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-rw-r--r--include/linux/srcu.h84
1 files changed, 12 insertions, 72 deletions
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index a598cf3ac70c..167ad8831aaf 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -22,7 +22,7 @@
* Lai Jiangshan <laijs@cn.fujitsu.com>
*
* For detailed explanation of Read-Copy Update mechanism see -
- * Documentation/RCU/ *.txt
+ * Documentation/RCU/ *.txt
*
*/
@@ -32,35 +32,9 @@
#include <linux/mutex.h>
#include <linux/rcupdate.h>
#include <linux/workqueue.h>
+#include <linux/rcu_segcblist.h>
-struct srcu_array {
- unsigned long lock_count[2];
- unsigned long unlock_count[2];
-};
-
-struct rcu_batch {
- struct rcu_head *head, **tail;
-};
-
-#define RCU_BATCH_INIT(name) { NULL, &(name.head) }
-
-struct srcu_struct {
- unsigned long completed;
- struct srcu_array __percpu *per_cpu_ref;
- spinlock_t queue_lock; /* protect ->batch_queue, ->running */
- bool running;
- /* callbacks just queued */
- struct rcu_batch batch_queue;
- /* callbacks try to do the first check_zero */
- struct rcu_batch batch_check0;
- /* callbacks done with the first check_zero and the flip */
- struct rcu_batch batch_check1;
- struct rcu_batch batch_done;
- struct delayed_work work;
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
- struct lockdep_map dep_map;
-#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
-};
+struct srcu_struct;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
@@ -82,46 +56,15 @@ int init_srcu_struct(struct srcu_struct *sp);
#define __SRCU_DEP_MAP_INIT(srcu_name)
#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
-void process_srcu(struct work_struct *work);
-
-#define __SRCU_STRUCT_INIT(name) \
- { \
- .completed = -300, \
- .per_cpu_ref = &name##_srcu_array, \
- .queue_lock = __SPIN_LOCK_UNLOCKED(name.queue_lock), \
- .running = false, \
- .batch_queue = RCU_BATCH_INIT(name.batch_queue), \
- .batch_check0 = RCU_BATCH_INIT(name.batch_check0), \
- .batch_check1 = RCU_BATCH_INIT(name.batch_check1), \
- .batch_done = RCU_BATCH_INIT(name.batch_done), \
- .work = __DELAYED_WORK_INITIALIZER(name.work, process_srcu, 0),\
- __SRCU_DEP_MAP_INIT(name) \
- }
-
-/*
- * Define and initialize a srcu struct at build time.
- * Do -not- call init_srcu_struct() nor cleanup_srcu_struct() on it.
- *
- * Note that although DEFINE_STATIC_SRCU() hides the name from other
- * files, the per-CPU variable rules nevertheless require that the
- * chosen name be globally unique. These rules also prohibit use of
- * DEFINE_STATIC_SRCU() within a function. If these rules are too
- * restrictive, declare the srcu_struct manually. For example, in
- * each file:
- *
- * static struct srcu_struct my_srcu;
- *
- * Then, before the first use of each my_srcu, manually initialize it:
- *
- * init_srcu_struct(&my_srcu);
- *
- * See include/linux/percpu-defs.h for the rules on per-CPU variables.
- */
-#define __DEFINE_SRCU(name, is_static) \
- static DEFINE_PER_CPU(struct srcu_array, name##_srcu_array);\
- is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name)
-#define DEFINE_SRCU(name) __DEFINE_SRCU(name, /* not static */)
-#define DEFINE_STATIC_SRCU(name) __DEFINE_SRCU(name, static)
+#ifdef CONFIG_TINY_SRCU
+#include <linux/srcutiny.h>
+#elif defined(CONFIG_TREE_SRCU)
+#include <linux/srcutree.h>
+#elif defined(CONFIG_CLASSIC_SRCU)
+#include <linux/srcuclassic.h>
+#else
+#error "Unknown SRCU implementation specified to kernel configuration"
+#endif
/**
* call_srcu() - Queue a callback for invocation after an SRCU grace period
@@ -147,9 +90,6 @@ void cleanup_srcu_struct(struct srcu_struct *sp);
int __srcu_read_lock(struct srcu_struct *sp) __acquires(sp);
void __srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);
void synchronize_srcu(struct srcu_struct *sp);
-void synchronize_srcu_expedited(struct srcu_struct *sp);
-unsigned long srcu_batches_completed(struct srcu_struct *sp);
-void srcu_barrier(struct srcu_struct *sp);
#ifdef CONFIG_DEBUG_LOCK_ALLOC