[merged mm-stable] mm-page_counter-constify-page_counter_read-and-page_counter_margin.patch removed from -mm tree

[merged mm-stable] mm-page_counter-constify-page_counter_read-and-page_counter_margin.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: page_counter: constify page_counter_read() and page_counter_margin()
has been removed from the -mm tree.  Its filename was
     mm-page_counter-constify-page_counter_read-and-page_counter_margin.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Tal Zussman <tz2294@columbia.edu>
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 <tz2294@columbia.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-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/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