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-rw-r--r--include/linux/percpu_counter.h38
1 files changed, 20 insertions, 18 deletions
diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h
index 66b5de404f2..f5aa593ccf3 100644
--- a/include/linux/percpu_counter.h
+++ b/include/linux/percpu_counter.h
@@ -10,13 +10,14 @@
#include <linux/smp.h>
#include <linux/threads.h>
#include <linux/percpu.h>
+#include <linux/types.h>
#ifdef CONFIG_SMP
struct percpu_counter {
spinlock_t lock;
- long count;
- long *counters;
+ s64 count;
+ s32 *counters;
};
#if NR_CPUS >= 16
@@ -25,11 +26,11 @@ struct percpu_counter {
#define FBC_BATCH (NR_CPUS*4)
#endif
-static inline void percpu_counter_init(struct percpu_counter *fbc)
+static inline void percpu_counter_init(struct percpu_counter *fbc, s64 amount)
{
spin_lock_init(&fbc->lock);
- fbc->count = 0;
- fbc->counters = alloc_percpu(long);
+ fbc->count = amount;
+ fbc->counters = alloc_percpu(s32);
}
static inline void percpu_counter_destroy(struct percpu_counter *fbc)
@@ -37,10 +38,10 @@ static inline void percpu_counter_destroy(struct percpu_counter *fbc)
free_percpu(fbc->counters);
}
-void percpu_counter_mod(struct percpu_counter *fbc, long amount);
-long percpu_counter_sum(struct percpu_counter *fbc);
+void percpu_counter_mod(struct percpu_counter *fbc, s32 amount);
+s64 percpu_counter_sum(struct percpu_counter *fbc);
-static inline long percpu_counter_read(struct percpu_counter *fbc)
+static inline s64 percpu_counter_read(struct percpu_counter *fbc)
{
return fbc->count;
}
@@ -48,13 +49,14 @@ static inline long percpu_counter_read(struct percpu_counter *fbc)
/*
* It is possible for the percpu_counter_read() to return a small negative
* number for some counter which should never be negative.
+ *
*/
-static inline long percpu_counter_read_positive(struct percpu_counter *fbc)
+static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
{
- long ret = fbc->count;
+ s64 ret = fbc->count;
barrier(); /* Prevent reloads of fbc->count */
- if (ret > 0)
+ if (ret >= 0)
return ret;
return 1;
}
@@ -62,12 +64,12 @@ static inline long percpu_counter_read_positive(struct percpu_counter *fbc)
#else
struct percpu_counter {
- long count;
+ s64 count;
};
-static inline void percpu_counter_init(struct percpu_counter *fbc)
+static inline void percpu_counter_init(struct percpu_counter *fbc, s64 amount)
{
- fbc->count = 0;
+ fbc->count = amount;
}
static inline void percpu_counter_destroy(struct percpu_counter *fbc)
@@ -75,24 +77,24 @@ static inline void percpu_counter_destroy(struct percpu_counter *fbc)
}
static inline void
-percpu_counter_mod(struct percpu_counter *fbc, long amount)
+percpu_counter_mod(struct percpu_counter *fbc, s32 amount)
{
preempt_disable();
fbc->count += amount;
preempt_enable();
}
-static inline long percpu_counter_read(struct percpu_counter *fbc)
+static inline s64 percpu_counter_read(struct percpu_counter *fbc)
{
return fbc->count;
}
-static inline long percpu_counter_read_positive(struct percpu_counter *fbc)
+static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
{
return fbc->count;
}
-static inline long percpu_counter_sum(struct percpu_counter *fbc)
+static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
{
return percpu_counter_read_positive(fbc);
}