+ mm-memcontrol-constify-mem_cgroup_swappiness-and-mem_cgroup_get_max.patch added to mm-new branch

+ mm-memcontrol-constify-mem_cgroup_swappiness-and-mem_cgroup_get_max.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm: memcontrol: constify mem_cgroup_swappiness() and mem_cgroup_get_max()
has been added to the -mm mm-new branch.  Its filename is
     mm-memcontrol-constify-mem_cgroup_swappiness-and-mem_cgroup_get_max.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcontrol-constify-mem_cgroup_swappiness-and-mem_cgroup_get_max.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
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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and is updated there most days

------------------------------------------------------
From: Tal Zussman <tz2294@columbia.edu>
Subject: mm: memcontrol: constify mem_cgroup_swappiness() and mem_cgroup_get_max()
Date: Tue, 15 Sep 2026 19:20:14 -0400

Both only read swappiness and the memory limits. Constify them.

Link: https://lore.kernel.org/20260915-folio_memcg-const-v3-10-c239a6010b58@columbia.edu
Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Muchun Song <muchun.song@linux.dev>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
---

 include/linux/memcontrol.h |    4 ++--
 mm/memcontrol.c            |    2 +-
 mm/swap.h                  |    2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

--- a/include/linux/memcontrol.h~mm-memcontrol-constify-mem_cgroup_swappiness-and-mem_cgroup_get_max
+++ a/include/linux/memcontrol.h
@@ -941,7 +941,7 @@ static inline void mem_cgroup_handle_ove
 		__mem_cgroup_handle_over_high(gfp_mask);
 }
 
-unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg);
+unsigned long mem_cgroup_get_max(const struct mem_cgroup *memcg);
 
 void mem_cgroup_print_oom_context(const struct mem_cgroup *memcg,
 				struct task_struct *p);
@@ -1372,7 +1372,7 @@ unsigned long mem_cgroup_get_zone_lru_si
 	return 0;
 }
 
-static inline unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg)
+static inline unsigned long mem_cgroup_get_max(const struct mem_cgroup *memcg)
 {
 	return 0;
 }
--- a/mm/memcontrol.c~mm-memcontrol-constify-mem_cgroup_swappiness-and-mem_cgroup_get_max
+++ a/mm/memcontrol.c
@@ -1884,7 +1884,7 @@ void mem_cgroup_print_oom_meminfo(struct
 /*
  * Return the memory (and swap, if configured) limit for a memcg.
  */
-unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg)
+unsigned long mem_cgroup_get_max(const struct mem_cgroup *memcg)
 {
 	unsigned long max = READ_ONCE(memcg->memory.max);
 
--- a/mm/swap.h~mm-memcontrol-constify-mem_cgroup_swappiness-and-mem_cgroup_get_max
+++ a/mm/swap.h
@@ -82,7 +82,7 @@ enum swap_cluster_flags {
 
 extern int vm_swappiness;
 
-static inline int mem_cgroup_swappiness(struct mem_cgroup *memcg)
+static inline int mem_cgroup_swappiness(const struct mem_cgroup *memcg)
 {
 #ifdef CONFIG_MEMCG_V1
 	if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) &&
_

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