Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: [PATCH 05/10] list_lru: Add memcg argument to list_lru_from_kmem()
From:   Kirill Tkhai <ktkhai@virtuozzo.com>
To:     viro@zeniv.linux.org.uk, hannes@cmpxchg.org, mhocko@kernel.org,
        vdavydov.dev@gmail.com, ktkhai@virtuozzo.com,
        akpm@linux-foundation.org, tglx@linutronix.de,
        pombredanne@nexb.com, stummala@codeaurora.org,
        gregkh@linuxfoundation.org, sfr@canb.auug.org.au, guro@fb.com,
        mka@chromium.org, penguin-kernel@I-love.SAKURA.ne.jp,
        chris@chris-wilson.co.uk, longman@redhat.com, minchan@kernel.org,
        hillf.zj@alibaba-inc.com, ying.huang@intel.com,
        mgorman@techsingularity.net, shakeelb@google.com, jbacik@fb.com,
        linux@roeck-us.net, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, willy@infradead.org
Date:   Wed, 21 Mar 2018 16:22:02 +0300
Message-ID: <152163852218.21546.1527059404040591309.stgit@localhost.localdomain>
In-Reply-To: <152163840790.21546.980703278415599202.stgit@localhost.localdomain>
References: <152163840790.21546.980703278415599202.stgit@localhost.localdomain>
User-Agent: StGit/0.18
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Received-SPF: None (protection.outlook.com: virtuozzo.com does not designate
 permitted sender hosts)
SpamDiagnosticOutput: 1:99
SpamDiagnosticMetadata: NSPM
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Mar 2018 13:22:04.4296 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: fe223793-7f9b-4258-8e86-08d58f2ebd6f
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f
X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0801MB1340
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

This is just refactoring to allow next patches to have
memcg pointer in list_lru_from_kmem().

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
 mm/list_lru.c |   24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/mm/list_lru.c b/mm/list_lru.c
index 013bf04a9eb9..78a3943190d4 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -76,18 +76,24 @@ static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
 }
 
 static inline struct list_lru_one *
-list_lru_from_kmem(struct list_lru_node *nlru, void *ptr)
+list_lru_from_kmem(struct list_lru_node *nlru, void *ptr,
+		   struct mem_cgroup **memcg_ptr)
 {
-	struct mem_cgroup *memcg;
+	struct list_lru_one *l = &nlru->lru;
+	struct mem_cgroup *memcg = NULL;
 
 	if (!nlru->memcg_lrus)
-		return &nlru->lru;
+		goto out;
 
 	memcg = mem_cgroup_from_kmem(ptr);
 	if (!memcg)
-		return &nlru->lru;
+		goto out;
 
-	return list_lru_from_memcg_idx(nlru, memcg_cache_id(memcg));
+	l = list_lru_from_memcg_idx(nlru, memcg_cache_id(memcg));
+out:
+	if (memcg_ptr)
+		*memcg_ptr = memcg;
+	return l;
 }
 #else
 static inline bool list_lru_memcg_aware(struct list_lru *lru)
@@ -102,8 +108,10 @@ list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx)
 }
 
 static inline struct list_lru_one *
-list_lru_from_kmem(struct list_lru_node *nlru, void *ptr)
+list_lru_from_kmem(struct list_lru_node *nlru, void *ptr,
+		   struct mem_cgroup **memcg_ptr)
 {
+	*memcg_ptr = NULL;
 	return &nlru->lru;
 }
 #endif /* CONFIG_MEMCG && !CONFIG_SLOB */
@@ -116,7 +124,7 @@ bool list_lru_add(struct list_lru *lru, struct list_head *item)
 
 	spin_lock(&nlru->lock);
 	if (list_empty(item)) {
-		l = list_lru_from_kmem(nlru, item);
+		l = list_lru_from_kmem(nlru, item, NULL);
 		list_add_tail(item, &l->list);
 		l->nr_items++;
 		nlru->nr_items++;
@@ -142,7 +150,7 @@ bool list_lru_del(struct list_lru *lru, struct list_head *item)
 
 	spin_lock(&nlru->lock);
 	if (!list_empty(item)) {
-		l = list_lru_from_kmem(nlru, item);
+		l = list_lru_from_kmem(nlru, item, NULL);
 		list_del_init(item);
 		l->nr_items--;
 		nlru->nr_items--;