rcu: Reduce overhead of cond_resched() checks for RCU

[firefly-linux-kernel-4.4.55.git] / kernel / rcu / update.c

diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index a2aeb4df0f603e9ebf2b3a19d764291a3965d3e0..bc78835705302a8fb3602826189e83cfb98894b7 100644 (file)
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -200,12 +200,12 @@ void wait_rcu_gp(call_rcu_func_t crf)
 EXPORT_SYMBOL_GPL(wait_rcu_gp);
 
 #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
-static inline void debug_init_rcu_head(struct rcu_head *head)
+void init_rcu_head(struct rcu_head *head)
 {
        debug_object_init(head, &rcuhead_debug_descr);
 }
 
-static inline void debug_rcu_head_free(struct rcu_head *head)
+void destroy_rcu_head(struct rcu_head *head)
 {
        debug_object_free(head, &rcuhead_debug_descr);
 }
@@ -350,21 +350,3 @@ static int __init check_cpu_stall_init(void)
 early_initcall(check_cpu_stall_init);
 
 #endif /* #ifdef CONFIG_RCU_STALL_COMMON */
-
-/*
- * Hooks for cond_resched() and friends to avoid RCU CPU stall warnings.
- */
-
-DEFINE_PER_CPU(int, rcu_cond_resched_count);
-
-/*
- * Report a set of RCU quiescent states, for use by cond_resched()
- * and friends.  Out of line due to being called infrequently.
- */
-void rcu_resched(void)
-{
-       preempt_disable();
-       __this_cpu_write(rcu_cond_resched_count, 0);
-       rcu_note_context_switch(smp_processor_id());
-       preempt_enable();
-}