mm: memcontrol: use int for event/state parameter in several functions

Several functions use an enum type as parameter for an event/state, but
are called in some locations with an argument of a different enum type.
Adjust the interface of these functions to reality by changing the
parameter to int.

This fixes a ton of enum-conversion warnings that are generated when
building the kernel with clang.

[mka@chromium.org: also change parameter type of inc/dec/mod_memcg_page_state()]
Link: http://lkml.kernel.org/r/20170728213442.93823-1-mka@chromium.org
Link: http://lkml.kernel.org/r/20170727211004.34435-1-mka@chromium.org
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Doug Anderson <dianders@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 9b15a4b..69966c4 100644 (file)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -488,8 +488,9 @@ struct mem_cgroup *lock_page_memcg(struct page *page);
 void __unlock_page_memcg(struct mem_cgroup *memcg);
 void unlock_page_memcg(struct page *page);
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
-                                            enum memcg_stat_item idx)
+                                            int idx)
 {
        long val = 0;
        int cpu;
@@ -503,15 +504,17 @@ static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
        return val;
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void __mod_memcg_state(struct mem_cgroup *memcg,
-                                    enum memcg_stat_item idx, int val)
+                                    int idx, int val)
 {
        if (!mem_cgroup_disabled())
                __this_cpu_add(memcg->stat->count[idx], val);
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void mod_memcg_state(struct mem_cgroup *memcg,
-                                  enum memcg_stat_item idx, int val)
+                                  int idx, int val)
 {
        if (!mem_cgroup_disabled())
                this_cpu_add(memcg->stat->count[idx], val);
@@ -535,14 +538,14 @@ static inline void mod_memcg_state(struct mem_cgroup *memcg,
  * Kernel pages are an exception to this, since they'll never move.
  */
 static inline void __mod_memcg_page_state(struct page *page,
-                                         enum memcg_stat_item idx, int val)
+                                         int idx, int val)
 {
        if (page->mem_cgroup)
                __mod_memcg_state(page->mem_cgroup, idx, val);
 }
 
 static inline void mod_memcg_page_state(struct page *page,
-                                       enum memcg_stat_item idx, int val)
+                                       int idx, int val)
 {
        if (page->mem_cgroup)
                mod_memcg_state(page->mem_cgroup, idx, val);
@@ -632,8 +635,9 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
                this_cpu_add(memcg->stat->events[idx], count);
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void count_memcg_page_event(struct page *page,
-                                         enum memcg_stat_item idx)
+                                         int idx)
 {
        if (page->mem_cgroup)
                count_memcg_events(page->mem_cgroup, idx, 1);
@@ -846,31 +850,31 @@ static inline bool mem_cgroup_oom_synchronize(bool wait)
 }
 
 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
-                                            enum memcg_stat_item idx)
+                                            int idx)
 {
        return 0;
 }
 
 static inline void __mod_memcg_state(struct mem_cgroup *memcg,
-                                    enum memcg_stat_item idx,
+                                    int idx,
                                     int nr)
 {
 }
 
 static inline void mod_memcg_state(struct mem_cgroup *memcg,
-                                  enum memcg_stat_item idx,
+                                  int idx,
                                   int nr)
 {
 }
 
 static inline void __mod_memcg_page_state(struct page *page,
-                                         enum memcg_stat_item idx,
+                                         int idx,
                                          int nr)
 {
 }
 
 static inline void mod_memcg_page_state(struct page *page,
-                                       enum memcg_stat_item idx,
+                                       int idx,
                                        int nr)
 {
 }
@@ -924,7 +928,7 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
 }
 
 static inline void count_memcg_page_event(struct page *page,
-                                         enum memcg_stat_item idx)
+                                         int idx)
 {
 }
 
@@ -934,26 +938,30 @@ void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
 }
 #endif /* CONFIG_MEMCG */
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void __inc_memcg_state(struct mem_cgroup *memcg,
-                                    enum memcg_stat_item idx)
+                                    int idx)
 {
        __mod_memcg_state(memcg, idx, 1);
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void __dec_memcg_state(struct mem_cgroup *memcg,
-                                    enum memcg_stat_item idx)
+                                    int idx)
 {
        __mod_memcg_state(memcg, idx, -1);
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void __inc_memcg_page_state(struct page *page,
-                                         enum memcg_stat_item idx)
+                                         int idx)
 {
        __mod_memcg_page_state(page, idx, 1);
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void __dec_memcg_page_state(struct page *page,
-                                         enum memcg_stat_item idx)
+                                         int idx)
 {
        __mod_memcg_page_state(page, idx, -1);
 }
@@ -982,26 +990,30 @@ static inline void __dec_lruvec_page_state(struct page *page,
        __mod_lruvec_page_state(page, idx, -1);
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void inc_memcg_state(struct mem_cgroup *memcg,
-                                  enum memcg_stat_item idx)
+                                  int idx)
 {
        mod_memcg_state(memcg, idx, 1);
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void dec_memcg_state(struct mem_cgroup *memcg,
-                                  enum memcg_stat_item idx)
+                                  int idx)
 {
        mod_memcg_state(memcg, idx, -1);
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void inc_memcg_page_state(struct page *page,
-                                       enum memcg_stat_item idx)
+                                       int idx)
 {
        mod_memcg_page_state(page, idx, 1);
 }
 
+/* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void dec_memcg_page_state(struct page *page,
-                                       enum memcg_stat_item idx)
+                                       int idx)
 {
        mod_memcg_page_state(page, idx, -1);
 }

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2926c44..3d3f7b1 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -550,10 +550,12 @@ mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
  * value, and reading all cpu value can be performance bottleneck in some
  * common workload, threshold and synchronization as vmstat[] should be
  * implemented.
+ *
+ * The parameter idx can be of type enum memcg_event_item or vm_event_item.
  */
 
 static unsigned long memcg_sum_events(struct mem_cgroup *memcg,
-                                     enum memcg_event_item event)
+                                     int event)
 {
        unsigned long val = 0;
        int cpu;