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Subject[PATCH] mm: memcontrol: Use int for event/state parameter in several functions
Date
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.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
include/linux/memcontrol.h | 20 ++++++++++++--------
mm/memcontrol.c | 4 +++-
2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 3914e3dd6168..80edbc04361e 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -487,8 +487,9 @@ extern int do_swap_account;
void lock_page_memcg(struct page *page);
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;
@@ -502,15 +503,17 @@ 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);
@@ -631,8 +634,9 @@ 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);
@@ -840,19 +844,19 @@ 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)
{
}
@@ -918,7 +922,7 @@ 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)
{
}

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3df3c04d73ab..460130d2a796 100644
--- 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;
--
2.14.0.rc0.400.g1c36432dff-goog
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