mm: memcontrol: inline memcg->move_lock locking

The wrappers around taking and dropping the memcg->move_lock spinlock add
nothing of value.  Inline the spinlock calls into the callsites.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 22 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 09fece0eb9f1..a5c9aa4688e8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1522,23 +1522,6 @@ static bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg)
         return false;
 }
 
-/*
- * Take this lock when
- * - a code tries to modify page's memcg while it's USED.
- * - a code tries to modify page state accounting in a memcg.
- */
-static void move_lock_mem_cgroup(struct mem_cgroup *memcg,
-                                  unsigned long *flags)
-{
-        spin_lock_irqsave(&memcg->move_lock, *flags);
-}
-
-static void move_unlock_mem_cgroup(struct mem_cgroup *memcg,
-                                unsigned long *flags)
-{
-        spin_unlock_irqrestore(&memcg->move_lock, *flags);
-}
-
 #define K(x) ((x) << (PAGE_SHIFT-10))
 /**
  * mem_cgroup_print_oom_info: Print OOM information relevant to memory controller.
@@ -2156,9 +2139,9 @@ again:
         if (atomic_read(&memcg->moving_account) <= 0)
                 return memcg;
 
-        move_lock_mem_cgroup(memcg, flags);
+        spin_lock_irqsave(&memcg->move_lock, *flags);
         if (memcg != pc->mem_cgroup) {
-                move_unlock_mem_cgroup(memcg, flags);
+                spin_unlock_irqrestore(&memcg->move_lock, *flags);
                 goto again;
         }
         *locked = true;
@@ -2176,7 +2159,7 @@ void mem_cgroup_end_page_stat(struct mem_cgroup *memcg, bool locked,
                               unsigned long flags)
 {
         if (memcg && locked)
-                move_unlock_mem_cgroup(memcg, &flags);
+                spin_unlock_irqrestore(&memcg->move_lock, flags);
 
         rcu_read_unlock();
 }
@@ -3219,7 +3202,7 @@ static int mem_cgroup_move_account(struct page *page,
         if (pc->mem_cgroup != from)
                 goto out_unlock;
 
-        move_lock_mem_cgroup(from, &flags);
+        spin_lock_irqsave(&from->move_lock, flags);
 
         if (!PageAnon(page) && page_mapped(page)) {
                 __this_cpu_sub(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED],
@@ -3243,7 +3226,8 @@ static int mem_cgroup_move_account(struct page *page,
 
         /* caller should have done css_get */
         pc->mem_cgroup = to;
-        move_unlock_mem_cgroup(from, &flags);
+        spin_unlock_irqrestore(&from->move_lock, flags);
+
         ret = 0;
 
         local_irq_disable();