atomic: use <linux/atomic.h>

[mirror_ubuntu-zesty-kernel.git] / include / linux / atomic.h

diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index bc6615d4132b288213a65843f7a65e6c1be6e1bf..66fed6364122b2f47b78b1cd5fef0fd2f1f53b33 100644 (file)
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -2,6 +2,15 @@
 #define _LINUX_ATOMIC_H
 #include <asm/atomic.h>
 
+/**
+ * atomic_inc_not_zero - increment unless the number is zero
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1, so long as @v is non-zero.
+ * Returns non-zero if @v was non-zero, and zero otherwise.
+ */
+#define atomic_inc_not_zero(v)         atomic_add_unless((v), 1, 0)
+
 /**
  * atomic_inc_not_zero_hint - increment if not null
  * @v: pointer of type atomic_t