mm: memcontrol: make cgroup_memory_nokmem static

Commit 494c1dfe855e ("mm: memcg/slab: create a new set of kmalloc-cg-<n>
caches") makes cgroup_memory_nokmem global, however, it is unnecessary
because there is already a function mem_cgroup_kmem_disabled() which
exports it.

Just make it static and replace it with mem_cgroup_kmem_disabled() in
mm/slab_common.c.

Link: https://lkml.kernel.org/r/20211109065418.21693-1-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Chris Down <chris@chrisdown.name>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/internal.h b/mm/internal.h
index 3b79a5c..bdac62e 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -158,11 +158,6 @@ extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason
 extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
 
 /*
- * in mm/memcontrol.c:
- */
-extern bool cgroup_memory_nokmem;
-
-/*
  * in mm/page_alloc.c
  */
 

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3542237..bfe9bde 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -84,7 +84,7 @@ EXPORT_PER_CPU_SYMBOL_GPL(int_active_memcg);
 static bool cgroup_memory_nosocket __ro_after_init;
 
 /* Kernel memory accounting disabled? */
-bool cgroup_memory_nokmem __ro_after_init;
+static bool cgroup_memory_nokmem __ro_after_init;
 
 /* Whether the swap controller is active */
 #ifdef CONFIG_MEMCG_SWAP

diff --git a/mm/slab_common.c b/mm/slab_common.c
index f02c32b..1f75bd4 100644 (file)
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -844,7 +844,7 @@ new_kmalloc_cache(int idx, enum kmalloc_cache_type type, slab_flags_t flags)
        if (type == KMALLOC_RECLAIM) {
                flags |= SLAB_RECLAIM_ACCOUNT;
        } else if (IS_ENABLED(CONFIG_MEMCG_KMEM) && (type == KMALLOC_CGROUP)) {
-               if (cgroup_memory_nokmem) {
+               if (mem_cgroup_kmem_disabled()) {
                        kmalloc_caches[type][idx] = kmalloc_caches[KMALLOC_NORMAL][idx];
                        return;
                }