change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/mm/list_lru.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (c) 2013 Red Hat, Inc. and Parallels Inc. All rights reserved.
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  * Authors: David Chinner and Glauber Costa
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@@ -11,6 +12,7 @@
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 #include <linux/slab.h>
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 #include <linux/mutex.h>
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 #include <linux/memcontrol.h>
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+#include "slab.h"
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 #ifdef CONFIG_MEMCG_KMEM
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 static LIST_HEAD(list_lrus);
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@@ -55,16 +57,6 @@
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 	return &nlru->lru;
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 }
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-static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
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-{
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-	struct page *page;
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-
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-	if (!memcg_kmem_enabled())
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-		return NULL;
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-	page = virt_to_head_page(ptr);
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-	return page->mem_cgroup;
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-}
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-
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 static inline struct list_lru_one *
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 list_lru_from_kmem(struct list_lru_node *nlru, void *ptr,
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 		   struct mem_cgroup **memcg_ptr)
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@@ -75,7 +67,7 @@
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 	if (!nlru->memcg_lrus)
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 		goto out;
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-	memcg = mem_cgroup_from_kmem(ptr);
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+	memcg = mem_cgroup_from_obj(ptr);
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 	if (!memcg)
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 		goto out;
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@@ -188,7 +180,7 @@
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 	rcu_read_lock();
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 	l = list_lru_from_memcg_idx(nlru, memcg_cache_id(memcg));
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-	count = l->nr_items;
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+	count = READ_ONCE(l->nr_items);
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 	rcu_read_unlock();
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 	return count;
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@@ -221,7 +213,7 @@
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 		/*
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 		 * decrement nr_to_walk first so that we don't livelock if we
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-		 * get stuck on large numbesr of LRU_RETRY items
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+		 * get stuck on large numbers of LRU_RETRY items
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 		 */
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 		if (!*nr_to_walk)
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 			break;
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@@ -231,7 +223,7 @@
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 		switch (ret) {
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 		case LRU_REMOVED_RETRY:
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 			assert_spin_locked(&nlru->lock);
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-			/* fall through */
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+			fallthrough;
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 		case LRU_REMOVED:
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 			isolated++;
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 			nlru->nr_items--;
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@@ -381,14 +373,14 @@
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 	struct list_lru_memcg *memcg_lrus;
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 	/*
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 	 * This is called when shrinker has already been unregistered,
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-	 * and nobody can use it. So, there is no need to use kvfree_rcu().
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+	 * and nobody can use it. So, there is no need to use kvfree_rcu_local().
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 	 */
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 	memcg_lrus = rcu_dereference_protected(nlru->memcg_lrus, true);
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 	__memcg_destroy_list_lru_node(memcg_lrus, 0, memcg_nr_cache_ids);
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 	kvfree(memcg_lrus);
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 }
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-static void kvfree_rcu(struct rcu_head *head)
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+static void kvfree_rcu_local(struct rcu_head *head)
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 {
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 	struct list_lru_memcg *mlru;
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@@ -427,7 +419,7 @@
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 	rcu_assign_pointer(nlru->memcg_lrus, new);
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 	spin_unlock_irq(&nlru->lock);
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-	call_rcu(&old->rcu, kvfree_rcu);
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+	call_rcu(&old->rcu, kvfree_rcu_local);
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 	return 0;
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 }
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@@ -599,7 +591,6 @@
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 		    struct lock_class_key *key, struct shrinker *shrinker)
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 {
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 	int i;
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-	size_t size = sizeof(*lru->node) * nr_node_ids;
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 	int err = -ENOMEM;
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 #ifdef CONFIG_MEMCG_KMEM
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@@ -610,7 +601,7 @@
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 #endif
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 	memcg_get_cache_ids();
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-	lru->node = kzalloc(size, GFP_KERNEL);
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+	lru->node = kcalloc(nr_node_ids, sizeof(*lru->node), GFP_KERNEL);
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 	if (!lru->node)
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 		goto out;
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