[merged mm-stable] mm-memcontrol-factor-out-memcg-kmem-uncharge-sequence.patch removed from -mm tree

[merged mm-stable] mm-memcontrol-factor-out-memcg-kmem-uncharge-sequence.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: memcontrol: factor out memcg kmem uncharge sequence
has been removed from the -mm tree.  Its filename was
     mm-memcontrol-factor-out-memcg-kmem-uncharge-sequence.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: Guopeng Zhang <zhangguopeng@kylinos.cn>
Subject: mm: memcontrol: factor out memcg kmem uncharge sequence
Date: Mon, 13 Jul 2026 17:03:04 +0800

The kmem-uncharge sequence (mod_memcg_state(MEMCG_KMEM) +
memcg1_account_kmem + conditional memcg_uncharge) is duplicated verbatim
in obj_cgroup_release() and drain_obj_stock_slot().  Factor it into a
small memcg_uncharge_kmem() helper.  The reference get/put stays at the
call sites, as they differ.

No functional change.

Link: https://lore.kernel.org/20260713090304.3015329-1-guopeng.zhang@linux.dev
Signed-off-by: Guopeng Zhang <zhangguopeng@kylinos.cn>
Acked-by: Tao Cui <cuitao@kylinos.cn>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memcontrol.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

--- a/mm/memcontrol.c~mm-memcontrol-factor-out-memcg-kmem-uncharge-sequence
+++ a/mm/memcontrol.c
@@ -137,6 +137,14 @@ bool mem_cgroup_kmem_disabled(void)
 
 static void memcg_uncharge(struct mem_cgroup *memcg, unsigned int nr_pages);
 
+static void memcg_uncharge_kmem(struct mem_cgroup *memcg, unsigned int nr_pages)
+{
+	mod_memcg_state(memcg, MEMCG_KMEM, -nr_pages);
+	memcg1_account_kmem(memcg, -nr_pages);
+	if (!mem_cgroup_is_root(memcg))
+		memcg_uncharge(memcg, nr_pages);
+}
+
 static void obj_cgroup_release(struct percpu_ref *ref)
 {
 	struct obj_cgroup *objcg = container_of(ref, struct obj_cgroup, refcnt);
@@ -172,10 +180,7 @@ static void obj_cgroup_release(struct pe
 		struct mem_cgroup *memcg;
 
 		memcg = get_mem_cgroup_from_objcg(objcg);
-		mod_memcg_state(memcg, MEMCG_KMEM, -nr_pages);
-		memcg1_account_kmem(memcg, -nr_pages);
-		if (!mem_cgroup_is_root(memcg))
-			memcg_uncharge(memcg, nr_pages);
+		memcg_uncharge_kmem(memcg, nr_pages);
 		mem_cgroup_put(memcg);
 	}
 
@@ -3329,10 +3334,7 @@ static void drain_obj_stock_slot(struct
 
 			memcg = get_mem_cgroup_from_objcg(old);
 
-			mod_memcg_state(memcg, MEMCG_KMEM, -nr_pages);
-			memcg1_account_kmem(memcg, -nr_pages);
-			if (!mem_cgroup_is_root(memcg))
-				memcg_uncharge(memcg, nr_pages);
+			memcg_uncharge_kmem(memcg, nr_pages);
 
 			css_put(&memcg->css);
 		}
_

Patches currently in -mm which might be from zhangguopeng@kylinos.cn are

mm-memcg-stop-reclaim-when-a-limit-update-is-superseded.patch