[patch 1/8] mm: memcg: remove unnecessary preemption disabling

[Johannes Weiner <hannes@cmpxchg.org>]

lock_page_cgroup() disables preemption, remove explicit preemption
disabling for code paths holding this lock.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/memcontrol.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 53385cd4e6f0..befb3dd9d46c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -921,8 +921,6 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
 					 struct page *page,
 					 bool anon, int nr_pages)
 {
-	preempt_disable();
-
 	/*
 	 * Here, RSS means 'mapped anon' and anon's SwapCache. Shmem/tmpfs is
 	 * counted as CACHE even if it's on ANON LRU.
@@ -947,8 +945,6 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
 	}
 
 	__this_cpu_add(memcg->stat->nr_page_events, nr_pages);
-
-	preempt_enable();
 }
 
 unsigned long
@@ -3780,17 +3776,14 @@ void mem_cgroup_split_huge_fixup(struct page *head)
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
-static inline
-void mem_cgroup_move_account_page_stat(struct mem_cgroup *from,
-					struct mem_cgroup *to,
-					unsigned int nr_pages,
-					enum mem_cgroup_stat_index idx)
+static void mem_cgroup_move_account_page_stat(struct mem_cgroup *from,
+					      struct mem_cgroup *to,
+					      unsigned int nr_pages,
+					      enum mem_cgroup_stat_index idx)
 {
 	/* Update stat data for mem_cgroup */
-	preempt_disable();
 	__this_cpu_sub(from->stat->count[idx], nr_pages);
 	__this_cpu_add(to->stat->count[idx], nr_pages);
-	preempt_enable();
 }
 
 /**
-- 
1.8.5.3

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