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authorFrederic Weisbecker <fweisbec@gmail.com>2012-04-25 01:11:35 +0200
committerTejun Heo <tj@kernel.org>2012-04-27 14:36:45 -0700
commit4d8438f044d8aaac6fbba98316ba484dabea397d (patch)
tree90c63abf93502bfecff1f098732c2f0a0d13c024 /kernel
parentc4c27fbdda4e8ba87806c415b6d15266b07bce4b (diff)
res_counter: Merge res_counter_charge and res_counter_charge_nofail
These two functions do almost the same thing and duplicate some code. Merge their implementation into a single common function. res_counter_charge_locked() takes one more parameter but it doesn't seem to be used outside res_counter.c yet anyway. There is no (intended) change in the behaviour. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Glauber Costa <glommer@parallels.com> Acked-by: Kirill A. Shutemov <kirill@shutemov.name> Cc: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/res_counter.c73
1 files changed, 34 insertions, 39 deletions
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index d508363858b3..07a29923aba2 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -22,75 +22,70 @@ void res_counter_init(struct res_counter *counter, struct res_counter *parent)
counter->parent = parent;
}
-int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
+int res_counter_charge_locked(struct res_counter *counter, unsigned long val,
+ bool force)
{
+ int ret = 0;
+
if (counter->usage + val > counter->limit) {
counter->failcnt++;
- return -ENOMEM;
+ ret = -ENOMEM;
+ if (!force)
+ return ret;
}
counter->usage += val;
- if (counter->usage > counter->max_usage)
+ if (!force && counter->usage > counter->max_usage)
counter->max_usage = counter->usage;
- return 0;
+ return ret;
}
-int res_counter_charge(struct res_counter *counter, unsigned long val,
- struct res_counter **limit_fail_at)
+static int __res_counter_charge(struct res_counter *counter, unsigned long val,
+ struct res_counter **limit_fail_at, bool force)
{
- int ret;
+ int ret, r;
unsigned long flags;
struct res_counter *c, *u;
+ r = ret = 0;
*limit_fail_at = NULL;
local_irq_save(flags);
for (c = counter; c != NULL; c = c->parent) {
spin_lock(&c->lock);
- ret = res_counter_charge_locked(c, val);
+ r = res_counter_charge_locked(c, val, force);
spin_unlock(&c->lock);
- if (ret < 0) {
+ if (r < 0 && !ret) {
+ ret = r;
*limit_fail_at = c;
- goto undo;
+ if (!force)
+ break;
}
}
- ret = 0;
- goto done;
-undo:
- for (u = counter; u != c; u = u->parent) {
- spin_lock(&u->lock);
- res_counter_uncharge_locked(u, val);
- spin_unlock(&u->lock);
+
+ if (ret < 0 && !force) {
+ for (u = counter; u != c; u = u->parent) {
+ spin_lock(&u->lock);
+ res_counter_uncharge_locked(u, val);
+ spin_unlock(&u->lock);
+ }
}
-done:
local_irq_restore(flags);
+
return ret;
}
+int res_counter_charge(struct res_counter *counter, unsigned long val,
+ struct res_counter **limit_fail_at)
+{
+ return __res_counter_charge(counter, val, limit_fail_at, false);
+}
+
int res_counter_charge_nofail(struct res_counter *counter, unsigned long val,
struct res_counter **limit_fail_at)
{
- int ret, r;
- unsigned long flags;
- struct res_counter *c;
-
- r = ret = 0;
- *limit_fail_at = NULL;
- local_irq_save(flags);
- for (c = counter; c != NULL; c = c->parent) {
- spin_lock(&c->lock);
- r = res_counter_charge_locked(c, val);
- if (r)
- c->usage += val;
- spin_unlock(&c->lock);
- if (r < 0 && ret == 0) {
- *limit_fail_at = c;
- ret = r;
- }
- }
- local_irq_restore(flags);
-
- return ret;
+ return __res_counter_charge(counter, val, limit_fail_at, true);
}
+
void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
{
if (WARN_ON(counter->usage < val))