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-rw-r--r--include/linux/rcupdate.h98
1 files changed, 71 insertions, 27 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 15fbb3ca634..95e0615f4d7 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -51,18 +51,26 @@ struct rcu_head {
void (*func)(struct rcu_head *head);
};
-/* Internal to kernel, but needed by rcupreempt.h. */
+/* Exported common interfaces */
+extern void synchronize_rcu(void);
+extern void synchronize_rcu_bh(void);
+extern void rcu_barrier(void);
+extern void rcu_barrier_bh(void);
+extern void rcu_barrier_sched(void);
+extern void synchronize_sched_expedited(void);
+extern int sched_expedited_torture_stats(char *page);
+
+/* Internal to kernel */
+extern void rcu_init(void);
+extern void rcu_scheduler_starting(void);
+extern int rcu_needs_cpu(int cpu);
extern int rcu_scheduler_active;
-#if defined(CONFIG_CLASSIC_RCU)
-#include <linux/rcuclassic.h>
-#elif defined(CONFIG_TREE_RCU)
+#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
#include <linux/rcutree.h>
-#elif defined(CONFIG_PREEMPT_RCU)
-#include <linux/rcupreempt.h>
#else
#error "Unknown RCU implementation specified to kernel configuration"
-#endif /* #else #if defined(CONFIG_CLASSIC_RCU) */
+#endif
#define RCU_HEAD_INIT { .next = NULL, .func = NULL }
#define RCU_HEAD(head) struct rcu_head head = RCU_HEAD_INIT
@@ -70,6 +78,16 @@ extern int rcu_scheduler_active;
(ptr)->next = NULL; (ptr)->func = NULL; \
} while (0)
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+extern struct lockdep_map rcu_lock_map;
+# define rcu_read_acquire() \
+ lock_acquire(&rcu_lock_map, 0, 0, 2, 1, NULL, _THIS_IP_)
+# define rcu_read_release() lock_release(&rcu_lock_map, 1, _THIS_IP_)
+#else
+# define rcu_read_acquire() do { } while (0)
+# define rcu_read_release() do { } while (0)
+#endif
+
/**
* rcu_read_lock - mark the beginning of an RCU read-side critical section.
*
@@ -99,7 +117,12 @@ extern int rcu_scheduler_active;
*
* It is illegal to block while in an RCU read-side critical section.
*/
-#define rcu_read_lock() __rcu_read_lock()
+static inline void rcu_read_lock(void)
+{
+ __rcu_read_lock();
+ __acquire(RCU);
+ rcu_read_acquire();
+}
/**
* rcu_read_unlock - marks the end of an RCU read-side critical section.
@@ -116,7 +139,12 @@ extern int rcu_scheduler_active;
* used as well. RCU does not care how the writers keep out of each
* others' way, as long as they do so.
*/
-#define rcu_read_unlock() __rcu_read_unlock()
+static inline void rcu_read_unlock(void)
+{
+ rcu_read_release();
+ __release(RCU);
+ __rcu_read_unlock();
+}
/**
* rcu_read_lock_bh - mark the beginning of a softirq-only RCU critical section
@@ -129,14 +157,24 @@ extern int rcu_scheduler_active;
* can use just rcu_read_lock().
*
*/
-#define rcu_read_lock_bh() __rcu_read_lock_bh()
+static inline void rcu_read_lock_bh(void)
+{
+ __rcu_read_lock_bh();
+ __acquire(RCU_BH);
+ rcu_read_acquire();
+}
/*
* rcu_read_unlock_bh - marks the end of a softirq-only RCU critical section
*
* See rcu_read_lock_bh() for more information.
*/
-#define rcu_read_unlock_bh() __rcu_read_unlock_bh()
+static inline void rcu_read_unlock_bh(void)
+{
+ rcu_read_release();
+ __release(RCU_BH);
+ __rcu_read_unlock_bh();
+}
/**
* rcu_read_lock_sched - mark the beginning of a RCU-classic critical section
@@ -147,17 +185,34 @@ extern int rcu_scheduler_active;
* - call_rcu_sched() and rcu_barrier_sched()
* on the write-side to insure proper synchronization.
*/
-#define rcu_read_lock_sched() preempt_disable()
-#define rcu_read_lock_sched_notrace() preempt_disable_notrace()
+static inline void rcu_read_lock_sched(void)
+{
+ preempt_disable();
+ __acquire(RCU_SCHED);
+ rcu_read_acquire();
+}
+static inline notrace void rcu_read_lock_sched_notrace(void)
+{
+ preempt_disable_notrace();
+ __acquire(RCU_SCHED);
+}
/*
* rcu_read_unlock_sched - marks the end of a RCU-classic critical section
*
* See rcu_read_lock_sched for more information.
*/
-#define rcu_read_unlock_sched() preempt_enable()
-#define rcu_read_unlock_sched_notrace() preempt_enable_notrace()
-
+static inline void rcu_read_unlock_sched(void)
+{
+ rcu_read_release();
+ __release(RCU_SCHED);
+ preempt_enable();
+}
+static inline notrace void rcu_read_unlock_sched_notrace(void)
+{
+ __release(RCU_SCHED);
+ preempt_enable_notrace();
+}
/**
@@ -259,15 +314,4 @@ extern void call_rcu(struct rcu_head *head,
extern void call_rcu_bh(struct rcu_head *head,
void (*func)(struct rcu_head *head));
-/* Exported common interfaces */
-extern void synchronize_rcu(void);
-extern void rcu_barrier(void);
-extern void rcu_barrier_bh(void);
-extern void rcu_barrier_sched(void);
-
-/* Internal to kernel */
-extern void rcu_init(void);
-extern void rcu_scheduler_starting(void);
-extern int rcu_needs_cpu(int cpu);
-
#endif /* __LINUX_RCUPDATE_H */