[PATCH v6 03/29] memcg: change defines to an enum

Glauber Costa
2012-11-01T12:15:12Z

This is just a cleanup patch for clarity of expression. In earlier
submissions, people asked it to be in a separate patch, so here it is.

[ v2: use named enum as type throughout the file as well ]

Signed-off-by: Glauber Costa <glommer@parallels.com>
Acked-by: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: David Rientjes <rientjes@google.com>
CC: Tejun Heo <tj@kernel.org>
---
mm/memcontrol.c | 26 ++++++++++++++++----------
1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index aa0d9b0..e3338c7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -386,9 +386,12 @@ enum charge_type {
};

/* for encoding cft->private value on file */
-#define _MEM (0)
-#define _MEMSWAP (1)
-#define _OOM_TYPE (2)
+enum res_type {
+ _MEM,
+ _MEMSWAP,
+ _OOM_TYPE,
+};
+
#define MEMFILE_PRIVATE(x, val) ((x) << 16 | (val))
#define MEMFILE_TYPE(val) ((val) >> 16 & 0xffff)
#define MEMFILE_ATTR(val) ((val) & 0xffff)
@@ -3915,7 +3918,8 @@ static ssize_t mem_cgroup_read(struct cgroup *cont, struct cftype *cft,
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
char str[64];
u64 val;
- int type, name, len;
+ int name, len;
+ enum res_type type;

type = MEMFILE_TYPE(cft->private);
name = MEMFILE_ATTR(cft->private);
@@ -3951,7 +3955,8 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
const char *buffer)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
- int type, name;
+ enum res_type type;
+ int name;
unsigned long long val;
int ret;

@@ -4027,7 +4032,8 @@ out:
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
- int type, name;
+ int name;
+ enum res_type type;

type = MEMFILE_TYPE(event);
name = MEMFILE_ATTR(event);
@@ -4363,7 +4369,7 @@ static int mem_cgroup_usage_register_event(struct cgroup *cgrp,
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
struct mem_cgroup_thresholds *thresholds;
struct mem_cgroup_threshold_ary *new;
- int type = MEMFILE_TYPE(cft->private);
+ enum res_type type = MEMFILE_TYPE(cft->private);
u64 threshold, usage;
int i, size, ret;

@@ -4446,7 +4452,7 @@ static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp,
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
struct mem_cgroup_thresholds *thresholds;
struct mem_cgroup_threshold_ary *new;
- int type = MEMFILE_TYPE(cft->private);
+ enum res_type type = MEMFILE_TYPE(cft->private);
u64 usage;
int i, j, size;

@@ -4524,7 +4530,7 @@ static int mem_cgroup_oom_register_event(struct cgroup *cgrp,
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
struct mem_cgroup_eventfd_list *event;
- int type = MEMFILE_TYPE(cft->private);
+ enum res_type type = MEMFILE_TYPE(cft->private);

BUG_ON(type != _OOM_TYPE);
event = kmalloc(sizeof(*event), GFP_KERNEL);
@@ -4549,7 +4555,7 @@ static void mem_cgroup_oom_unregister_event(struct cgroup *cgrp,
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
struct mem_cgroup_eventfd_list *ev, *tmp;
- int type = MEMFILE_TYPE(cft->private);
+ enum res_type type = MEMFILE_TYPE(cft->private);

BUG_ON(type != _OOM_TYPE);

--
1.7.11.7