diff options
Diffstat (limited to 'include/linux/percpu_counter.h')
| -rw-r--r-- | include/linux/percpu_counter.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h index 46f6ba56fa9..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 */ @@ -75,7 +75,7 @@ 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; } static inline int percpu_counter_initialized(struct percpu_counter *fbc) @@ -83,7 +83,7 @@ static inline int percpu_counter_initialized(struct percpu_counter *fbc) return (fbc->counters != NULL); } -#else +#else /* !CONFIG_SMP */ struct percpu_counter { s64 count; @@ -133,6 +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; |