diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-01-16 17:46:22 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-01-16 17:46:22 +0100 |
commit | 5a2dd72abdae75ea2960145e0549635ce4e0be96 (patch) | |
tree | 44dba0119c75679a17215200f92ab23bdde9efc2 /kernel/res_counter.c | |
parent | efdc64f0c792ea744bcc9203f35b908e66d42f41 (diff) | |
parent | 7cb36b6ccdca03bd87e8faca7fd920643dd1aec7 (diff) |
Merge branch 'linus' into irq/genirq
Diffstat (limited to 'kernel/res_counter.c')
-rw-r--r-- | kernel/res_counter.c | 44 |
1 files changed, 35 insertions, 9 deletions
diff --git a/kernel/res_counter.c b/kernel/res_counter.c index f275c8eca77..bf8e7534c80 100644 --- a/kernel/res_counter.c +++ b/kernel/res_counter.c @@ -15,10 +15,11 @@ #include <linux/uaccess.h> #include <linux/mm.h> -void res_counter_init(struct res_counter *counter) +void res_counter_init(struct res_counter *counter, struct res_counter *parent) { spin_lock_init(&counter->lock); counter->limit = (unsigned long long)LLONG_MAX; + counter->parent = parent; } int res_counter_charge_locked(struct res_counter *counter, unsigned long val) @@ -34,14 +35,34 @@ int res_counter_charge_locked(struct res_counter *counter, unsigned long val) return 0; } -int res_counter_charge(struct res_counter *counter, unsigned long val) +int res_counter_charge(struct res_counter *counter, unsigned long val, + struct res_counter **limit_fail_at) { int ret; unsigned long flags; - - spin_lock_irqsave(&counter->lock, flags); - ret = res_counter_charge_locked(counter, val); - spin_unlock_irqrestore(&counter->lock, flags); + struct res_counter *c, *u; + + *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); + spin_unlock(&c->lock); + if (ret < 0) { + *limit_fail_at = c; + goto undo; + } + } + 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); + } +done: + local_irq_restore(flags); return ret; } @@ -56,10 +77,15 @@ void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val) void res_counter_uncharge(struct res_counter *counter, unsigned long val) { unsigned long flags; + struct res_counter *c; - spin_lock_irqsave(&counter->lock, flags); - res_counter_uncharge_locked(counter, val); - spin_unlock_irqrestore(&counter->lock, flags); + local_irq_save(flags); + for (c = counter; c != NULL; c = c->parent) { + spin_lock(&c->lock); + res_counter_uncharge_locked(c, val); + spin_unlock(&c->lock); + } + local_irq_restore(flags); } |