diff options
Diffstat (limited to 'include/linux/percpu_counter.h')
| -rw-r--r-- | include/linux/percpu_counter.h | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h index c88d67b5939..d5dd4657c8d 100644 --- a/include/linux/percpu_counter.h +++ b/include/linux/percpu_counter.h @@ -16,7 +16,7 @@ #ifdef CONFIG_SMP struct percpu_counter { - spinlock_t lock; + raw_spinlock_t lock; s64 count; #ifdef CONFIG_HOTPLUG_CPU struct list_head list; /* All percpu_counters are on a list */ @@ -40,6 +40,7 @@ void percpu_counter_destroy(struct percpu_counter *fbc); void percpu_counter_set(struct percpu_counter *fbc, s64 amount); void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch); s64 __percpu_counter_sum(struct percpu_counter *fbc); +int percpu_counter_compare(struct percpu_counter *fbc, s64 rhs); static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount) { @@ -74,10 +75,15 @@ static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc) barrier(); /* Prevent reloads of fbc->count */ if (ret >= 0) return ret; - return 1; + return 0; } -#else +static inline int percpu_counter_initialized(struct percpu_counter *fbc) +{ + return (fbc->counters != NULL); +} + +#else /* !CONFIG_SMP */ struct percpu_counter { s64 count; @@ -98,6 +104,16 @@ static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount) fbc->count = amount; } +static inline int percpu_counter_compare(struct percpu_counter *fbc, s64 rhs) +{ + if (fbc->count > rhs) + return 1; + else if (fbc->count < rhs) + return -1; + else + return 0; +} + static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount) { @@ -117,6 +133,10 @@ static inline s64 percpu_counter_read(struct percpu_counter *fbc) return fbc->count; } +/* + * percpu_counter is intended to track positive numbers. In the UP case the + * number should never be negative. + */ static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc) { return fbc->count; @@ -132,6 +152,11 @@ static inline s64 percpu_counter_sum(struct percpu_counter *fbc) return percpu_counter_read(fbc); } +static inline int percpu_counter_initialized(struct percpu_counter *fbc) +{ + return 1; +} + #endif /* CONFIG_SMP */ static inline void percpu_counter_inc(struct percpu_counter *fbc) |