[PATCH 1/2] mm: memcontrol: unshare v2-only charge API bits again

Johannes Weiner
2025-01-24T04:39:11Z

6b611388b626 ("memcg-v1: remove charge move code") removed the
remaining v1 callers.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
mm/memcontrol-v1.h | 15 ---------------
mm/memcontrol.c | 17 +++++++++++++----
2 files changed, 13 insertions(+), 19 deletions(-)

diff --git a/mm/memcontrol-v1.h b/mm/memcontrol-v1.h
index 144d71b65907..6dd7eaf96856 100644
--- a/mm/memcontrol-v1.h
+++ b/mm/memcontrol-v1.h
@@ -7,21 +7,6 @@

/* Cgroup v1 and v2 common declarations */

-int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,
- unsigned int nr_pages);
-
-static inline int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
- unsigned int nr_pages)
-{
- if (mem_cgroup_is_root(memcg))
- return 0;
-
- return try_charge_memcg(memcg, gfp_mask, nr_pages);
-}
-
-void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n);
-void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n);
-
/*
* Iteration constructs for visiting all cgroups (under a tree). If
* loops are exited prematurely (break), mem_cgroup_iter_break() must
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 46f8b372d212..818143b81760 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2198,8 +2198,8 @@ void mem_cgroup_handle_over_high(gfp_t gfp_mask)
css_put(&memcg->css);
}

-int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,
- unsigned int nr_pages)
+static int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,
+ unsigned int nr_pages)
{
unsigned int batch = max(MEMCG_CHARGE_BATCH, nr_pages);
int nr_retries = MAX_RECLAIM_RETRIES;
@@ -2388,6 +2388,15 @@ int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,
return 0;
}

+static inline int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
+ unsigned int nr_pages)
+{
+ if (mem_cgroup_is_root(memcg))
+ return 0;
+
+ return try_charge_memcg(memcg, gfp_mask, nr_pages);
+}
+
static void commit_charge(struct folio *folio, struct mem_cgroup *memcg)
{
VM_BUG_ON_FOLIO(folio_memcg_charged(folio), folio);
@@ -3368,13 +3377,13 @@ static void mem_cgroup_id_remove(struct mem_cgroup *memcg)
}
}

-void __maybe_unused mem_cgroup_id_get_many(struct mem_cgroup *memcg,
+static void __maybe_unused mem_cgroup_id_get_many(struct mem_cgroup *memcg,
unsigned int n)
{
refcount_add(n, &memcg->id.ref);
}

-void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n)
+static void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n)
{
if (refcount_sub_and_test(n, &memcg->id.ref)) {
mem_cgroup_id_remove(memcg);
--
2.48.1