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Diffstat (limited to 'include/linux/percpu-refcount.h')
-rw-r--r--include/linux/percpu-refcount.h26
1 files changed, 21 insertions, 5 deletions
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index 390031e816dc..22d9d183950d 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -210,15 +210,17 @@ static inline void percpu_ref_get(struct percpu_ref *ref)
}
/**
- * percpu_ref_tryget - try to increment a percpu refcount
+ * percpu_ref_tryget_many - try to increment a percpu refcount
* @ref: percpu_ref to try-get
+ * @nr: number of references to get
*
- * Increment a percpu refcount unless its count already reached zero.
+ * Increment a percpu refcount by @nr unless its count already reached zero.
* Returns %true on success; %false on failure.
*
* This function is safe to call as long as @ref is between init and exit.
*/
-static inline bool percpu_ref_tryget(struct percpu_ref *ref)
+static inline bool percpu_ref_tryget_many(struct percpu_ref *ref,
+ unsigned long nr)
{
unsigned long __percpu *percpu_count;
bool ret;
@@ -226,10 +228,10 @@ static inline bool percpu_ref_tryget(struct percpu_ref *ref)
rcu_read_lock();
if (__ref_is_percpu(ref, &percpu_count)) {
- this_cpu_inc(*percpu_count);
+ this_cpu_add(*percpu_count, nr);
ret = true;
} else {
- ret = atomic_long_inc_not_zero(&ref->count);
+ ret = atomic_long_add_unless(&ref->count, nr, 0);
}
rcu_read_unlock();
@@ -238,6 +240,20 @@ static inline bool percpu_ref_tryget(struct percpu_ref *ref)
}
/**
+ * percpu_ref_tryget - try to increment a percpu refcount
+ * @ref: percpu_ref to try-get
+ *
+ * Increment a percpu refcount unless its count already reached zero.
+ * Returns %true on success; %false on failure.
+ *
+ * This function is safe to call as long as @ref is between init and exit.
+ */
+static inline bool percpu_ref_tryget(struct percpu_ref *ref)
+{
+ return percpu_ref_tryget_many(ref, 1);
+}
+
+/**
* percpu_ref_tryget_live - try to increment a live percpu refcount
* @ref: percpu_ref to try-get
*