[PATCH 3/5] mm: memcg/slab: Rename *_lruvec_slab_state to *_lruvec_kmem_state

[Muchun Song]

The *_lruvec_slab_state is also suitable for pages allocated from buddy,
not just for the slab objects. But the function name seems to tell us that
only slab object is applicable. So we can rename the keyword of slab to
kmem.

Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
---
 include/linux/memcontrol.h | 18 +++++++++---------
 kernel/fork.c              |  2 +-
 mm/memcontrol.c            |  3 ++-
 mm/workingset.c            |  8 ++++----
 4 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d7e339bf72dc..95807bf6be64 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -793,15 +793,15 @@ void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
 			      int val);
 void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
 			int val);
-void __mod_lruvec_slab_state(void *p, enum node_stat_item idx, int val);
+void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val);
 
-static inline void mod_lruvec_slab_state(void *p, enum node_stat_item idx,
+static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
 					 int val)
 {
 	unsigned long flags;
 
 	local_irq_save(flags);
-	__mod_lruvec_slab_state(p, idx, val);
+	__mod_lruvec_kmem_state(p, idx, val);
 	local_irq_restore(flags);
 }
 
@@ -1227,7 +1227,7 @@ static inline void mod_lruvec_page_state(struct page *page,
 	mod_node_page_state(page_pgdat(page), idx, val);
 }
 
-static inline void __mod_lruvec_slab_state(void *p, enum node_stat_item idx,
+static inline void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
 					   int val)
 {
 	struct page *page = virt_to_head_page(p);
@@ -1235,7 +1235,7 @@ static inline void __mod_lruvec_slab_state(void *p, enum node_stat_item idx,
 	__mod_node_page_state(page_pgdat(page), idx, val);
 }
 
-static inline void mod_lruvec_slab_state(void *p, enum node_stat_item idx,
+static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
 					 int val)
 {
 	struct page *page = virt_to_head_page(p);
@@ -1330,14 +1330,14 @@ static inline void __dec_lruvec_page_state(struct page *page,
 	__mod_lruvec_page_state(page, idx, -1);
 }
 
-static inline void __inc_lruvec_slab_state(void *p, enum node_stat_item idx)
+static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx)
 {
-	__mod_lruvec_slab_state(p, idx, 1);
+	__mod_lruvec_kmem_state(p, idx, 1);
 }
 
-static inline void __dec_lruvec_slab_state(void *p, enum node_stat_item idx)
+static inline void __dec_lruvec_kmem_state(void *p, enum node_stat_item idx)
 {
-	__mod_lruvec_slab_state(p, idx, -1);
+	__mod_lruvec_kmem_state(p, idx, -1);
 }
 
 /* idx can be of type enum memcg_stat_item or node_stat_item */
diff --git a/kernel/fork.c b/kernel/fork.c
index 4b328aecabb2..4fb0bbc3b041 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -384,7 +384,7 @@ static void account_kernel_stack(struct task_struct *tsk, int account)
 		mod_lruvec_page_state(vm->pages[0], NR_KERNEL_STACK_KB,
 				      account * (THREAD_SIZE / 1024));
 	else
-		mod_lruvec_slab_state(stack, NR_KERNEL_STACK_KB,
+		mod_lruvec_kmem_state(stack, NR_KERNEL_STACK_KB,
 				      account * (THREAD_SIZE / 1024));
 }
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c0c27bee23ad..22b4fb941b54 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -866,7 +866,7 @@ void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
 		__mod_memcg_lruvec_state(lruvec, idx, val);
 }
 
-void __mod_lruvec_slab_state(void *p, enum node_stat_item idx, int val)
+void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val)
 {
 	pg_data_t *pgdat = page_pgdat(virt_to_page(p));
 	struct mem_cgroup *memcg;
@@ -2920,6 +2920,7 @@ struct mem_cgroup *mem_cgroup_from_obj(void *p)
 	if (mem_cgroup_disabled())
 		return NULL;
 
+	VM_BUG_ON(!virt_addr_valid(p));
 	page = virt_to_head_page(p);
 
 	/*
diff --git a/mm/workingset.c b/mm/workingset.c
index 50d53f3699e4..2c707c92dd89 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -445,12 +445,12 @@ void workingset_update_node(struct xa_node *node)
 	if (node->count && node->count == node->nr_values) {
 		if (list_empty(&node->private_list)) {
 			list_lru_add(&shadow_nodes, &node->private_list);
-			__inc_lruvec_slab_state(node, WORKINGSET_NODES);
+			__inc_lruvec_kmem_state(node, WORKINGSET_NODES);
 		}
 	} else {
 		if (!list_empty(&node->private_list)) {
 			list_lru_del(&shadow_nodes, &node->private_list);
-			__dec_lruvec_slab_state(node, WORKINGSET_NODES);
+			__dec_lruvec_kmem_state(node, WORKINGSET_NODES);
 		}
 	}
 }
@@ -541,7 +541,7 @@ static enum lru_status shadow_lru_isolate(struct list_head *item,
 	}
 
 	list_lru_isolate(lru, item);
-	__dec_lruvec_slab_state(node, WORKINGSET_NODES);
+	__dec_lruvec_kmem_state(node, WORKINGSET_NODES);
 
 	spin_unlock(lru_lock);
 
@@ -564,7 +564,7 @@ static enum lru_status shadow_lru_isolate(struct list_head *item,
 	 * shadow entries we were tracking ...
 	 */
 	xas_store(&xas, NULL);
-	__inc_lruvec_slab_state(node, WORKINGSET_NODERECLAIM);
+	__inc_lruvec_kmem_state(node, WORKINGSET_NODERECLAIM);
 
 out_invalid:
 	xa_unlock_irq(&mapping->i_pages);
-- 
2.20.1