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Date:   Thu, 7 Jan 2021 18:03:32 -0800
From:   Roman Gushchin <guro@...com>
To:     Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>
CC:     Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...com>,
        Roman Gushchin <guro@...com>
Subject: [PATCH] mm: kmem: make __memcg_kmem_(un)charge static

I've noticed that __memcg_kmem_charge() and __memcg_kmem_uncharge()
are not used anywhere except memcontrol.c. Yet they are not declared
as non-static and are declared in memcontrol.h.

This patch makes them static.

Signed-off-by: Roman Gushchin <guro@...com>
---
 include/linux/memcontrol.h |  3 ---
 mm/memcontrol.c            | 11 ++++++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 41bbf71edd9f..7a38a1517a05 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1592,9 +1592,6 @@ static inline void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
 #endif
 
 #ifdef CONFIG_MEMCG_KMEM
-int __memcg_kmem_charge(struct mem_cgroup *memcg, gfp_t gfp,
-			unsigned int nr_pages);
-void __memcg_kmem_uncharge(struct mem_cgroup *memcg, unsigned int nr_pages);
 int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order);
 void __memcg_kmem_uncharge_page(struct page *page, int order);
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 0d74b80fa4de..61f7c9ca14b7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -255,6 +255,11 @@ struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr)
 #ifdef CONFIG_MEMCG_KMEM
 extern spinlock_t css_set_lock;
 
+static int __memcg_kmem_charge(struct mem_cgroup *memcg, gfp_t gfp,
+			       unsigned int nr_pages);
+static void __memcg_kmem_uncharge(struct mem_cgroup *memcg,
+				  unsigned int nr_pages);
+
 static void obj_cgroup_release(struct percpu_ref *ref)
 {
 	struct obj_cgroup *objcg = container_of(ref, struct obj_cgroup, refcnt);
@@ -3084,8 +3089,8 @@ static void memcg_free_cache_id(int id)
  *
  * Returns 0 on success, an error code on failure.
  */
-int __memcg_kmem_charge(struct mem_cgroup *memcg, gfp_t gfp,
-			unsigned int nr_pages)
+static int __memcg_kmem_charge(struct mem_cgroup *memcg, gfp_t gfp,
+			       unsigned int nr_pages)
 {
 	struct page_counter *counter;
 	int ret;
@@ -3117,7 +3122,7 @@ int __memcg_kmem_charge(struct mem_cgroup *memcg, gfp_t gfp,
  * @memcg: memcg to uncharge
  * @nr_pages: number of pages to uncharge
  */
-void __memcg_kmem_uncharge(struct mem_cgroup *memcg, unsigned int nr_pages)
+static void __memcg_kmem_uncharge(struct mem_cgroup *memcg, unsigned int nr_pages)
 {
 	if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
 		page_counter_uncharge(&memcg->kmem, nr_pages);
-- 
2.26.2

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