percpu_ref: make INIT_ATOMIC and switch_to_atomic() sticky

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

diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index b0293f2..00c01fc 100644 (file)
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -67,7 +67,9 @@ enum {
 enum {
        /*
         * Start w/ ref == 1 in atomic mode.  Can be switched to percpu
-        * operation using percpu_ref_switch_to_percpu().
+        * operation using percpu_ref_switch_to_percpu().  If initialized
+        * with this flag, the ref will stay in atomic mode until
+        * percpu_ref_switch_to_percpu() is invoked on it.
         */
        PERCPU_REF_INIT_ATOMIC  = 1 << 0,
 
@@ -87,6 +89,7 @@ struct percpu_ref {
        unsigned long           percpu_count_ptr;
        percpu_ref_func_t       *release;
        percpu_ref_func_t       *confirm_switch;
+       bool                    force_atomic:1;
        struct rcu_head         rcu;
 };