percpu_ref: add PERCPU_REF_INIT_* flags

[pandora-kernel.git] / include / linux / percpu-refcount.h

diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index cd7e20f..b0293f2 100644 (file)
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -63,6 +63,21 @@ enum {
        __PERCPU_REF_FLAG_BITS  = 2,
 };
 
+/* @flags for percpu_ref_init() */
+enum {
+       /*
+        * Start w/ ref == 1 in atomic mode.  Can be switched to percpu
+        * operation using percpu_ref_switch_to_percpu().
+        */
+       PERCPU_REF_INIT_ATOMIC  = 1 << 0,
+
+       /*
+        * Start dead w/ ref == 0 in atomic mode.  Must be revived with
+        * percpu_ref_reinit() before used.  Implies INIT_ATOMIC.
+        */
+       PERCPU_REF_INIT_DEAD    = 1 << 1,
+};
+
 struct percpu_ref {
        atomic_long_t           count;
        /*
@@ -76,7 +91,8 @@ struct percpu_ref {
 };
 
 int __must_check percpu_ref_init(struct percpu_ref *ref,
-                                percpu_ref_func_t *release, gfp_t gfp);
+                                percpu_ref_func_t *release, unsigned int flags,
+                                gfp_t gfp);
 void percpu_ref_exit(struct percpu_ref *ref);
 void percpu_ref_switch_to_atomic(struct percpu_ref *ref,
                                 percpu_ref_func_t *confirm_switch);