYLFWarBekS+bm5BYZdXl0B7keL9zhS+FPFjpjvAWUoAI5ZAxZLy3c7k7gST/oxLZ6e4xaAyBiIJBWyX+J9wnmJG/8LrHppGQV2v3/EbpD+nESgnGofEHRLqTVzPlvXM= 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=RgeETZYe; 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="RgeETZYe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 822361F0089A; Wed, 16 Sep 2026 21:54:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789595686; bh=OF2sbOpaJg0p5sk/FmfTbhyRi5ggcQj/nVVZwJfqPz8=; h=Date:To:From:Subject; b=RgeETZYeKgjIbnBO3HxaWOD1VRrDGmD+xTNCFOK4G0CNn8d3s3VIS7oRfjIJTCDR3 s2EVyuiB9a4oDxP+5GeP+eGFh/E+dEl1RvimIhpnOt768ABSyj7+3MCs/HZD160Ehe 5iYF436z0B/j9DZTtJaMelRVj5JcOwmO9a5qpr2E= Date: Wed, 16 Sep 2026 14:54:46 -0700 To: mm-commits@vger.kernel.org,tz2294@columbia.edu,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-page_counter-constify-page_counter_read-and-page_counter_margin.patch added to mm-new branch Message-Id: <20260916215446.822361F0089A@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: page_counter: constify page_counter_read() and page_counter_margin() has been added to the -mm mm-new branch. Its filename is mm-page_counter-constify-page_counter_read-and-page_counter_margin.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_counter-constify-page_counter_read-and-page_counter_margin.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: page_counter: constify page_counter_read() and page_counter_margin() Date: Tue, 15 Sep 2026 19:20:10 -0400 Both only read the counter. Constify them so that users can read counters from const memcgs. Link: https://lore.kernel.org/20260915-folio_memcg-const-v3-6-c239a6010b58@columbia.edu Signed-off-by: Tal Zussman Signed-off-by: Andrew Morton Reviewed-by: Muchun Song Acked-by: Shakeel Butt Acked-by: Lorenzo Stoakes (ARM) Cc: Axel Rasmussen Cc: Baolin Wang Cc: Baoquan He Cc: Barry Song Cc: Chris Li Cc: David Hildenbrand Cc: Johannes Weiner Cc: Kairui Song Cc: Kemeng Shi Cc: Liam R. Howlett Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Nhat Pham Cc: Roman Gushchin Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Wei Xu Cc: Yuanchu Xie --- include/linux/page_counter.h | 4 ++-- mm/page_counter.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) --- a/include/linux/page_counter.h~mm-page_counter-constify-page_counter_read-and-page_counter_margin +++ a/include/linux/page_counter.h @@ -63,12 +63,12 @@ static inline void page_counter_init(str counter->track_failcnt = false; } -static inline unsigned long page_counter_read(struct page_counter *counter) +static inline unsigned long page_counter_read(const struct page_counter *counter) { return atomic_long_read(&counter->usage); } -long page_counter_margin(struct page_counter *counter); +long page_counter_margin(const struct page_counter *counter); void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages); void page_counter_charge(struct page_counter *counter, unsigned long nr_pages); bool page_counter_try_charge(struct page_counter *counter, --- a/mm/page_counter.c~mm-page_counter-constify-page_counter_read-and-page_counter_margin +++ a/mm/page_counter.c @@ -54,7 +54,7 @@ static void propagate_protected_usage(st * Return: The minimum value of max minus usage across @counter and all of * its ancestors. The value may be negative during a concurrent charge. */ -long page_counter_margin(struct page_counter *counter) +long page_counter_margin(const struct page_counter *counter) { long margin = PAGE_COUNTER_MAX; _ 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