[merged mm-stable] memcg-remove-root-memcg-check-from-refill_stock.patch removed from -mm tree

[merged mm-stable] memcg-remove-root-memcg-check-from-refill_stock.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: memcg: remove root memcg check from refill_stock
has been removed from the -mm tree.  Its filename was
     memcg-remove-root-memcg-check-from-refill_stock.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: Shakeel Butt <shakeel.butt@linux.dev>
Subject: memcg: remove root memcg check from refill_stock
Date: Thu, 3 Apr 2025 18:39:05 -0700

refill_stock can not be called with root memcg, so there is no need to
check it.  Instead add a warning if root is ever passed to it.

Link: https://lkml.kernel.org/r/20250404013913.1663035-1-shakeel.butt@linux.dev
Link: https://lkml.kernel.org/r/20250404013913.1663035-2-shakeel.butt@linux.dev
Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memcontrol.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/memcontrol.c~memcg-remove-root-memcg-check-from-refill_stock
+++ a/mm/memcontrol.c
@@ -1893,13 +1893,13 @@ static void refill_stock(struct mem_cgro
 {
 	unsigned long flags;
 
+	VM_WARN_ON_ONCE(mem_cgroup_is_root(memcg));
+
 	if (!local_trylock_irqsave(&memcg_stock.stock_lock, flags)) {
 		/*
 		 * In case of unlikely failure to lock percpu stock_lock
 		 * uncharge memcg directly.
 		 */
-		if (mem_cgroup_is_root(memcg))
-			return;
 		page_counter_uncharge(&memcg->memory, nr_pages);
 		if (do_memsw_account())
 			page_counter_uncharge(&memcg->memsw, nr_pages);
_

Patches currently in -mm which might be from shakeel.butt@linux.dev are

memcg-introduce-non-blocking-limit-setting-option.patch
memcg-introduce-non-blocking-limit-setting-option-v3.patch
memcg-simplify-consume_stock.patch
memcg-separate-local_trylock-for-memcg-and-obj.patch
memcg-completely-decouple-memcg-and-obj-stocks.patch
memcg-no-irq-disable-for-memcg-stock-lock.patch