mm: slab: rename (un)charge_slab_page() to (un)account_slab_page()

charge_slab_page() and uncharge_slab_page() are not related anymore to
memcg charging and uncharging.  In order to make their names less
confusing, let's rename them to account_slab_page() and
unaccount_slab_page() respectively.

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Link: http://lkml.kernel.org/r/20200707173612.124425-2-guro@fb.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/slab.h

@@ -423,15 +423,15 @@ static inline struct kmem_cache *virt_to_cache(const void *obj)
 	return page->slab_cache;
 }
 
-static __always_inline void charge_slab_page(struct page *page, int order,
-					     struct kmem_cache *s)
+static __always_inline void account_slab_page(struct page *page, int order,
+					      struct kmem_cache *s)
 {
 	mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
 			    PAGE_SIZE << order);
 }
 
-static __always_inline void uncharge_slab_page(struct page *page, int order,
-					       struct kmem_cache *s)
+static __always_inline void unaccount_slab_page(struct page *page, int order,
+						struct kmem_cache *s)
 {
 	if (memcg_kmem_enabled())
 		memcg_free_page_obj_cgroups(page);