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-rw-r--r--include/linux/rcupdate.h30
1 files changed, 14 insertions, 16 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 2657aff2725b..5f1533e3d032 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -508,14 +508,7 @@ int rcu_read_lock_bh_held(void);
* CONFIG_DEBUG_LOCK_ALLOC, this assumes we are in an RCU-sched read-side
* critical section unless it can prove otherwise.
*/
-#ifdef CONFIG_PREEMPT_COUNT
int rcu_read_lock_sched_held(void);
-#else /* #ifdef CONFIG_PREEMPT_COUNT */
-static inline int rcu_read_lock_sched_held(void)
-{
- return 1;
-}
-#endif /* #else #ifdef CONFIG_PREEMPT_COUNT */
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
@@ -532,18 +525,10 @@ static inline int rcu_read_lock_bh_held(void)
return 1;
}
-#ifdef CONFIG_PREEMPT_COUNT
static inline int rcu_read_lock_sched_held(void)
{
- return preempt_count() != 0 || irqs_disabled();
-}
-#else /* #ifdef CONFIG_PREEMPT_COUNT */
-static inline int rcu_read_lock_sched_held(void)
-{
- return 1;
+ return !preemptible();
}
-#endif /* #else #ifdef CONFIG_PREEMPT_COUNT */
-
#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
#ifdef CONFIG_PROVE_RCU
@@ -1144,4 +1129,17 @@ static inline void rcu_sysidle_force_exit(void)
#endif /* #else #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */
+/*
+ * Dump the ftrace buffer, but only one time per callsite per boot.
+ */
+#define rcu_ftrace_dump(oops_dump_mode) \
+do { \
+ static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \
+ \
+ if (!atomic_read(&___rfd_beenhere) && \
+ !atomic_xchg(&___rfd_beenhere, 1)) \
+ ftrace_dump(oops_dump_mode); \
+} while (0)
+
+
#endif /* __LINUX_RCUPDATE_H */