[PATCH v2 01/13] mm: move mem_cgroup_kmem_disabled() to memcontrol.h

[Muchun Song]

The cgroup_memory_nokmem is already a global variable, it is unnecessary
to define a global function of mem_cgroup_kmem_disabled(). Just move it
to memcontrol.h and mark inline on it. slab_common.c already includes
memcontrol.h, replace cgroup_memory_nokmem with mem_cgroup_kmem_disabled().

Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
---
 include/linux/memcontrol.h | 8 +++++++-
 mm/internal.h              | 5 -----
 mm/memcontrol.c            | 5 -----
 mm/slab_common.c           | 2 +-
 4 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 3096c9a0ee01..e194d90aff56 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1639,7 +1639,13 @@ static inline void set_shrinker_bit(struct mem_cgroup *memcg,
 #endif
 
 #ifdef CONFIG_MEMCG_KMEM
-bool mem_cgroup_kmem_disabled(void);
+extern bool cgroup_memory_nokmem;
+
+static inline bool mem_cgroup_kmem_disabled(void)
+{
+	return cgroup_memory_nokmem;
+}
+
 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/internal.h b/mm/internal.h
index cf3cb933eba3..649684e20fe4 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -116,11 +116,6 @@ extern void putback_lru_page(struct page *page);
 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 b762215d73eb..528b134ca50c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -264,11 +264,6 @@ struct mem_cgroup *vmpressure_to_memcg(struct vmpressure *vmpr)
 #ifdef CONFIG_MEMCG_KMEM
 extern spinlock_t css_set_lock;
 
-bool mem_cgroup_kmem_disabled(void)
-{
-	return cgroup_memory_nokmem;
-}
-
 static void obj_cgroup_uncharge_pages(struct obj_cgroup *objcg,
 				      unsigned int nr_pages);
 
diff --git a/mm/slab_common.c b/mm/slab_common.c
index ec2bb0beed75..4c0549e0f349 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -857,7 +857,7 @@ 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;
 		}
-- 
2.11.0